Add support for CPATH and friends.
This moves the existing code for CPATH into the driver and adds the environment lookup and path splitting there.
The paths are then passed down to cc1 with -I options (CPATH), added after the normal user-specified include dirs.
Language specific paths are passed via -LANG-isystem and the actual filtering is performed in the frontend.
I tried to match GCC's behavior as close as possible
Fixes PR8971.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140341 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index ba9469a..ad61f6a 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -623,8 +623,16 @@
HelpText<"Make the next included directory (-I or -F) an indexer header map">;
def iquote : JoinedOrSeparate<"-iquote">, MetaVarName<"<directory>">,
HelpText<"Add directory to QUOTE include search path">;
+def c_isystem : JoinedOrSeparate<"-c-isystem">, MetaVarName<"<directory>">,
+ HelpText<"Add directory to the C SYSTEM include search path">;
def cxx_isystem : JoinedOrSeparate<"-cxx-isystem">, MetaVarName<"<directory>">,
HelpText<"Add directory to the C++ SYSTEM include search path">;
+def objc_isystem : JoinedOrSeparate<"-objc-isystem">,
+ MetaVarName<"<directory>">,
+ HelpText<"Add directory to the ObjC SYSTEM include search path">;
+def objcxx_isystem : JoinedOrSeparate<"-objcxx-isystem">,
+ MetaVarName<"<directory>">,
+ HelpText<"Add directory to the ObjC++ SYSTEM include search path">;
def isystem : JoinedOrSeparate<"-isystem">, MetaVarName<"<directory>">,
HelpText<"Add directory to SYSTEM include search path">;
def iwithsysroot : JoinedOrSeparate<"-iwithsysroot">,MetaVarName<"<directory>">,