nixpkgs/pkgs/development/compilers/swift/patches/llvm-include-dirs.patch

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Only use the Nix include dirs when no sysroot is configured.
--- clang/lib/Driver/ToolChains/Linux.cpp 2018-10-05 18:01:15.731109551 +0200
+++ clang/lib/Driver/ToolChains/Linux.cpp 2018-10-05 18:00:27.959509924 +0200
@@ -641,7 +641,7 @@
// Check for configure-time C include directories.
StringRef CIncludeDirs(C_INCLUDE_DIRS);
- if (CIncludeDirs != "") {
+ if (CIncludeDirs != "" && (SysRoot.empty() || SysRoot == "/")) {
SmallVector<StringRef, 5> dirs;
CIncludeDirs.split(dirs, ":");
for (StringRef dir : dirs) {