Fix issue #676: emit error message on failure to open spv file.

SPIRV/GlslangToSpv.cpp

@@ -5319,6 +5319,8 @@ void OutputSpvBin(const std::vector<unsigned int>& spirv, const char* baseName)
 {
     std::ofstream out;
     out.open(baseName, std::ios::binary | std::ios::out);
+    if (out.fail())
+        printf("ERROR: Failed to open file: %s\n", baseName);
     for (int i = 0; i < (int)spirv.size(); ++i) {
         unsigned int word = spirv[i];
         out.write((const char*)&word, 4);
@@ -5331,6 +5333,8 @@ void OutputSpvHex(const std::vector<unsigned int>& spirv, const char* baseName,
 {
     std::ofstream out;
     out.open(baseName, std::ios::binary | std::ios::out);
+    if (out.fail())
+        printf("ERROR: Failed to open file: %s\n", baseName);
     out << "\t// " GLSLANG_REVISION " " GLSLANG_DATE << std::endl;
     if (varName != nullptr) {
         out << "\t #pragma once" << std::endl;

glslang/Include/revision.h

@@ -2,5 +2,5 @@
 // For the version, it uses the latest git tag followed by the number of commits.
 // For the date, it uses the current date (when then script is run).
 
-#define GLSLANG_REVISION "Overload400-PrecQual.1842"
-#define GLSLANG_DATE "17-Feb-2017"
+#define GLSLANG_REVISION "Overload400-PrecQual.1843"
+#define GLSLANG_DATE "18-Feb-2017"