Add a default system include of '/include'. This isn't particularly
useful when using Clang as a system-compiler, but its harmless. When
using Clang as a cross-compiler, this can be very handy as quite a few
toolchains ship their libc headers here rather than under
'/usr/include'.
For reference, this is the beginning of my work to also make the Clang
driver more suitable as a cross-compiler.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144089 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index d787ee0..c3861ef 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -1987,6 +1987,11 @@
if (getTriple().getOS() == llvm::Triple::RTEMS)
return;
+ // Add an include of '/include' directly. This isn't provided by default by
+ // system GCCs, but is often used with cross-compiling GCCs, and harmless to
+ // add even when Clang is acting as-if it were a system compiler.
+ addExternCSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include");
+
addExternCSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/usr/include");
}