[Bug target/112777] [14 Regression] profiled bootstrap fails on powerpc-linux-gnu, undefined references to __atomic_fetch_add_8

[sebastian.huber--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112777

--- Comment #3 from Sebastian Huber <sebastian.hu...@embedded-brains.de> ---
I think the issue is in c-cppbuiltin.cc:

      builtin_define_with_int_value ("__LIBGCC_HAVE_LIBATOMIC",
                                     targetm.have_libatomic);

Which is used in libgcov.h like this:

/* Detect whether target can support atomic update of profilers.  */
#if (__SIZEOF_LONG_LONG__ == 4 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) \
    || (__SIZEOF_LONG_LONG__ == 8 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8) \
    || defined (__LIBGCC_HAVE_LIBATOMIC)
#define GCOV_SUPPORTS_ATOMIC 1
#else
#define GCOV_SUPPORTS_ATOMIC 0
#endif

Should I keep the defined (__LIBGCC_HAVE_LIBATOMIC) and change c-cppbuiltin.cc
to:

if (targetm.have_libatomic)
  builtin_define ("__LIBGCC_HAVE_LIBATOMIC");

Or, should I change libgcov.h to use:

#if (__SIZEOF_LONG_LONG__ == 4 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) \
    || (__SIZEOF_LONG_LONG__ == 8 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8) \
    || __LIBGCC_HAVE_LIBATOMIC