r300555 - Driver: Better detection of mingw-gcc

[Martell Malone via cfe-commits]

Author: martell
Date: Tue Apr 18 09:27:36 2017
New Revision: 300555

URL: http://llvm.org/viewvc/llvm-project?rev=300555&view=rev
Log:
Driver: Better detection of mingw-gcc

Stop blindly searching for "gcc.exe" on windows.
Stop assuming "/usr" on unix, fixes cross compiling.

Reviewers: mati865, yaron.keren

Subscribers: ismail, rnk

Differential revision: https://reviews.llvm.org/D15005

Modified:
    cfe/trunk/lib/Driver/ToolChains/MinGW.cpp
    cfe/trunk/lib/Driver/ToolChains/MinGW.h

Modified: cfe/trunk/lib/Driver/ToolChains/MinGW.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/MinGW.cpp?rev=300555&r1=300554&r2=300555&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/ToolChains/MinGW.cpp (original)
+++ cfe/trunk/lib/Driver/ToolChains/MinGW.cpp Tue Apr 18 09:27:36 2017
@@ -285,28 +285,30 @@ void toolchains::MinGW::findGccLibDir()
   }
 }
 
+llvm::ErrorOr<std::string> toolchains::MinGW::findGcc() {
+  llvm::SmallVector<llvm::SmallString<32>, 2> Gccs;
+  Gccs.emplace_back(getTriple().getArchName());
+  Gccs[0] += "-w64-mingw32-gcc";
+  Gccs.emplace_back("mingw32-gcc");
+  // Please do not add "gcc" here
+  for (StringRef CandidateGcc : Gccs)
+    if (llvm::ErrorOr<std::string> GPPName = llvm::sys::findProgramByName(CandidateGcc))
+      return GPPName;
+  return make_error_code(std::errc::no_such_file_or_directory);
+}
+
 toolchains::MinGW::MinGW(const Driver &D, const llvm::Triple &Triple,
                          const ArgList &Args)
     : ToolChain(D, Triple, Args), CudaInstallation(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.
-#ifdef LLVM_ON_WIN32
   if (getDriver().SysRoot.size())
     Base = getDriver().SysRoot;
-  else if (llvm::ErrorOr<std::string> GPPName =
-               llvm::sys::findProgramByName("gcc"))
+  else if (llvm::ErrorOr<std::string> GPPName = findGcc())
     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";
-#endif
 
   Base += llvm::sys::path::get_separator();
   findGccLibDir();

Modified: cfe/trunk/lib/Driver/ToolChains/MinGW.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/MinGW.h?rev=300555&r1=300554&r2=300555&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/ToolChains/MinGW.h (original)
+++ cfe/trunk/lib/Driver/ToolChains/MinGW.h Tue Apr 18 09:27:36 2017
@@ -93,6 +93,7 @@ private:
   mutable std::unique_ptr<tools::gcc::Preprocessor> Preprocessor;
   mutable std::unique_ptr<tools::gcc::Compiler> Compiler;
   void findGccLibDir();
+  llvm::ErrorOr<std::string> findGcc();
 };
 
 } // end namespace toolchains