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, 6 insertions, 0 deletions

diff --git a/Source/cmMathCommand.cxx b/Source/cmMathCommand.cxx
index 5d1b099..a50e5fc 100644
--- a/Source/cmMathCommand.cxx
+++ b/Source/cmMathCommand.cxx
@@ -5,6 +5,7 @@
 #include "cmExprParserHelper.h"
 #include "cmMakefile.h"
 #include "cm_kwiml.h"
+#include "cmake.h"
 
 #include <stdio.h>
 
@@ -101,6 +102,11 @@ bool cmMathCommand::HandleExprCommand(std::vector<std::string> const& args)
   }
   sprintf(buffer, fmt, helper.GetResult());
 
+  std::string const& w = helper.GetWarning();
+  if (!w.empty()) {
+    this->Makefile->IssueMessage(cmake::AUTHOR_WARNING, w);
+  }
+
   this->Makefile->AddDefinition(outputVariable, buffer);
   return true;
 }