Fix cmake build issues and gcc hang

contrib/glslopt/Main.cpp

@@ -4,6 +4,12 @@
 #include <stdlib.h>
 #include "glsl_optimizer.h"
 
+extern "C" void
+_mesa_error_no_memory(const char *caller)
+{
+   fprintf(stderr, "Mesa error: out of memory in %s", caller);
+}
+
 static glslopt_ctx* gContext = 0;
 
 static int printhelp(const char* msg)

src/glsl/opt_array_splitting.cpp

@@ -228,6 +228,11 @@ ir_array_reference_visitor::get_split_list(exec_list *instructions,
 
    /* Trim out variables we found that we can't split. */
    foreach_in_list_safe(variable_entry, entry, &variable_list) {
+#ifdef __GNUC__
+       // without this memory fence (or something like it),
+       // gcc will optimize out this loop.  See issue #44
+       __asm__("":::"memory");
+#endif
       if (debug) {
 	 printf("array %s@%p: decl %d, split %d\n",
 		entry->var->name, (void *) entry->var, entry->declaration,

src/glsl/standalone_scaffolding.cpp

@@ -50,10 +50,7 @@ _mesa_shader_debug(struct gl_context *, GLenum, GLuint *id,
 }
 
 extern "C" void
-_mesa_error_no_memory(const char *caller)
-{
-}
-
+_mesa_error_no_memory(const char *caller);
 
 struct gl_shader *
 _mesa_new_shader(struct gl_context *ctx, GLuint name, GLenum type)

tests/glsl_optimizer_tests.cpp

@@ -1,8 +1,17 @@
+#include <cstdio>
+#include <cstdlib>
 #include <string>
 #include <vector>
 #include <time.h>
 #include "../src/glsl/glsl_optimizer.h"
 
+extern "C" void
+_mesa_error_no_memory(const char *caller)
+{
+   fprintf(stderr, "Mesa error: out of memory in %s", caller);
+}
+
+
 #define GL_GLEXT_PROTOTYPES 1
 
 #if __linux__