1 files changed, 18 insertions, 7 deletions

diff --git a/Source/cmCommandArgumentParserHelper.cxx b/Source/cmCommandArgumentParserHelper.cxx
index f1efa68..2aa6c0c 100644
--- a/Source/cmCommandArgumentParserHelper.cxx
+++ b/Source/cmCommandArgumentParserHelper.cxx
@@ -87,8 +87,10 @@ char* cmCommandArgumentParserHelper::ExpandSpecialVariable(const char* key,
       }
     return this->EmptyVariable;
     }
-  cmSystemTools::Error("Key ", key, 
-                       " is not used yet. For now only $ENV{..} is allowed");
+  cmOStringStream e;
+  e << "Syntax $" << key << "{} is not supported.  "
+    << "Only ${} and ENV{} are allowed.";
+  this->SetError(e.str());
   return 0;
 }
 
@@ -216,10 +218,11 @@ bool cmCommandArgumentParserHelper::HandleEscapeSymbol
     this->AllocateParserType(pt, "\0", 1);
     break;
   default:
-    char buffer[2];
-    buffer[0] = symbol;
-    buffer[1] = 0;
-    cmSystemTools::Error("Invalid escape sequence \\", buffer);
+    {
+    cmOStringStream e;
+    e << "Invalid escape sequence \\" << symbol;
+    this->SetError(e.str());
+    }
     return false;
     }
   return true;
@@ -300,7 +303,7 @@ void cmCommandArgumentParserHelper::Error(const char* str)
   unsigned long pos = static_cast<unsigned long>(this->InputBufferPos);
   cmOStringStream ostr;
   ostr << str << " (" << pos << ")";
-  this->ErrorString = ostr.str();
+  this->SetError(ostr.str());
 }
 
 void cmCommandArgumentParserHelper::SetMakefile(const cmMakefile* mf)
@@ -318,3 +321,11 @@ void cmCommandArgumentParserHelper::SetResult(const char* value)
   this->Result = value;
 }
 
+void cmCommandArgumentParserHelper::SetError(std::string const& msg)
+{
+  // Keep only the first error.
+  if(this->ErrorString.empty())
+    {
+    this->ErrorString = msg;
+    }
+}