diff options
Diffstat (limited to 'libstdc++-v3/acinclude.m4')
| -rw-r--r-- | libstdc++-v3/acinclude.m4 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4 index 1179407..267302d 100644 --- a/libstdc++-v3/acinclude.m4 +++ b/libstdc++-v3/acinclude.m4 @@ -3360,6 +3360,26 @@ AC_DEFUN([AC_LC_MESSAGES], [ ]) dnl +dnl Check whether rdrand is supported in the assembler. +AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [ + AC_MSG_CHECKING([for rdrand support in assembler]) + AC_CACHE_VAL($ac_cv_x86_rdrand, [ + ac_cv_x86_rdrand=no + case "$target" in + i?86-*-* | \ + x86_64-*-*) + AC_TRY_COMPILE(, [asm("rdrand %eax");], + [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no]) + esac + ]) + if test $ac_cv_x86_rdrand = yes; then + AC_DEFINE(_GLIBCXX_X86_RDRAND, 1, + [ Defined if as can handle rdrand. ]) + fi + AC_MSG_RESULT($ac_cv_x86_rdrand) +]) + +dnl dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS. dnl AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [ |