Horrible hack for systems that use -dumpversion with clang to expect versions

that match gcc versions. Eew.

llvm-svn: 122080

clang/include/clang/Basic/Version.h

@@ -40,6 +40,10 @@
   CLANG_MAKE_VERSION_STRING(CLANG_VERSION_MAJOR,CLANG_VERSION_MINOR)
 #endif
 
+/// \brief A horrible hack to work around projects that depend upon gcc
+/// compatible compilers having versions that resemble gcc.
+#define GCC_COMPAT_VERSION_STRING CLANG_MAKE_VERSION_STRING(4,2)
+
 namespace clang {
   /// \brief Retrieves the repository path (e.g., Subversion path) that 
   /// identifies the particular Clang branch, tag, or trunk from which this

clang/lib/Driver/Driver.cpp

@@ -417,8 +417,11 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
     return false;
   }
 
+  // This is a horrible hack. Some projects depend on gcc-like versions
+  // coming out of gcc -dumpversion to determine if the gcc compatible
+  // compiler has a correct version. Ideally we'd fix all of those projects.
   if (C.getArgs().hasArg(options::OPT_dumpversion)) {
-    llvm::outs() << CLANG_VERSION_STRING "\n";
+    llvm::outs() << GCC_COMPAT_VERSION_STRING "\n";
     return false;
   }