********************************************************************************
conan install backward-cpp/1.6@ --build=backward-cpp --profile=/home/conan/w/BuildSingleReference/30712/c907b073-df05-4f40-a7a4-14a5047edf18/profile.txt
********************************************************************************
Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Debug
compiler=gcc
compiler.libcxx=libstdc++
compiler.version=4.9
os=Linux
os_build=Linux
[options]
backward-cpp:shared=True
[build_requires]
[env]

backward-cpp/1.6: Forced build from source
Installing package: backward-cpp/1.6
Requirements
    backward-cpp/1.6 from local cache - Cache
    libdwarf/20191104 from 'conan-center' - Cache
    libelf/0.8.13 from 'conan-center' - Cache
    zlib/1.2.11 from 'conan-center' - Cache
Packages
    backward-cpp/1.6:5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b - Build
    libdwarf/20191104:a3f3ecedb51a8d24e657c68748a3243c5ba030e4 - Cache
    libelf/0.8.13:2345d377da94e8ffae1333469573b8215c98c514 - Cache
    zlib/1.2.11:2345d377da94e8ffae1333469573b8215c98c514 - Cache

Installing (downloading, building) binaries...
libelf/0.8.13: Already installed!
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
[HOOK - conan-center.py] post_package_info(): [LIBRARY DOES NOT EXIST (KB-H054)] OK
zlib/1.2.11: Already installed!
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
[HOOK - conan-center.py] post_package_info(): [LIBRARY DOES NOT EXIST (KB-H054)] OK
libdwarf/20191104: Already installed!
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
[HOOK - conan-center.py] post_package_info(): [LIBRARY DOES NOT EXIST (KB-H054)] OK
backward-cpp/1.6: Copying sources to build folder
backward-cpp/1.6: Building your package in /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b
backward-cpp/1.6: Generator cmake created conanbuildinfo.cmake
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] 'fPIC' option not found
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK
backward-cpp/1.6: Calling build()

----Running------
> cd '/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/build_subfolder' && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Debug" -DCONAN_IN_LOCAL_CACHE="ON" -DCONAN_COMPILER="gcc" -DCONAN_COMPILER_VERSION="4.9" -DCONAN_CXX_FLAGS="-m64" -DCONAN_SHARED_LINKER_FLAGS="-m64" -DCONAN_C_FLAGS="-m64" -DCONAN_LIBCXX="libstdc++" -DBUILD_SHARED_LIBS="ON" -DCMAKE_INSTALL_PREFIX="/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/package/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b" -DCMAKE_INSTALL_BINDIR="bin" -DCMAKE_INSTALL_SBINDIR="bin" -DCMAKE_INSTALL_LIBEXECDIR="bin" -DCMAKE_INSTALL_LIBDIR="lib" -DCMAKE_INSTALL_INCLUDEDIR="include" -DCMAKE_INSTALL_OLDINCLUDEDIR="include" -DCMAKE_INSTALL_DATAROOTDIR="share" -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY="ON" -DCONAN_EXPORTED="1" -DSTACK_WALKING_UNWIND="True" -DSTACK_WALKING_BACKTRACE="False" -DSTACK_DETAILS_AUTO_DETECT="False" -DSTACK_DETAILS_BACKTRACE_SYMBOL="False" -DSTACK_DETAILS_DW="False" -DSTACK_DETAILS_BFD="False" -DSTACK_DETAILS_DWARF="True" -DBACKWARD_SHARED="True" -DBACKWARD_TESTS="False" -Wno-dev '/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b'
-----------------
-- The C compiler identification is GNU 4.9.4
-- The CXX compiler identification is GNU 4.9.4
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Conan: called by CMake conan helper
-- Conan: called inside local cache
-- Conan: Adjusting output directories
-- Conan: Using cmake global configuration
-- Conan: Adjusting default RPATHs Conan policies
-- Conan: Adjusting language standard
-- Conan: Checking correct version: 4.9
-- Conan: C++ stdlib: libstdc++
-- Found Backward: /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder  
-- Configuring done
-- Generating done
-- Build files have been written to: /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/build_subfolder

----Running------
> cmake --build '/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/build_subfolder' '--' '-j3'
-----------------
Scanning dependencies of target backward_object
Scanning dependencies of target backward
[ 66%] Building CXX object source_subfolder/CMakeFiles/backward_object.dir/backward.cpp.o
[ 66%] Building CXX object source_subfolder/CMakeFiles/backward.dir/backward.cpp.o
backward-cpp/1.6: 
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


In file included from /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:248:0,
                 from /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.cpp:36:
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:74:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef unsigned long long Dwarf_Unsigned;
                       ^
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:75:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef signed   long long Dwarf_Signed;
                       ^
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:76:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef unsigned long long Dwarf_Off;
                       ^
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:77:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef unsigned long long Dwarf_Addr;
                       ^
In file included from /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:248:0,
                 from /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.cpp:36:
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:74:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef unsigned long long Dwarf_Unsigned;
                       ^
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:75:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef signed   long long Dwarf_Signed;
                       ^
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:76:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef unsigned long long Dwarf_Off;
                       ^
/home/conan/w/BuildSingleReference/.conan/data/libdwarf/20191104/_/_/package/a3f3ecedb51a8d24e657c68748a3243c5ba030e4/include/libdwarf.h:77:23: warning: ISO C++ 1998 does not support 'long long' [-Wlong-long]
 typedef unsigned long long Dwarf_Addr;
                       ^
In file included from /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.cpp:36:0:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:521:7: error: template argument 3 is invalid
 class handle {
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:521:14: error: expected '>' before '{' token
 class handle {
              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:521:14: error: expected unqualified-id before '{' token
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:604:2: warning: extra ';' [-Wpedantic]
 };
  ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:628:12: error: 'handle' in namespace 'backward::details' does not name a template type
   details::handle<char *> _demangle_buffer;
            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'std::string backward::details::demangler_impl<backward::system_tag::linux_tag>::demangle(const char*)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:618:50: error: '_demangle_buffer' was not declared in this scope
     char *result = abi::__cxa_demangle(funcname, _demangle_buffer.get(),
                                                  ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: At global scope:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2248:20: error: 'handle' in namespace 'backward::details' does not name a template type
   typedef details::handle<int, details::deleter<int, int, &::close>>
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2251:20: error: 'handle' in namespace 'backward::details' does not name a template type
   typedef details::handle<Elf *, details::deleter<int, Elf *, &elf_end>>
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2254:20: error: 'handle' in namespace 'backward::details' does not name a template type
   typedef details::handle<Dwarf_Debug,
                    ^
In file included from /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.cpp:36:0:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:521:7: error: template argument 3 is invalid
 class handle {
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:521:14: error: expected '>' before '{' token
 class handle {
              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:521:14: error: expected unqualified-id before '{' token
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:604:2: warning: extra ';' [-Wpedantic]
 };
  ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:628:12: error: 'handle' in namespace 'backward::details' does not name a template type
   details::handle<char *> _demangle_buffer;
            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'std::string backward::details::demangler_impl<backward::system_tag::linux_tag>::demangle(const char*)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:618:50: error: '_demangle_buffer' was not declared in this scope
     char *result = abi::__cxa_demangle(funcname, _demangle_buffer.get(),
                                                  ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2288:5: error: 'dwarf_file_t' does not name a type
     dwarf_file_t file_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2289:5: error: 'dwarf_elf_t' does not name a type
     dwarf_elf_t elf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2290:5: error: 'dwarf_handle_t' does not name a type
     dwarf_handle_t dwarf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: At global scope:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2248:20: error: 'handle' in namespace 'backward::details' does not name a template type
   typedef details::handle<int, details::deleter<int, int, &::close>>
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2251:20: error: 'handle' in namespace 'backward::details' does not name a template type
   typedef details::handle<Elf *, details::deleter<int, Elf *, &elf_end>>
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2254:20: error: 'handle' in namespace 'backward::details' does not name a template type
   typedef details::handle<Dwarf_Debug,
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'virtual backward::ResolvedTrace backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::resolve(backward::ResolvedTrace)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2150:15: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     if (!fobj.dwarf_handle) {
               ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2215:26: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
       dwarf_dealloc(fobj.dwarf_handle.get(), filename, DW_DLA_STRING);
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2235:24: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     dwarf_dealloc(fobj.dwarf_handle.get(), die, DW_DLA_DIE);
                        ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject& backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::load_object_with_dwarf(const string&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2325:5: error: 'dwarf_file_t' was not declared in this scope
     dwarf_file_t file_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2326:16: error: expected unqualified-id before '.' token
     file_handle.reset(open(filename_object.c_str(), O_RDONLY));
                ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2327:20: error: expected primary-expression before '.' token
     if (file_handle.get() < 0) {
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2334:5: error: 'dwarf_elf_t' was not declared in this scope
     dwarf_elf_t elf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2335:5: error: 'elf_handle' was not declared in this scope
     elf_handle.reset(elf_begin(file_handle.get(), ELF_C_READ, NULL));
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2335:43: error: expected primary-expression before '.' token
     elf_handle.reset(elf_begin(file_handle.get(), ELF_C_READ, NULL));
                                           ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2288:5: error: 'dwarf_file_t' does not name a type
     dwarf_file_t file_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2289:5: error: 'dwarf_elf_t' does not name a type
     dwarf_elf_t elf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2290:5: error: 'dwarf_handle_t' does not name a type
     dwarf_handle_t dwarf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2437:20: error: expected ';' before 'debuglink_file'
       dwarf_file_t debuglink_file;
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2438:7: error: 'debuglink_file' was not declared in this scope
       debuglink_file.reset(open(debuglink.c_str(), O_RDONLY));
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2440:21: error: expected ';' before 'debuglink_elf'
         dwarf_elf_t debuglink_elf;
                     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2441:9: error: 'debuglink_elf' was not declared in this scope
         debuglink_elf.reset(elf_begin(debuglink_file.get(), ELF_C_READ, NULL));
         ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2446:42: error: 'move' was not declared in this scope
           elf_handle = move(debuglink_elf);
                                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2446:42: note: suggested alternative:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:431:26: note:   'backward::details::move'
