Detect and give error on second occurrence of #version.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24347 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/preprocessor/Pp.cpp

@@ -694,8 +694,9 @@ int TPpContext::CPPversion(TPpToken* ppToken)
 {
     int token = currentInput->scan(this, currentInput, ppToken);
 
-    if (errorOnVersion)
+    if (errorOnVersion || versionSeen)
         parseContext.error(ppToken->loc, "must occur first in shader", "#version", "");
+    versionSeen = true;
 
     if (token == '\n') {
         parseContext.error(ppToken->loc, "must be followed by version number", "#version", "");

glslang/MachineIndependent/preprocessor/PpContext.cpp

@@ -155,6 +155,7 @@ void TPpContext::setInput(TInputScanner& input, bool versionWillBeError)
     in->prev = currentInput;
     currentInput = in;
     errorOnVersion = versionWillBeError;
+    versionSeen = false;
 }
 
 } // end namespace glslang

glslang/MachineIndependent/preprocessor/PpContext.h

@@ -208,6 +208,7 @@ protected:
 
     InputSrc *currentInput;
     bool errorOnVersion;
+    bool versionSeen;
 
     //
     // from Pp.cpp