diff options
Diffstat (limited to 'unix/configure.in')
| -rw-r--r-- | unix/configure.in | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/unix/configure.in b/unix/configure.in index 745e1e3..29dc027 100644 --- a/unix/configure.in +++ b/unix/configure.in @@ -750,6 +750,20 @@ fi AC_MSG_RESULT([$tcl_ok]) #-------------------------------------------------------------------- +# The check below checks whether the cpuid instruction is usable. +#-------------------------------------------------------------------- + +AC_CACHE_CHECK([whether the cpuid instruction is usable], tcl_cv_cpuid, [ + AC_TRY_LINK(, [ + int index,ax,bx,cx,dx; + __asm__ __volatile__ ("cpuid":\ + "=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (index)); + ], tcl_cv_cpuid=yes, tcl_cv_cpuid=no)]) +if test $tcl_cv_cpuid = yes; then + AC_DEFINE(HAVE_CPUID) +fi + +#-------------------------------------------------------------------- # The statements below define a collection of symbols related to # building libtcl as a shared library instead of a static library. #-------------------------------------------------------------------- |