 template <typename T> T &move(T &v) { return v; }
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2447:23: error: expected unqualified-id before '=' token
           file_handle = move(debuglink_file);
                       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2455:5: error: 'dwarf_handle_t' was not declared in this scope
     dwarf_handle_t dwarf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2467:5: error: 'dwarf_handle' was not declared in this scope
     dwarf_handle.reset(dwarf_debug);
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:7: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'file_handle'
     r.file_handle = move(file_handle);
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:37: error: expected primary-expression before ')' token
     r.file_handle = move(file_handle);
                                     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:37: error: 'move' was not declared in this scope
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:37: note: suggested alternative:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:431:26: note:   'backward::details::move'
 template <typename T> T &move(T &v) { return v; }
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2470:7: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'elf_handle'
     r.elf_handle = move(elf_handle);
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2471:7: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     r.dwarf_handle = move(dwarf_handle);
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::die_cache_entry& backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::get_die_cache(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2540:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::get_spec_die(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2641:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2660:36: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     return get_referenced_die(fobj.dwarf_handle.get(), die,
                                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static bool backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::die_has_pc(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, Dwarf_Addr)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2669:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static void backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::set_parameter_string(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::type_context_t&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2862:28: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
         dwarf_dealloc(fobj.dwarf_handle.get(), name, DW_DLA_STRING);
                            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2892:44: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
                 get_type_by_signature(fobj.dwarf_handle.get(), die);
                                            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2950:33: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
         get_referenced_die(fobj.dwarf_handle.get(), die, DW_AT_type, true);
                                 ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2953:26: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
       dwarf_dealloc(fobj.dwarf_handle.get(), ref, DW_DLA_DIE);
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static void backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::set_function_parameters(std::string&, std::vector<std::basic_string<char> >&, backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2966:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'void backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::inliners_search_cb::operator()(Dwarf_Die, std::vector<std::basic_string<char> >&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3067:32: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
       Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                                ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'virtual backward::ResolvedTrace backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::resolve(backward::ResolvedTrace)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2150:15: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     if (!fobj.dwarf_handle) {
               ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::find_fundie_by_pc(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, Dwarf_Addr, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3174:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2215:26: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
       dwarf_dealloc(fobj.dwarf_handle.get(), filename, DW_DLA_STRING);
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static bool backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::deep_first_search_by_pc(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, Dwarf_Addr, std::vector<std::basic_string<char> >&, CB)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3238:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2235:24: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     dwarf_dealloc(fobj.dwarf_handle.get(), die, DW_DLA_DIE);
                        ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::find_die(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Addr)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3360:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject& backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::load_object_with_dwarf(const string&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2325:5: error: 'dwarf_file_t' was not declared in this scope
     dwarf_file_t file_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2326:16: error: expected unqualified-id before '.' token
     file_handle.reset(open(filename_object.c_str(), O_RDONLY));
                ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2327:20: error: expected primary-expression before '.' token
     if (file_handle.get() < 0) {
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2334:5: error: 'dwarf_elf_t' was not declared in this scope
     dwarf_elf_t elf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2335:5: error: 'elf_handle' was not declared in this scope
     elf_handle.reset(elf_begin(file_handle.get(), ELF_C_READ, NULL));
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2335:43: error: expected primary-expression before '.' token
     elf_handle.reset(elf_begin(file_handle.get(), ELF_C_READ, NULL));
