math: Restore toleration of unexpected characters in an expression

Prior to commit 7c4c13ffef (math: Reject unexpected expression input
explicitly, 2018-05-18) we ignored unexpected characters in an
expression that otherwise can be parsed.  In order to preserve
compatibility with projects that accidentally used this, convert the
error to a warning.

1 files changed, 5 insertions, 0 deletions

diff --git a/Source/cmExprParserHelper.h b/Source/cmExprParserHelper.h
index 15e8f3e..42c460a 100644
--- a/Source/cmExprParserHelper.h
+++ b/Source/cmExprParserHelper.h
@@ -32,6 +32,10 @@ public:
 
   const char* GetError() { return this->ErrorString.c_str(); }
 
+  void UnexpectedChar(char c);
+
+  std::string const& GetWarning() const { return this->WarningString; }
+
 private:
   std::string::size_type InputBufferPos;
   std::string InputBuffer;
@@ -47,6 +51,7 @@ private:
   const char* FileName;
   long FileLine;
   std::string ErrorString;
+  std::string WarningString;
 };
 
 #define YYSTYPE cmExprParserHelper::ParserType