The system is: Linux - 5.5.8 - x86_64 Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded. Compiler: /usr/bin/x86_64-gentoo-linux-musl-gcc Build flags: -O2;-pipe;-march=native;-fno-common;-falign-functions=32:25:16 Id flags: The output was: 0 Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out" The C compiler identification is GNU, found in "/var/tmp/portage/media-libs/libebur128-1.2.4/work/libebur128-1.2.4-abi_x86_64.amd64/CMakeFiles/3.16.5/CompilerIdC/a.out" Determining if the C compiler works passed with the following output: Change Dir: /var/tmp/portage/media-libs/libebur128-1.2.4/work/libebur128-1.2.4-abi_x86_64.amd64/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/ninja cmTC_a832c && [1/2] Building C object CMakeFiles/cmTC_a832c.dir/testCCompiler.c.o [2/2] Linking C executable cmTC_a832c Detecting C compiler ABI info compiled with the following output: Change Dir: /var/tmp/portage/media-libs/libebur128-1.2.4/work/libebur128-1.2.4-abi_x86_64.amd64/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/ninja cmTC_5115b && [1/2] Building C object CMakeFiles/cmTC_5115b.dir/CMakeCCompilerABI.c.o Using built-in specs. 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GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/../../../../x86_64-gentoo-linux-musl/include" #include "..." search starts here: #include <...> search starts here: /usr/include /usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/include End of search list. GNU C17 (Gentoo 9.2.0-r4 p5) version 9.2.0 (x86_64-gentoo-linux-musl) compiled by GNU C version 9.2.0, GMP version 6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version none warning: GMP header version 6.1.2 differs from library version 6.2.0. GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU assembler version 2.34.0 (x86_64-gentoo-linux-musl) using BFD version (Gentoo 2.34 p1) 2.34.0 Compiler executable checksum: 1f13dd94373285db433b1ebba2442db8 COMPILER_PATH=/usr/libexec/gcc/x86_64-gentoo-linux-musl/9.2.0/:/usr/libexec/gcc/x86_64-gentoo-linux-musl/9.2.0/:/usr/libexec/gcc/x86_64-gentoo-linux-musl/:/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/:/usr/lib/gcc/x86_64-gentoo-linux-musl/:/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/../../../../x86_64-gentoo-linux-musl/bin/ LIBRARY_PATH=/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/:/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/../../../../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/../../../../x86_64-gentoo-linux-musl/lib/:/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-D' 'NDEBUG' '-O2' '-pipe' '-march=native' '-fno-common' '-falign-functions=32:25:16' '-v' '-o' 'CMakeFiles/cmTC_5115b.dir/CMakeCCompilerABI.c.o' '-c' [2/2] Linking C executable cmTC_5115b Using built-in specs. COLLECT_GCC=/usr/bin/x86_64-gentoo-linux-musl-gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-gentoo-linux-musl/9.2.0/lto-wrapper Target: x86_64-gentoo-linux-musl Configured with: /var/tmp/portage/sys-devel/gcc-9.2.0-r4/work/gcc-9.2.0/configure --host=x86_64-gentoo-linux-musl --build=x86_64-gentoo-linux-musl --prefix=/usr --bindir=/usr/x86_64-gentoo-linux-musl/gcc-bin/9.2.0 --includedir=/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/include --datadir=/usr/share/gcc-data/x86_64-gentoo-linux-musl/9.2.0 --mandir=/usr/share/gcc-data/x86_64-gentoo-linux-musl/9.2.0/man --infodir=/usr/share/gcc-data/x86_64-gentoo-linux-musl/9.2.0/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-gentoo-linux-musl/9.2.0/include/g++-v9 --with-python-dir=/share/gcc-data/x86_64-gentoo-linux-musl/9.2.0/python --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ 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