Now that multiple prefixes are much cheaper to search for GCC
installations, support them when installed directly under the system
root ('/lib/gcc/...' essentially).
With this, Clang can correctly detect and use a cross-compiling GCC
installation within a system root and use it.
Again, test cases will be coming in later commits, as I'm going to write
a few test cases that exercise nearly all of this logic.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141121 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index ec11e73..14ac85e 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -1639,6 +1639,7 @@
// Compute the set of prefixes for our search.
SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
D.PrefixDirs.end());
+ Prefixes.push_back(D.SysRoot);
Prefixes.push_back(D.SysRoot + "/usr");
// Loop over the various components which exist and select the best GCC