From: Søren Sandmann Pedersen <[email protected]>
There are several issues with the Clang compiler and pixman-mmx.c:
- When not optimizing, it doesn't seem to recognize that an argument
to an __always_inline__ function is compile-time constant. This
results in this error being produced:
fatal error: error in backend: Invalid operand for inline asm
constraint 'K'!
- This inline assembly:
asm ("pmulhuw %1, %0\n\t"
: "+y" (__A)
: "y" (__B)
);
results in
fatal error: error in backend: Unsupported asm: input constraint
with a matching output constraint of incompatible type!
So disable MMX when the compiler is Clang.
---
configure.ac | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/configure.ac b/configure.ac
index f39f437..cca4d16 100644
--- a/configure.ac
+++ b/configure.ac
@@ -294,6 +294,9 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#if defined(__GNUC__) && (__GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ <
4))
#error "Need GCC >= 3.4 for MMX intrinsics"
#endif
+#if defined(__clang__)
+#error "clang chokes on the inline assembly in pixman-mmx.c"
+#endif
#include <mmintrin.h>
int main () {
__m64 v = _mm_cvtsi32_si64 (1);
--
1.7.4
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