dsp: add DSP_INIT_STUB

generates a stub function when the specific architecture is not enabled,
exposing a symbol in the module, avoiding a compiler warning

Change-Id: Ia9336e57466a9b5241b85c1c95838e91c9283147

src/dsp/alpha_processing_mips_dsp_r2.c

@@ -136,7 +136,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void WebPInitAlphaProcessingMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(WebPInitAlphaProcessingMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/alpha_processing_sse2.c

@@ -293,7 +293,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void WebPInitAlphaProcessingSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE2(void) {}
+WEBP_DSP_INIT_STUB(WebPInitAlphaProcessingSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/argb_mips_dsp_r2.c

@@ -105,7 +105,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspARGBInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void VP8EncDspARGBInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspARGBInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspARGBInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/argb_sse2.c

@@ -62,7 +62,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspARGBInitSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void VP8EncDspARGBInitSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspARGBInitSSE2(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspARGBInitSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/cost_mips32.c

@@ -149,7 +149,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitMIPS32(void) {
 
 #else  // !WEBP_USE_MIPS32
 
-extern void VP8EncDspCostInitMIPS32(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitMIPS32(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspCostInitMIPS32)
 
 #endif  // WEBP_USE_MIPS32

src/dsp/cost_mips_dsp_r2.c

@@ -102,7 +102,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void VP8EncDspCostInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspCostInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/cost_sse2.c

@@ -119,7 +119,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void VP8EncDspCostInitSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitSSE2(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspCostInitSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/dec_mips32.c

@@ -582,7 +582,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitMIPS32(void) {
 
 #else  // !WEBP_USE_MIPS32
 
-extern void VP8DspInitMIPS32(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitMIPS32(void) {}
+WEBP_DSP_INIT_STUB(VP8DspInitMIPS32)
 
 #endif  // WEBP_USE_MIPS32

src/dsp/dec_mips_dsp_r2.c

@@ -989,7 +989,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void VP8DspInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(VP8DspInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/dec_neon.c

@@ -1486,7 +1486,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
 
 #else  // !WEBP_USE_NEON
 
-extern void VP8DspInitNEON(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {}
+WEBP_DSP_INIT_STUB(VP8DspInitNEON)
 
 #endif  // WEBP_USE_NEON

src/dsp/dec_sse2.c

@@ -1280,7 +1280,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void VP8DspInitSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitSSE2(void) {}
+WEBP_DSP_INIT_STUB(VP8DspInitSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/dec_sse41.c

@@ -40,7 +40,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitSSE41(void) {
 
 #else  // !WEBP_USE_SSE41
 
-extern void VP8DspInitSSE41(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitSSE41(void) {}
+WEBP_DSP_INIT_STUB(VP8DspInitSSE41)
 
 #endif  // WEBP_USE_SSE41

src/dsp/dsp.h

@@ -122,6 +122,15 @@ typedef enum {
 typedef int (*VP8CPUInfo)(CPUFeature feature);
 WEBP_EXTERN(VP8CPUInfo) VP8GetCPUInfo;
 
+//------------------------------------------------------------------------------
+// Init stub generator
+
+// Defines an init function stub to ensure each module exposes a symbol,
+// avoiding a compiler warning.
+#define WEBP_DSP_INIT_STUB(func) \
+  extern void func(void); \
+  WEBP_TSAN_IGNORE_FUNCTION void func(void) {}
+
 //------------------------------------------------------------------------------
 // Encoding
 

src/dsp/enc_avx2.c

@@ -18,7 +18,4 @@
 //------------------------------------------------------------------------------
 // Entry point
 
-extern void VP8EncDspInitAVX2(void);
-
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitAVX2(void) {
-}
+WEBP_DSP_INIT_STUB(VP8EncDspInitAVX2)

src/dsp/enc_mips32.c

@@ -667,7 +667,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitMIPS32(void) {
 
 #else  // !WEBP_USE_MIPS32
 
-extern void VP8EncDspInitMIPS32(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitMIPS32(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspInitMIPS32)
 
 #endif  // WEBP_USE_MIPS32

src/dsp/enc_mips_dsp_r2.c

@@ -1507,7 +1507,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void VP8EncDspInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/enc_neon.c

@@ -929,7 +929,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitNEON(void) {
 
 #else  // !WEBP_USE_NEON
 
-extern void VP8EncDspInitNEON(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitNEON(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspInitNEON)
 
 #endif  // WEBP_USE_NEON

src/dsp/enc_sse2.c

@@ -937,7 +937,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void VP8EncDspInitSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitSSE2(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspInitSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/enc_sse41.c

@@ -420,7 +420,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitSSE41(void) {
 
 #else  // !WEBP_USE_SSE41
 
-extern void VP8EncDspInitSSE41(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitSSE41(void) {}
+WEBP_DSP_INIT_STUB(VP8EncDspInitSSE41)
 
