From 628b899be14a6bab4b32dbd53aabd447dcc16cb7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Sat, 20 Aug 2016 23:47:41 +0200
Subject: [PATCH] llvm-config: Clean up exported values, update for shared
 linking

Gentoo-specific fixup for llvm-config, including:
- making --src-root return invalid path (/dev/null).

Thanks to Steven Newbury for the initial patch.

Bug: https://bugs.gentoo.org/565358
Bug: https://bugs.gentoo.org/501684

diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
index d780094861c..c61c72ff48c 100644
--- a/tools/llvm-config/llvm-config.cpp
+++ b/tools/llvm-config/llvm-config.cpp
@@ -549,7 +550,11 @@ int main(int argc, char **argv) {
       } else if (Arg == "--obj-root") {
         OS << ActivePrefix << '\n';
       } else if (Arg == "--src-root") {
-        OS << LLVM_SRC_ROOT << '\n';
+        if (IsInDevelopmentTree) {
+          OS << LLVM_SRC_ROOT << '\n';
+        } else {
+          OS << "/dev/null\n";
+        }
       } else if (Arg == "--ignore-libllvm") {
         LinkDyLib = false;
         LinkMode = BuiltSharedLibs ? LinkModeShared : LinkModeAuto;
-- 
2.11.0