Driver: fallback to the location of clang if no sysroot,

hard coding /usr makes little sense for mingw-w64.
If we have portable toolchains having /usr breaks that.
If the clang we use is in /usr/bin or /usr/sbin etc this will
still detect as though it was hard coded to /usr

This makes the most sense going forward for mingw-w64 toolchains
on both linux and mac

Differential Revision: http://reviews.llvm.org/D14164

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@253898 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Driver/MinGWToolChain.cpp b/lib/Driver/MinGWToolChain.cpp
index 938440b08f602fa43f13c9d92bb16d3d900ae0a5..2896bde9c9ef152d307ca1a57c033acdd3449aad 100644 (file)
--- a/lib/Driver/MinGWToolChain.cpp
+++ b/lib/Driver/MinGWToolChain.cpp
@@ -66,24 +66,20 @@ MinGW::MinGW(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
     : ToolChain(D, Triple, Args) {
   getProgramPaths().push_back(getDriver().getInstalledDir());
 
-// In Windows there aren't any standard install locations, we search
-// for gcc on the PATH. In Linux the base is always /usr.
+// On Windows if there is no sysroot we search for gcc on the PATH.
+
+if (getDriver().SysRoot.size())
+  Base = getDriver().SysRoot;
 #ifdef LLVM_ON_WIN32
-  if (getDriver().SysRoot.size())
-    Base = getDriver().SysRoot;
-  else if (llvm::ErrorOr<std::string> GPPName =
-               llvm::sys::findProgramByName("gcc"))
-    Base = llvm::sys::path::parent_path(
-        llvm::sys::path::parent_path(GPPName.get()));
-  else
-    Base = llvm::sys::path::parent_path(getDriver().getInstalledDir());
-#else
-  if (getDriver().SysRoot.size())
-    Base = getDriver().SysRoot;
-  else
-    Base = "/usr";
+else if (llvm::ErrorOr<std::string> GPPName =
+             llvm::sys::findProgramByName("gcc"))
+  Base = llvm::sys::path::parent_path(
+      llvm::sys::path::parent_path(GPPName.get()));
 #endif
 
+if (!Base.size())
+  Base = llvm::sys::path::parent_path(getDriver().getInstalledDir());
+
   Base += llvm::sys::path::get_separator();
   findGccLibDir();
   // GccLibDir must precede Base/lib so that the