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conan install llvm/12.0.1@ --build=llvm --profile=/home/conan/w/BuildSingleReference/27104/2cafae61-bb76-4c77-8bb0-3e65fd080f25/profile.txt
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Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++
compiler.version=4.9
os=Linux
os_build=Linux
[options]
[build_requires]
[env]

llvm/12.0.1: Forced build from source
Installing package: llvm/12.0.1
Requirements
    llvm/12.0.1 from local cache - Cache
Packages
    llvm/12.0.1:cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e - Build

Installing (downloading, building) binaries...
llvm/12.0.1: Building your package in /home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK. 'fPIC' option found and apparently well managed
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK
llvm/12.0.1: Calling build()
llvm/12.0.1: Enabled LLVM subprojects: clang, compiler-rt

----Running------
> cd '/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e' && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Release" -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++" -DCMAKE_INSTALL_PREFIX="/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/package/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e" -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" -DCONAN_CMAKE_POSITION_INDEPENDENT_CODE="ON" -DCMAKE_MODULE_PATH="/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e" -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY="ON" -DCONAN_EXPORTED="1" -Wno-dev -DLLVM_ENABLE_PROJECTS="clang;compiler-rt" -DLLVM_ENABLE_BINDINGS="False" '/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/source/source_subfolder/llvm'
-----------------
-- The C compiler identification is GNU 4.9.4
-- The CXX compiler identification is GNU 4.9.4
-- The ASM compiler identification is GNU
-- Found assembler: /usr/bin/gcc
-- 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
-- clang project is enabled
-- clang-tools-extra project is disabled
-- compiler-rt project is enabled
-- debuginfo-tests project is disabled
-- libc project is disabled
-- libclc project is disabled
-- libcxx project is disabled
-- libcxxabi project is disabled
-- libunwind project is disabled
-- lld project is disabled
-- lldb project is disabled
-- mlir project is disabled
-- openmp project is disabled
-- parallel-libs project is disabled
-- polly project is disabled
-- pstl project is disabled
-- flang project is disabled
-- Configuring incomplete, errors occurred!
See also "/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e/CMakeFiles/CMakeOutput.log".
llvm/12.0.1: 
CMake Error at cmake/modules/CheckCompilerVersion.cmake:38 (message):
  Host GCC version must be at least 5.1, your version is 4.9.4.
Call Stack (most recent call first):
  cmake/modules/CheckCompilerVersion.cmake:48 (check_compiler_version)
  cmake/config-ix.cmake:14 (include)
  CMakeLists.txt:670 (include)


llvm/12.0.1: WARN: Build folder is dirty, removing it: /home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e
llvm/12.0.1: ERROR: Package 'cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e' build failed
llvm/12.0.1: WARN: Build folder /home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e
ERROR: llvm/12.0.1: Error in build() method, line 85
	cmake = self._cmake_configure()
while calling '_cmake_configure', line 80
	source_folder = os.path.join(self._source_subfolder, 'llvm')
	ConanException: Error 1 while executing cd '/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e' && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Release" -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++" -DCMAKE_INSTALL_PREFIX="/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/package/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e" -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" -DCONAN_CMAKE_POSITION_INDEPENDENT_CODE="ON" -DCMAKE_MODULE_PATH="/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/build/cc8928f36ddbca8596bf4b85dddb4c0ec44efa3e" -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY="ON" -DCONAN_EXPORTED="1" -Wno-dev -DLLVM_ENABLE_PROJECTS="clang;compiler-rt" -DLLVM_ENABLE_BINDINGS="False" '/home/conan/w/BuildSingleReference/.conan/data/llvm/12.0.1/_/_/source/source_subfolder/llvm'