Get default -fms-compatibility-version from cl.exe's version
-fms-compatibility-version was defaulting to 18 (VS 2013), which is a pain if your environment is pointing to version 19 (VS 2015) libraries.
If cl.exe can be found, this patch uses its version number as the default instead. It re-uses the existing code to find the Visual Studio binaries folder and WinAPI methods to check its version. You can still explicitly specify a compatibility version on the command line. If you don't have cl.exe, this should be a no-op and you'll get the old default of 18.
This affected the tests, which assumed that if you didn't specific a version, that it would default to 18, but this won't be true for all machines. So a couple test cases had to be eliminated and a couple others had to be tweaked to allow for various outputs.
Addresses: https://llvm.org/bugs/show_bug.cgi?id=27215
Differential Revision: http://reviews.llvm.org/D20136
llvm-svn: 269515
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index b8fe086..5e1e6ca 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -1028,6 +1028,7 @@
bool getVisualStudioInstallDir(std::string &path) const;
bool getVisualStudioBinariesFolder(const char *clangProgramPath,
std::string &path) const;
+ VersionTuple getMSVCVersionFromExe() const override;
std::string ComputeEffectiveClangTriple(const llvm::opt::ArgList &Args,
types::ID InputType) const override;