Mark code parts that cannot work on AMD64 due to broken relocations as such.

This allows building shared libraries on AMD64 again.
based on a patch by Diego 'Flameeyes' Pettenò and suggestions by Michael
original thread:
Date: Wed, 18 Apr 2007 11:26:12 +0200
Subject: [Ffmpeg-devel] [PATCH] (try 2) Build shared libraries on AMD64 again

Originally committed as revision 8849 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/cabac.h

@@ -376,7 +376,7 @@ static int av_always_inline get_cabac_inline(CABACContext *c, uint8_t * const st
 #define BYTE        "16"
 #define BYTEEND     "20"
 #endif
-#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE)
+#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS)
     int bit;
 
 #ifndef BRANCHLESS_CABAC_DECODER
@@ -532,7 +532,7 @@ static int av_always_inline get_cabac_inline(CABACContext *c, uint8_t * const st
     );
     bit&=1;
 #endif /* BRANCHLESS_CABAC_DECODER */
-#else /* defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) */
+#else /* defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */
     int s = *state;
     int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s];
     int bit, lps_mask attribute_unused;
@@ -571,7 +571,7 @@ static int av_always_inline get_cabac_inline(CABACContext *c, uint8_t * const st
     if(!(c->low & CABAC_MASK))
         refill2(c);
 #endif /* BRANCHLESS_CABAC_DECODER */
-#endif /* defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) */
+#endif /* defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */
     return bit;
 }
 
@@ -680,7 +680,7 @@ static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
 
 //FIXME the x86 code from this file should be moved into i386/h264 or cabac something.c/h (note ill kill you if you move my code away from under my fingers before iam finished with it!)
 //FIXME use some macros to avoid duplicatin get_cabac (cant be done yet as that would make optimization work hard)
-#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE)
+#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS)
 static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *significant_coeff_ctx_base, int *index){
     void *end= significant_coeff_ctx_base + max_coeff - 1;
     int minusstart= -(int)significant_coeff_ctx_base;
@@ -786,7 +786,7 @@ static int decode_significance_8x8_x86(CABACContext *c, uint8_t *significant_coe
     );
     return coeff_count;
 }
-#endif /* defined(ARCH_X86) && && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) */
+#endif /* defined(ARCH_X86) && && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */
 
 /**
  *

libavcodec/h264.c

@@ -6111,7 +6111,7 @@ static int decode_cabac_residual( H264Context *h, DCTELEM *block, int cat, int n
             index[coeff_count++] = last;\
         }
         const uint8_t *sig_off = significant_coeff_flag_offset_8x8[MB_FIELD];
-#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE)
+#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS)
         coeff_count= decode_significance_8x8_x86(CC, significant_coeff_ctx_base, index, sig_off);
     } else {
         coeff_count= decode_significance_x86(CC, max_coeff, significant_coeff_ctx_base, index);

libavutil/x86_cpu.h

@@ -61,4 +61,8 @@
 #  define CONFIG_7REGS 1
 #endif
 
+#if defined(ARCH_X86_64) && defined(PIC)
+#  define BROKEN_RELOCATIONS 1
+#endif
+
 #endif /* AVUTIL_X86CPU_H */