ENH: Support more preprocessor values in VS6

Previously we rejected all preprocessor definition values containing
spaces for the VS6 IDE generator.  In fact VS6 does support spaces but
not in combination with '"', '$', or ';', and only if we use the sytnax
'-DNAME="value with spaces"' instead of '-D"NAME=value with spaces"'.
Now we support all definition values that do not have one of these
invalid pairs.  See issue #8779.

3 files changed, 15 insertions, 6 deletions

diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index c38bedd..f66988e 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -1994,8 +1994,15 @@ void cmLocalGenerator::AppendDefines(std::string& defines,
       }
     else
       {
-      // Make the definition appear properly on the command line.
-      defines += this->EscapeForShell(di->c_str(), true);
+      // Make the definition appear properly on the command line.  Use
+      // -DNAME="value" instead of -D"NAME=value" to help VS6 parser.
+      std::string::size_type eq = di->find("=");
+      defines += di->substr(0, eq);
+      if(eq != di->npos)
+        {
+        defines += "=";
+        defines += this->EscapeForShell(di->c_str() + eq + 1, true);
+        }
       }
     }
 }
diff --git a/Source/cmLocalVisualStudio6Generator.cxx b/Source/cmLocalVisualStudio6Generator.cxx
index 8ecfa0d..9373e31 100644
--- a/Source/cmLocalVisualStudio6Generator.cxx
+++ b/Source/cmLocalVisualStudio6Generator.cxx
@@ -1712,11 +1712,12 @@ cmLocalVisualStudio6Generator
     }
 
   // Now do the VS6-specific check.
-  if(define.find_first_of(" ") != define.npos)
+  if(define.find_first_of(" ") != define.npos &&
+     define.find_first_of("\"$;") != define.npos)
     {
     cmOStringStream e;
     e << "WARNING: The VS6 IDE does not support preprocessor definition "
-      << "values with spaces.\n"
+      << "values with spaces and '\"', '$', or ';'.\n"
       << "CMake is dropping a preprocessor definition: " << define << "\n"
       << "Consider defining the macro in a (configured) header file.\n";
     cmSystemTools::Message(e.str().c_str());
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index a0b536b..fc57276 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -1216,10 +1216,11 @@ bool cmMakefile::ParseDefineFlag(std::string const& def, bool remove)
     return false;
     }
 
-  // VS6 IDE does not support definition values with spaces.
+  // VS6 IDE does not support definition values with spaces in
+  // combination with '"', '$', or ';'.
   if((strcmp(this->LocalGenerator->GetGlobalGenerator()->GetName(),
              "Visual Studio 6") == 0) &&
-     (def.find(" ") != def.npos))
+     (def.find(" ") != def.npos && def.find_first_of("\"$;") != def.npos))
     {
     return false;
     }