[Pixman] [PATCH 1/5] configure.ac: Fail the ARM/iwMMXt test if not compiling with -march=iwmmxt
Matt Turner
mattst88 at gmail.com
Fri May 18 11:41:50 PDT 2012
If not compiling with -march=iwmmxt, the configure test will still pass,
thinking that the __builtin_arm_* intrinsic is a function instead of
generating a single instruction. Since no linking is done, the configure
test doesn't catch this, and we get linking errors in the build.
---
configure.ac | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/configure.ac b/configure.ac
index 5ff78eb..027a168 100644
--- a/configure.ac
+++ b/configure.ac
@@ -619,6 +619,9 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#ifndef __arm__
#error "IWMMXT is only available on ARM"
#endif
+#ifndef __IWMMXT__
+#error "IWMMXT not enabled (with -march=iwmmxt)"
+#endif
#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 5))
#error "Need GCC >= 4.5 for IWMMXT intrinsics"
#endif
--
1.7.3.4
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