[Libunwind-devel] [PATCH 4/7] ppc32: ppc64: test altivec support by running the compiler.

[Cody P Schafer]

---
 configure.in | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/configure.in b/configure.in
index 917a2c9..e655322 100644
--- a/configure.in
+++ b/configure.in
@@ -73,17 +73,14 @@ AC_CHECK_FUNCS(dl_iterate_phdr dl_phdr_removals_counter 
dlmodinfo getunwind \
                ttrace mincore)
 
 
-is_gcc_altivec() {
- if test `echo $CFLAGS | grep "\-maltivec" -c` -eq 1 ; then echo has_altivec;
- else
-  if test `echo $CC | grep "\-maltivec" -c` -eq 1 ; then echo has_altivec; 
else echo no_altivec; fi;
- fi;
-}
-
 AC_MSG_CHECKING([if building with AltiVec])
-use_altivec=`is_gcc_altivec`
-AM_CONDITIONAL(USE_ALTIVEC, test x$use_altivec = xhas_altivec)
-if test x$use_altivec = xhas_altivec; then
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#ifndef __ALTIVEC__
+# error choke
+#endif
+]])], [use_altivec=true],[use_altivec=false])
+AM_CONDITIONAL(USE_ALTIVEC, $use_altivec)
+if $use_altivec; then
   AC_MSG_RESULT([yes])
 else
   AC_MSG_RESULT([no])
-- 
1.7.11.3