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-rw-r--r--source/slang/diagnostic-defs.h1
-rw-r--r--source/slang/preprocessor.cpp1
2 files changed, 2 insertions, 0 deletions
diff --git a/source/slang/diagnostic-defs.h b/source/slang/diagnostic-defs.h
index 83e82fc81..02edb6521 100644
--- a/source/slang/diagnostic-defs.h
+++ b/source/slang/diagnostic-defs.h
@@ -114,6 +114,7 @@ DIAGNOSTIC(15201, Error, syntaxErrorInPreprocessorExpression, "syntax error in p
DIAGNOSTIC(15202, Error, divideByZeroInPreprocessorExpression, "division by zero in preprocessor expression");
DIAGNOSTIC(15203, Error, expectedTokenInDefinedExpression, "expected '$0' in 'defined' expression");
DIAGNOSTIC(15204, Warning, directiveExpectsExpression, "'$0' directive requires an expression");
+DIAGNOSTIC(15205, Warning, undefinedIdentifierInPreprocessorExpression, "undefined idenfier '$0' in preprocessor expression will evaluate to zero")
DIAGNOSTIC(-1, Note, seeOpeningToken, "see opening '$0'")
diff --git a/source/slang/preprocessor.cpp b/source/slang/preprocessor.cpp
index 71c6fd4bb..d652d07bb 100644
--- a/source/slang/preprocessor.cpp
+++ b/source/slang/preprocessor.cpp
@@ -1213,6 +1213,7 @@ static PreprocessorExpressionValue ParseAndEvaluateUnaryExpression(PreprocessorD
// An identifier here means it was not defined as a macro (or
// it is defined, but as a function-like macro. These should
// just evaluate to zero (possibly with a warning)
+ GetSink(context)->diagnose(token.loc, Diagnostics::undefinedIdentifierInPreprocessorExpression, token.getName());
return 0;
}