Fixed GCC+Clang errors and warnings on Linux and OSX.

SPIRV/GlslangToSpv.h

@@ -34,7 +34,7 @@
 
 #pragma once
 
-#if _MSC_VER >= 1900
+#if defined(_MSC_VER) && _MSC_VER >= 1900
     #pragma warning(disable : 4464) // relative include path contains '..'
 #endif
 

glslang/Include/Common.h

@@ -37,7 +37,7 @@
 #ifndef _COMMON_INCLUDED_
 #define _COMMON_INCLUDED_
 
-#if (defined(_MSC_VER) && _MSC_VER < 1900 /*vs2015*/) || defined MINGW_HAS_SECURE_API
+#if (defined(_MSC_VER) && _MSC_VER < 1900 /*vs2015*/) // || defined MINGW_HAS_SECURE_API
     #include <basetsd.h>
     #define snprintf sprintf_s
     #define safe_vsprintf(buf,max,format,args) vsnprintf_s((buf), (max), (max), (format), (args))
@@ -51,7 +51,7 @@
     #define UINT_PTR uintptr_t
 #endif
 
-#if defined(__ANDROID__) || _MSC_VER < 1700
+#if defined(__ANDROID__) || (defined(_MSC_VER) && _MSC_VER < 1700)
 #include <sstream>
 namespace std {
 template<typename T>

glslang/Include/intermediate.h

@@ -46,7 +46,7 @@
 #ifndef __INTERMEDIATE_H
 #define __INTERMEDIATE_H
 
-#if _MSC_VER >= 1900
+#if defined(_MSC_VER) && _MSC_VER >= 1900
     #pragma warning(disable : 4464) // relative include path contains '..'
     #pragma warning(disable : 5026) // 'glslang::TIntermUnary': move constructor was implicitly defined as deleted
 #endif

hlsl/hlslParseHelper.cpp

@@ -7446,8 +7446,8 @@ const TFunction* HlslParseContext::findFunction(const TSourceLoc& loc, TFunction
             }
         };
 
-        return std::abs(linearize(to2.getBasicType()) - linearize(from.getBasicType())) <
-               std::abs(linearize(to1.getBasicType()) - linearize(from.getBasicType()));
+        return abs(linearize(to2.getBasicType()) - linearize(from.getBasicType())) <
+               abs(linearize(to1.getBasicType()) - linearize(from.getBasicType()));
     };
 
     // for ambiguity reporting