gallium: Introduce PIPE_ARCH_SSE define for SSE support.

Besides meaning x86 and x86-64 architecture, it also depends on SSE2
support enabled on gcc.

This fixes the linux-debug build.

src/gallium/auxiliary/draw/draw_vs_sse.c

@@ -37,7 +37,7 @@
 
 #include "draw_vs.h"
 
-#if defined(PIPE_ARCH_X86)
+#if defined(PIPE_ARCH_X86) && defined(PIPE_ARCH_SSE)
 
 #include "pipe/p_shader_tokens.h"
 

src/gallium/auxiliary/tgsi/tgsi_sse2.c

@@ -27,7 +27,7 @@
 
 #include "pipe/p_config.h"
 
-#ifdef PIPE_ARCH_X86
+#if defined(PIPE_ARCH_X86) && defined(PIPE_ARCH_SSE)
 
 #include "pipe/p_debug.h"
 #include "pipe/p_shader_tokens.h"

src/gallium/auxiliary/util/u_sse.h

@@ -39,7 +39,7 @@
 
 #include "pipe/p_config.h"
 
-#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
+#if defined(PIPE_ARCH_SSE)
 
 #include <xmmintrin.h>
 #include <emmintrin.h>

src/gallium/drivers/softpipe/sp_fs_sse.c

@@ -40,7 +40,7 @@
 #include "tgsi/tgsi_sse2.h"
 
 
-#ifdef PIPE_ARCH_X86
+#if defined(PIPE_ARCH_X86) && defined(PIPE_ARCH_SSE)
 
 #include "rtasm/rtasm_x86sse.h"
 

src/gallium/include/pipe/p_config.h

@@ -85,6 +85,14 @@
 #define PIPE_ARCH_X86_64
 #endif
 
+#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
+#if defined(PIPE_CC_GCC) && !defined(__SSE2__)
+/* #warning SSE2 support requires -msse -msse2 compiler options */
+#else
+#define PIPE_ARCH_SSE
+#endif
+#endif
+
 #if 0 /* FIXME */
 #define PIPE_ARCH_PPC
 #endif