glibc/sysdeps/x86_64/configure.in

GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/x86_64.

AC_CHECK_HEADER([cpuid.h], ,
  [AC_MSG_ERROR([gcc must provide the <cpuid.h> header])],
  [/* No default includes.  */])

dnl Check if -msse4 works.
AC_CACHE_CHECK(for SSE4 support, libc_cv_cc_sse4, [dnl
LIBC_TRY_CC_OPTION([-msse4], [libc_cv_cc_sse4=yes], [libc_cv_cc_sse4=no])
])
if test $libc_cv_cc_sse4 = yes; then
  AC_DEFINE(HAVE_SSE4_SUPPORT)
fi

dnl Check if -mavx works.
AC_CACHE_CHECK(for AVX support, libc_cv_cc_avx, [dnl
LIBC_TRY_CC_OPTION([-mavx], [libc_cv_cc_avx=yes], [libc_cv_cc_avx=no])
])
if test $libc_cv_cc_avx = yes; then
  AC_DEFINE(HAVE_AVX_SUPPORT)
fi

dnl Check if -msse2avx works.
AC_CACHE_CHECK(for AVX encoding of SSE instructions, libc_cv_cc_sse2avx, [dnl
LIBC_TRY_CC_OPTION([-msse2avx],
		   [libc_cv_cc_sse2avx=yes],
		   [libc_cv_cc_sse2avx=no])
])
if test $libc_cv_cc_sse2avx = yes; then
  AC_DEFINE(HAVE_SSE2AVX_SUPPORT)
fi

dnl Check if -mfma4 works.
AC_CACHE_CHECK(for FMA4 support, libc_cv_cc_fma4, [dnl
LIBC_TRY_CC_OPTION([-mfma4], [libc_cv_cc_fma4=yes], [libc_cv_cc_fma4=no])
])
if test $libc_cv_cc_fma4 = yes; then
  AC_DEFINE(HAVE_FMA4_SUPPORT)
fi

dnl Check if -mno-vzeroupper works.
AC_CACHE_CHECK(for -mno-vzeroupper support, libc_cv_cc_novzeroupper, [dnl
LIBC_TRY_CC_OPTION([-mno-vzeroupper],
		   [libc_cv_cc_novzeroupper=yes],
		   [libc_cv_cc_novzeroupper=no])
])

dnl It is always possible to access static and hidden symbols in an
dnl position independent way.
AC_DEFINE(PI_STATIC_AND_HIDDEN)
# work around problem with autoconf and empty lines at the end of files