                                           ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: At global scope:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3689:54: error: '>>' should be '> >' within a nested template argument list
   typedef std::vector<std::pair<unsigned, std::string>> lines_t;
                                                      ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2437:20: error: expected ';' before 'debuglink_file'
       dwarf_file_t debuglink_file;
                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2438:7: error: 'debuglink_file' was not declared in this scope
       debuglink_file.reset(open(debuglink.c_str(), O_RDONLY));
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2440:21: error: expected ';' before 'debuglink_elf'
         dwarf_elf_t debuglink_elf;
                     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2441:9: error: 'debuglink_elf' was not declared in this scope
         debuglink_elf.reset(elf_begin(debuglink_file.get(), ELF_C_READ, NULL));
         ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2446:42: error: 'move' was not declared in this scope
           elf_handle = move(debuglink_elf);
                                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2446:42: note: suggested alternative:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:431:26: note:   'backward::details::move'
 template <typename T> T &move(T &v) { return v; }
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2447:23: error: expected unqualified-id before '=' token
           file_handle = move(debuglink_file);
                       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2455:5: error: 'dwarf_handle_t' was not declared in this scope
     dwarf_handle_t dwarf_handle;
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2467:5: error: 'dwarf_handle' was not declared in this scope
     dwarf_handle.reset(dwarf_debug);
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:7: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'file_handle'
     r.file_handle = move(file_handle);
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:37: error: expected primary-expression before ')' token
     r.file_handle = move(file_handle);
                                     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:37: error: 'move' was not declared in this scope
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2469:37: note: suggested alternative:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:431:26: note:   'backward::details::move'
 template <typename T> T &move(T &v) { return v; }
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2470:7: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'elf_handle'
     r.elf_handle = move(elf_handle);
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2471:7: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     r.dwarf_handle = move(dwarf_handle);
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3801:12: error: 'handle' in namespace 'backward::details' does not name a template type
   details::handle<std::ifstream *, details::default_delete<std::ifstream *>>
            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In constructor 'backward::SourceFile::SourceFile(const string&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3700:7: error: '_file' was not declared in this scope
       _file.reset(new std::ifstream(new_path.c_str()));
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3705:10: error: '_file' was not declared in this scope
     if (!_file || !is_open()) {
          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::die_cache_entry& backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::get_die_cache(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2540:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'bool backward::SourceFile::is_open() const':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3709:33: error: '_file' was not declared in this scope
   bool is_open() const { return _file->is_open(); }
                                 ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'backward::SourceFile::lines_t& backward::SourceFile::get_lines(unsigned int, unsigned int, backward::SourceFile::lines_t&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3722:5: error: '_file' was not declared in this scope
     _file->clear();
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::get_spec_die(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2641:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2660:36: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     return get_referenced_die(fobj.dwarf_handle.get(), die,
                                    ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static bool backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::die_has_pc(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, Dwarf_Addr)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2669:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'void backward::SourceFile::swap(backward::SourceFile&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3780:30: error: '_file' was not declared in this scope
   void swap(SourceFile &b) { _file.swap(b._file); }
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3780:43: error: 'class backward::SourceFile' has no member named '_file'
   void swap(SourceFile &b) { _file.swap(b._file); }
                                           ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static void backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::set_parameter_string(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::type_context_t&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2862:28: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
         dwarf_dealloc(fobj.dwarf_handle.get(), name, DW_DLA_STRING);
                            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2892:44: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
                 get_type_by_signature(fobj.dwarf_handle.get(), die);
                                            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2950:33: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
         get_referenced_die(fobj.dwarf_handle.get(), die, DW_AT_type, true);
                                 ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2953:26: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
       dwarf_dealloc(fobj.dwarf_handle.get(), ref, DW_DLA_DIE);
