Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /var/tmp/portage/dev-util/apitrace-9.0-r1/work/apitrace-9.0_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_251df && [1/2] Building C object CMakeFiles/cmTC_251df.dir/src.c.o
[2/2] Linking C executable cmTC_251df
FAILED: cmTC_251df 
: && /usr/lib/llvm/10/bin/x86_64-pc-linux-gnu-clang -O2 -pipe -march=native -frecord-gcc-switches -fno-diagnostics-color -DCMAKE_HAVE_LIBC_PTHREAD -Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0 -fuse-ld=lld   -rdynamic CMakeFiles/cmTC_251df.dir/src.c.o -o cmTC_251df   && :
ld.lld: error: undefined symbol: pthread_create
>>> referenced by src.c
>>>               CMakeFiles/cmTC_251df.dir/src.c.o:(main)

ld.lld: error: undefined symbol: pthread_detach
>>> referenced by src.c
>>>               CMakeFiles/cmTC_251df.dir/src.c.o:(main)

ld.lld: error: undefined symbol: pthread_cancel
>>> referenced by src.c
>>>               CMakeFiles/cmTC_251df.dir/src.c.o:(main)

ld.lld: error: undefined symbol: pthread_join
>>> referenced by src.c
>>>               CMakeFiles/cmTC_251df.dir/src.c.o:(main)
clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.


Source file was:
#include <pthread.h>

void* test_func(void* data)
{
  return data;
}

int main(void)
{
  pthread_t thread;
  pthread_create(&thread, NULL, test_func, NULL);
  pthread_detach(thread);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  pthread_atfork(NULL, NULL, NULL);
  pthread_exit(NULL);

  return 0;
}

Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /var/tmp/portage/dev-util/apitrace-9.0-r1/work/apitrace-9.0_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_72108 && [1/2] Building C object CMakeFiles/cmTC_72108.dir/CheckFunctionExists.c.o
[2/2] Linking C executable cmTC_72108
FAILED: cmTC_72108 
: && /usr/lib/llvm/10/bin/x86_64-pc-linux-gnu-clang -O2 -pipe -march=native -frecord-gcc-switches -fno-diagnostics-color -DCHECK_FUNCTION_EXISTS=pthread_create -Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0 -fuse-ld=lld   -rdynamic CMakeFiles/cmTC_72108.dir/CheckFunctionExists.c.o -o cmTC_72108  -lpthreads && :
ld.lld: error: unable to find library -lpthreads
clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.



Determining if the function getexecname exists failed with the following output:
Change Dir: /var/tmp/portage/dev-util/apitrace-9.0-r1/work/apitrace-9.0_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_5405e && [1/2] Building C object CMakeFiles/cmTC_5405e.dir/CheckFunctionExists.c.o
[2/2] Linking C executable cmTC_5405e
FAILED: cmTC_5405e 
: && /usr/lib/llvm/10/bin/x86_64-pc-linux-gnu-clang -O2 -pipe -march=native -frecord-gcc-switches -fno-diagnostics-color -fvisibility=hidden -Wall -Wno-sign-compare -fno-strict-aliasing -fmessage-length=0 -fno-omit-frame-pointer -DCHECK_FUNCTION_EXISTS=getexecname -Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0 -fuse-ld=lld   -rdynamic CMakeFiles/cmTC_5405e.dir/CheckFunctionExists.c.o -o cmTC_5405e   && :
ld.lld: error: undefined symbol: getexecname
>>> referenced by CheckFunctionExists.c
>>>               CMakeFiles/cmTC_5405e.dir/CheckFunctionExists.c.o:(main)
clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.



Determining if the include file libdwarf/dwarf.h exists failed with the following output:
Change Dir: /var/tmp/portage/dev-util/apitrace-9.0-r1/work/apitrace-9.0_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_fd9aa && [1/2] Building C object CMakeFiles/cmTC_fd9aa.dir/CheckIncludeFile.c.o
FAILED: CMakeFiles/cmTC_fd9aa.dir/CheckIncludeFile.c.o 
/usr/lib/llvm/10/bin/x86_64-pc-linux-gnu-clang -D_GNU_SOURCE   -O2 -pipe -march=native -frecord-gcc-switches -fno-diagnostics-color -fvisibility=hidden -Wall -Wno-sign-compare -fno-strict-aliasing -fmessage-length=0 -fno-omit-frame-pointer -MD -MT CMakeFiles/cmTC_fd9aa.dir/CheckIncludeFile.c.o -MF CMakeFiles/cmTC_fd9aa.dir/CheckIncludeFile.c.o.d -o CMakeFiles/cmTC_fd9aa.dir/CheckIncludeFile.c.o -c CheckIncludeFile.c
CheckIncludeFile.c:1:10: fatal error: 'libdwarf/dwarf.h' file not found
#include <libdwarf/dwarf.h>
         ^~~~~~~~~~~~~~~~~~
1 error generated.
ninja: build stopped: subcommand failed.