 #endif  // WEBP_USE_SSE41

src/dsp/filters_mips_dsp_r2.c

@@ -400,7 +400,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void VP8FiltersInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(VP8FiltersInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/filters_sse2.c

@@ -347,7 +347,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInitSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void VP8FiltersInitSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInitSSE2(void) {}
+WEBP_DSP_INIT_STUB(VP8FiltersInitSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/lossless_enc_mips32.c

@@ -413,7 +413,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitMIPS32(void) {
 
 #else  // !WEBP_USE_MIPS32
 
-extern void VP8LEncDspInitMIPS32(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitMIPS32(void) {}
+WEBP_DSP_INIT_STUB(VP8LEncDspInitMIPS32)
 
 #endif  // WEBP_USE_MIPS32

src/dsp/lossless_enc_mips_dsp_r2.c

@@ -270,7 +270,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void VP8LEncDspInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(VP8LEncDspInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/lossless_enc_neon.c

@@ -87,7 +87,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitNEON(void) {
 
 #else  // !WEBP_USE_NEON
 
-extern void VP8LEncDspInitNEON(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitNEON(void) {}
+WEBP_DSP_INIT_STUB(VP8LEncDspInitNEON)
 
 #endif  // WEBP_USE_NEON

src/dsp/lossless_enc_sse2.c

@@ -188,7 +188,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void VP8LEncDspInitSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitSSE2(void) {}
+WEBP_DSP_INIT_STUB(VP8LEncDspInitSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/lossless_mips_dsp_r2.c

@@ -675,7 +675,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void VP8LDspInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(VP8LDspInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/lossless_neon.c

@@ -335,7 +335,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitNEON(void) {
 
 #else  // !WEBP_USE_NEON
 
-extern void VP8LDspInitNEON(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitNEON(void) {}
+WEBP_DSP_INIT_STUB(VP8LDspInitNEON)
 
 #endif  // WEBP_USE_NEON

src/dsp/lossless_sse2.c

@@ -388,7 +388,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void VP8LDspInitSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitSSE2(void) {}
+WEBP_DSP_INIT_STUB(VP8LDspInitSSE2)
 
 #endif  // WEBP_USE_SSE2

src/dsp/rescaler_mips32.c

@@ -189,7 +189,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPS32(void) {
 
 #else  // !WEBP_USE_MIPS32
 
-extern void WebPRescalerDspInitMIPS32(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPS32(void) {}
+WEBP_DSP_INIT_STUB(WebPRescalerDspInitMIPS32)
 
 #endif  // WEBP_USE_MIPS32

src/dsp/rescaler_mips_dsp_r2.c

@@ -207,7 +207,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void WebPRescalerDspInitMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(WebPRescalerDspInitMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/upsampling_mips_dsp_r2.c

@@ -273,12 +273,10 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void WebPInitYUV444ConvertersMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2
 
 #if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2))
-extern void WebPInitUpsamplersMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(WebPInitUpsamplersMIPSdspR2)
 #endif

src/dsp/upsampling_neon.c

@@ -257,6 +257,5 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersNEON(void) {
 #endif  // WEBP_USE_NEON
 
 #if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_NEON))
-extern void WebPInitUpsamplersNEON(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersNEON(void) {}
+WEBP_DSP_INIT_STUB(WebPInitUpsamplersNEON)
 #endif

src/dsp/upsampling_sse2.c

@@ -204,6 +204,5 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE2(void) {
 #endif  // WEBP_USE_SSE2
 
 #if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_SSE2))
-extern void WebPInitUpsamplersSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE2(void) {}
+WEBP_DSP_INIT_STUB(WebPInitUpsamplersSSE2)
 #endif

src/dsp/yuv_mips32.c

@@ -98,7 +98,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPS32(void) {
 
 #else  // !WEBP_USE_MIPS32
 
-extern void WebPInitSamplersMIPS32(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPS32(void) {}
+WEBP_DSP_INIT_STUB(WebPInitSamplersMIPS32)
 
 #endif  // WEBP_USE_MIPS32

src/dsp/yuv_mips_dsp_r2.c

@@ -129,7 +129,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPSdspR2(void) {
 
 #else  // !WEBP_USE_MIPS_DSP_R2
 
-extern void WebPInitSamplersMIPSdspR2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPSdspR2(void) {}
+WEBP_DSP_INIT_STUB(WebPInitSamplersMIPSdspR2)
 
 #endif  // WEBP_USE_MIPS_DSP_R2

src/dsp/yuv_sse2.c

@@ -319,7 +319,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersSSE2(void) {
 
 #else  // !WEBP_USE_SSE2
 
-extern void WebPInitSamplersSSE2(void);
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersSSE2(void) {}
+WEBP_DSP_INIT_STUB(WebPInitSamplersSSE2)
 
 #endif  // WEBP_USE_SSE2