                          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static void backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::set_function_parameters(std::string&, std::vector<std::basic_string<char> >&, backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2966:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'void backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::inliners_search_cb::operator()(Dwarf_Die, std::vector<std::basic_string<char> >&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3067:32: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
       Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                                ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::find_fundie_by_pc(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, Dwarf_Addr, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3174:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static bool backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::deep_first_search_by_pc(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die, Dwarf_Addr, std::vector<std::basic_string<char> >&, CB)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3238:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::find_die(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Addr)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3360:30: error: 'struct backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject' has no member named 'dwarf_handle'
     Dwarf_Debug dwarf = fobj.dwarf_handle.get();
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: At global scope:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3689:54: error: '>>' should be '> >' within a nested template argument list
   typedef std::vector<std::pair<unsigned, std::string>> lines_t;
                                                      ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3801:12: error: 'handle' in namespace 'backward::details' does not name a template type
   details::handle<std::ifstream *, details::default_delete<std::ifstream *>>
            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In constructor 'backward::SourceFile::SourceFile(const string&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3700:7: error: '_file' was not declared in this scope
       _file.reset(new std::ifstream(new_path.c_str()));
       ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3705:10: error: '_file' was not declared in this scope
     if (!_file || !is_open()) {
          ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'bool backward::SourceFile::is_open() const':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3709:33: error: '_file' was not declared in this scope
   bool is_open() const { return _file->is_open(); }
                                 ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'backward::SourceFile::lines_t& backward::SourceFile::get_lines(unsigned int, unsigned int, backward::SourceFile::lines_t&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3722:5: error: '_file' was not declared in this scope
     _file->clear();
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: At global scope:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:4256:12: error: 'handle' in namespace 'backward::details' does not name a template type
   details::handle<char *> _stack_content;
            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'void backward::SourceFile::swap(backward::SourceFile&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3780:30: error: '_file' was not declared in this scope
   void swap(SourceFile &b) { _file.swap(b._file); }
                              ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3780:43: error: 'class backward::SourceFile' has no member named '_file'
   void swap(SourceFile &b) { _file.swap(b._file); }
                                           ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In constructor 'backward::SignalHandling::SignalHandling(const std::vector<int>&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:4164:5: error: '_stack_content' was not declared in this scope
     _stack_content.reset(static_cast<char *>(malloc(stack_size)));
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: At global scope:
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:4256:12: error: 'handle' in namespace 'backward::details' does not name a template type
   details::handle<char *> _stack_content;
            ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In constructor 'backward::SignalHandling::SignalHandling(const std::vector<int>&)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:4164:5: error: '_stack_content' was not declared in this scope
     _stack_content.reset(static_cast<char *>(malloc(stack_size)));
     ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::get_spec_die(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2662:3: warning: control reaches end of non-void function [-Wreturn-type]
   }
   ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In static member function 'static Dwarf_Die_s* backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::get_spec_die(backward::TraceResolverLinuxImpl<backward::trace_resolver_tag::libdwarf>::dwarf_fileobject&, Dwarf_Die)':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:2662:3: warning: control reaches end of non-void function [-Wreturn-type]
   }
   ^
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'bool backward::SourceFile::is_open() const':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3709:51: warning: control reaches end of non-void function [-Wreturn-type]
   bool is_open() const { return _file->is_open(); }
                                                   ^
make[2]: *** [source_subfolder/CMakeFiles/backward.dir/backward.cpp.o] Error 1
make[1]: *** [source_subfolder/CMakeFiles/backward.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp: In member function 'bool backward::SourceFile::is_open() const':
/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/source_subfolder/backward.hpp:3709:51: warning: control reaches end of non-void function [-Wreturn-type]
   bool is_open() const { return _file->is_open(); }
                                                   ^
make[2]: *** [source_subfolder/CMakeFiles/backward_object.dir/backward.cpp.o] Error 1
make[1]: *** [source_subfolder/CMakeFiles/backward_object.dir/all] Error 2
make: *** [all] Error 2
backward-cpp/1.6: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b
backward-cpp/1.6: ERROR: Package '5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b' build failed
backward-cpp/1.6: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b
ERROR: backward-cpp/1.6: Error in build() method, line 133
	cmake.build()
	ConanException: Error 2 while executing cmake --build '/home/conan/w/BuildSingleReference/.conan/data/backward-cpp/1.6/_/_/build/5c0539d75ccbaf4bdf6a253fced6a58ff074ff2b/build_subfolder' '--' '-j3'