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| author | redi <redi@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-09 17:20:42 +0000 |
|---|---|---|
| committer | redi <redi@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-09 17:20:42 +0000 |
| commit | bdbf421cd2aa91716fab7fa7b6a312ab5a576212 (patch) | |
| tree | 8969affc89fdebd06b8f119befc16b15679f6256 /libstdc++-v3/acinclude.m4 | |
| parent | 865812bf75d27473d32386711289e7a14832da31 (diff) | |
| download | ppe42-gcc-bdbf421cd2aa91716fab7fa7b6a312ab5a576212.tar.gz ppe42-gcc-bdbf421cd2aa91716fab7fa7b6a312ab5a576212.zip | |
2012-09-09 Ulrich Drepper <drepper@gmail.com>
Dominique d'Humieres <dominiq@lps.ens.fr>
Jack Howarth <howarth@bromo.med.uc.edu>
PR bootstrap/54419
* acinclude.m4: Define GLIBCXX_CHECK_X86_RDRAND.
* configure.ac: Use GLIBCXX_CHECK_X86_RDRAND to test for rdrand
support in assembler.
* src/c++11/random.cc (__x86_rdrand): Depend on _GLIBCXX_X86_RDRAND.
(random_device::_M_init): Likewise.
(random_device::_M_getval): Likewise.
* configure: Regenerated.
* config.h.in: Regenerated.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191111 138bc75d-0d04-0410-961f-82ee72b054a4
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 1179407bf55..267302df660 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], [ |
