From: Søren Sandmann Pedersen <s...@redhat.com>
Clang 3.0 chokes on the following bit of assembly
asm ("pmulhuw %1, %0\n\t"
: "+y" (__A)
: "y" (__B)
);
from pixman-mmx.c with this error message:
fatal error: error in backend: Unsupported asm: input constraint
with a matching output constraint of incompatible type!
So add a check in configure to only enable MMX when the compiler can
deal with it.
---
configure.ac | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/configure.ac b/configure.ac
index 2dd4776..59e31c4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -355,6 +355,12 @@ int main () {
: "y" (v), "K" (5)
);
+ /* Some versions of clang will choke on this */
+ asm ("pmulhuw %1, %0\n\t"
+ : "+y" (w)
+ : "y" (v)
+ );
+
return _mm_cvtsi64_si32 (v);
}]])], have_mmx_intrinsics=yes)
CFLAGS=$xserver_save_CFLAGS
--
1.7.11.7
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