Fix truck sized thinko where Darwin/ARM toolchain didn't look for programs in

libexec, *blush*.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83086 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/ToolChains.cpp

@@ -213,6 +213,13 @@ DarwinClang::DarwinClang(const HostInfo &Host, const llvm::Triple& Triple,
                          bool IsIPhoneOS)
   : Darwin(Host, Triple, DarwinVersion, IsIPhoneOS)
 {
+  // Add the relative libexec dir (for clang-cc).
+  //
+  // FIXME: We should sink clang-cc into libexec/clang/<version>/.
+  std::string Path = getHost().getDriver().Dir;
+  Path += "/../libexec";
+  getProgramPaths().push_back(Path);
+
   // We expect 'as', 'ld', etc. to be adjacent to our install dir.
   getProgramPaths().push_back(getHost().getDriver().Dir);
 }

test/Driver/darwin-arm.c

@@ -0,0 +1,4 @@
+// RUN: clang -ccc-host-triple i386-apple-darwin9 -arch arm -print-search-dirs | FileCheck %s
+
+// Check that we look in the relative libexec directory.
+// CHECK: {{programs: =.*/../libexec:}}