PP: Fix #1694: Handle badly formed argument substitution.

Test/baseResults/cppBad.vert.out

 cppBad.vert
-ERROR: 0:2: 'preprocessor evaluation' : bad expression 
-ERROR: 0:2: '#if' : unexpected tokens following directive 
-ERROR: 0:5: 'string' : End of line in string 
-ERROR: 0:5: '""' : string literals not supported 
-ERROR: 0:5: '' :  syntax error, unexpected INT, expecting COMMA or SEMICOLON
+WARNING: 0:1: '#define' : missing space after macro name 
+ERROR: 0:3: 'preprocessor evaluation' : bad expression 
+ERROR: 0:3: '#if' : unexpected tokens following directive 
+ERROR: 0:6: 'string' : End of line in string 
+ERROR: 0:6: '""' : string literals not supported 
+ERROR: 0:6: '' :  syntax error, unexpected INT, expecting COMMA or SEMICOLON
 ERROR: 5 compilation errors.  No code generated.
 
 

Test/baseResults/cppBad3.vert.out

+cppBad3.vert
+ERROR: 0:3: 'macro expansion' : End of input in macro y
+ERROR: 1 compilation errors.  No code generated.
+
+
+Shader version: 100
+ERROR: node is still EOpNull!
+0:?   Linker Objects
+
+
+Linked vertex stage:
+
+ERROR: Linking vertex stage: Missing entry point: Each stage requires one entry point
+
+Shader version: 100
+ERROR: node is still EOpNull!
+0:?   Linker Objects
+

Test/cppBad.vert

-#define m#0#
+#define n#0#
+#define m #0#
 #if m
 #endif
 #define n()

Test/cppBad3.vert

+#define f =y(.
+#define y(m)
+y(f)
\ No newline at end of file

glslang/MachineIndependent/preprocessor/Pp.cpp

@@ -147,6 +147,10 @@ int TPpContext::CPPdefine(TPpToken* ppToken)
         }
 
         token = scanToken(ppToken);
+    } else if (token != '\n' && token != EndOfInput && !ppToken->space) {
+        parseContext.ppWarn(ppToken->loc, "missing space after macro name", "#define", "");
+
+        return token;
     }
 
     // record the definition of the macro

glslang/MachineIndependent/preprocessor/PpScanner.cpp

@@ -1056,7 +1056,7 @@ int TPpContext::tokenize(TPpToken& ppToken)
         // Handle token-pasting logic
         token = tokenPaste(token, ppToken);
 
-        if (token == EndOfInput) {
+        if (token == EndOfInput || token == tMarkerInput::marker) {
             missingEndifCheck();
             return EndOfInput;
         }

gtests/AST.FromFile.cpp

@@ -96,6 +96,7 @@ INSTANTIATE_TEST_CASE_P(
         "cppNest.vert",
         "cppBad.vert",
         "cppBad2.vert",
+        "cppBad3.vert",
         "cppComplexExpr.vert",
         "cppDeepNest.frag",
         "cppPassMacroName.frag",