[PATCH] D49244: Always search sysroot for GCC installs

[David Greene via Phabricator via cfe-commits]

greened updated this revision to Diff 168472.
greened added a comment.

Updated to implement option 2.  I'm not totally happy with passing a StringRef just to check if it's non-empty but opted to reduce the size of the diff rather than refactor a bunch of stuff.


Repository:
  rC Clang

https://reviews.llvm.org/D49244

Files:
  lib/Driver/ToolChains/Gnu.cpp


Index: lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- lib/Driver/ToolChains/Gnu.cpp
+++ lib/Driver/ToolChains/Gnu.cpp
@@ -1618,10 +1618,18 @@
   return GoodVersion;
 }
 
-static llvm::StringRef getGCCToolchainDir(const ArgList &Args) {
+static llvm::StringRef getGCCToolchainDir(const ArgList &Args,
+                                          llvm::StringRef SysRoot) {
   const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
   if (A)
     return A->getValue();
+
+  // If we have a SysRoot, ignore GCC_INSTALL_PREFIX.
+  // GCC_INSTALL_PREFIX specifies the gcc installation for the default
+  // sysroot and is likely not valid with a different sysroot.
+  if (!SysRoot.empty())
+    return "";
+
   return GCC_INSTALL_PREFIX;
 }
 
@@ -1653,7 +1661,7 @@
   SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
                                        D.PrefixDirs.end());
 
-  StringRef GCCToolchainDir = getGCCToolchainDir(Args);
+  StringRef GCCToolchainDir = getGCCToolchainDir(Args, D.SysRoot);
   if (GCCToolchainDir != "") {
     if (GCCToolchainDir.back() == '/')
       GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /


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