WARNHarfBuzz has a Meson port and tries to migrate all the other build systems to it, please consider using it as we might remove our cmake port soon.
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY
    HB_BUILD_TESTS


In file included from hb-ot-shape-complex-use-machine.rl:33:0,
                 from /home/conan/w/cci_PR-4005/.conan/data/harfbuzz/2.7.4/_/_/build/07cf6fd78232bb2a047aa0d4a53afa3bb4b9689d/source_subfolder/src/hb-ot-shape-complex-use.cc:202,
                 from /home/conan/w/cci_PR-4005/.conan/data/harfbuzz/2.7.4/_/_/build/07cf6fd78232bb2a047aa0d4a53afa3bb4b9689d/source_subfolder/src/harfbuzz.cc:34:
/home/conan/w/cci_PR-4005/.conan/data/harfbuzz/2.7.4/_/_/build/07cf6fd78232bb2a047aa0d4a53afa3bb4b9689d/source_subfolder/src/hb-ot-shape-complex-machine-index.hh: In instantiation of 'machine_index_t<Iter>::machine_index_t(const machine_index_t<Iter>&) [with Iter = hb_zip_iter_t<hb_iota_iter_t<unsigned int, unsigned int>, hb_filter_iter_t<hb_filter_iter_t<hb_zip_iter_t<hb_iota_iter_t<unsigned int, unsigned int>, hb_array_t<hb_glyph_info_t> >, find_syllables_use(hb_buffer_t*)::<lambda(const hb_glyph_info_t&)>, const<anonymous struct>&, 0u>, find_syllables_use(hb_buffer_t*)::<lambda(hb_pair_t<unsigned int, const hb_glyph_info_t&>)>, const<anonymous struct>&, 0u> >]':
hb-ot-shape-complex-use-machine.rl:187:7:   required from here
/home/conan/w/cci_PR-4005/.conan/data/harfbuzz/2.7.4/_/_/build/07cf6fd78232bb2a047aa0d4a53afa3bb4b9689d/source_subfolder/src/hb-ot-shape-complex-machine-index.hh:37:3: warning: base class 'struct hb_iter_with_fallback_t<machine_index_t<hb_zip_iter_t<hb_iota_iter_t<unsigned int, unsigned int>, hb_filter_iter_t<hb_filter_iter_t<hb_zip_iter_t<hb_iota_iter_t<unsigned int, unsigned int>, hb_array_t<hb_glyph_info_t> >, find_syllables_use(hb_buffer_t*)::<lambda(const hb_glyph_info_t&)>, const<anonymous struct>&, 0u>, find_syllables_use(hb_buffer_t*)::<lambda(hb_pair_t<unsigned int, const hb_glyph_info_t&>)>, const<anonymous struct>&, 0u> > >, hb_pair_t<unsigned int, hb_pair_t<unsigned int, hb_glyph_info_t&> > >' should be explicitly initialized in the copy constructor [-Wextra]
   machine_index_t (const machine_index_t& o) : it (o.it) {}
   ^
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY