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-rw-r--r--unix/configure.in14
1 files changed, 14 insertions, 0 deletions
diff --git a/unix/configure.in b/unix/configure.in
index b3df242..b2cf87a 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -726,6 +726,20 @@ elif test $tcl_cv_stack_grows_up = yes; then
fi
#--------------------------------------------------------------------
+# 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.
#--------------------------------------------------------------------