attribute used patch by (mitya at school dot ioffe dot ru (Dmitry Baryshkov))

Originally committed as revision 2830 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/common.h

@@ -82,6 +82,12 @@ extern const struct AVOption avoptions_workaround_bug[11];
 #    define always_inline inline
 #endif
 
+#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
+#    define attribute_used __attribute__((used))
+#else
+#    define attribute_used
+#endif
+
 #ifndef EMULATE_INTTYPES
 #   include <inttypes.h>
 #else

libavcodec/i386/dsputil_mmx.c

@@ -31,16 +31,16 @@ extern const uint8_t ff_h263_loop_filter_strength[32];
 int mm_flags; /* multimedia extension flags */
 
 /* pixel operations */
-static const uint64_t mm_bone __attribute__ ((aligned(8))) = 0x0101010101010101ULL;
-static const uint64_t mm_wone __attribute__ ((aligned(8))) = 0x0001000100010001ULL;
-static const uint64_t mm_wtwo __attribute__ ((aligned(8))) = 0x0002000200020002ULL;
+static const uint64_t mm_bone attribute_used __attribute__ ((aligned(8))) = 0x0101010101010101ULL;
+static const uint64_t mm_wone attribute_used __attribute__ ((aligned(8))) = 0x0001000100010001ULL;
+static const uint64_t mm_wtwo attribute_used __attribute__ ((aligned(8))) = 0x0002000200020002ULL;
 
-static const uint64_t ff_pw_20 __attribute__ ((aligned(8))) = 0x0014001400140014ULL;
-static const uint64_t ff_pw_3  __attribute__ ((aligned(8))) = 0x0003000300030003ULL;
-static const uint64_t ff_pw_16 __attribute__ ((aligned(8))) = 0x0010001000100010ULL;
-static const uint64_t ff_pw_15 __attribute__ ((aligned(8))) = 0x000F000F000F000FULL;
+static const uint64_t ff_pw_20 attribute_used __attribute__ ((aligned(8))) = 0x0014001400140014ULL;
+static const uint64_t ff_pw_3  attribute_used __attribute__ ((aligned(8))) = 0x0003000300030003ULL;
+static const uint64_t ff_pw_16 attribute_used __attribute__ ((aligned(8))) = 0x0010001000100010ULL;
+static const uint64_t ff_pw_15 attribute_used __attribute__ ((aligned(8))) = 0x000F000F000F000FULL;
 
-static const uint64_t ff_pb_FC __attribute__ ((aligned(8))) = 0xFCFCFCFCFCFCFCFCULL;
+static const uint64_t ff_pb_FC attribute_used __attribute__ ((aligned(8))) = 0xFCFCFCFCFCFCFCFCULL;
 
 #define JUMPALIGN() __asm __volatile (".balign 8"::)
 #define MOVQ_ZERO(regd)  __asm __volatile ("pxor %%" #regd ", %%" #regd ::)

libavcodec/i386/motion_est_mmx.c

@@ -27,7 +27,7 @@ static const __attribute__ ((aligned(8))) uint64_t round_tab[3]={
 0x0002000200020002ULL,
 };
 
-static __attribute__ ((aligned(8), unused)) uint64_t bone= 0x0101010101010101LL;
+static attribute_used __attribute__ ((aligned(8))) uint64_t bone= 0x0101010101010101LL;
 
 static inline void sad8_1_mmx(uint8_t *blk1, uint8_t *blk2, int stride, int h)
 {

libavcodec/i386/simple_idct_mmx.c

@@ -45,8 +45,8 @@
 #define ROW_SHIFT 11
 #define COL_SHIFT 20 // 6
 
-static const uint64_t __attribute__((aligned(8))) wm1010= 0xFFFF0000FFFF0000ULL;
-static const uint64_t __attribute__((aligned(8))) d40000= 0x0000000000040000ULL;
+static const uint64_t attribute_used __attribute__((aligned(8))) wm1010= 0xFFFF0000FFFF0000ULL;
+static const uint64_t attribute_used __attribute__((aligned(8))) d40000= 0x0000000000040000ULL;
 
 static const int16_t __attribute__((aligned(8))) coeffs[]= {
 	1<<(ROW_SHIFT-1), 0, 1<<(ROW_SHIFT-1), 0,