fixes for PIC code on x86-64 patch by (Drew Hess <drew.hess gmail com>)

Originally committed as revision 3757 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/common.h

@@ -224,12 +224,21 @@ static inline float floorf(float f) {
 
 #    include "bswap.h"
 
+// Use rip-relative addressing if compiling PIC code on x86-64.
 #    if defined(__MINGW32__) || defined(__CYGWIN__) || \
         defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
+#        if defined(ARCH_X86_64) && defined(PIC)
+#            define MANGLE(a) "_" #a"(%%rip)"
+#        else
 #            define MANGLE(a) "_" #a
+#        endif
+#    else
+#        if defined(ARCH_X86_64) && defined(PIC)
+#            define MANGLE(a) #a"(%%rip)"
 #        else
 #            define MANGLE(a) #a
 #        endif
+#    endif
 
 /* debug stuff */
 

libavcodec/libpostproc/mangle.h

@@ -8,12 +8,21 @@
 #define __MANGLE_H
 
 /* Feel free to add more to the list, eg. a.out IMO */
+/* Use rip-relative addressing if compiling PIC code on x86-64. */
 #if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__OS2__) || \
    (defined(__OpenBSD__) && !defined(__ELF__))
+#if defined(ARCH_X86_64) && defined(PIC)
+#define MANGLE(a) "_" #a"(%%rip)"
+#else
 #define MANGLE(a) "_" #a
+#endif
+#else
+#if defined(ARCH_X86_64) && defined(PIC)
+#define MANGLE(a) #a"(%%rip)"
 #else
 #define MANGLE(a) #a
 #endif
+#endif
 
 #endif /* !__MANGLE_H */