Use -isystem rather than relying on -isysroot to work consistently
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149626 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Modules/cstd.m b/test/Modules/cstd.m
index adef66b..85780f4 100644
--- a/test/Modules/cstd.m
+++ b/test/Modules/cstd.m
@@ -1,5 +1,5 @@
// RUN: rm -rf %t
-// RUN: %clang -fsyntax-only -v -isysroot %S/Inputs/System -fmodules -fmodule-cache-path %t -D__need_wint_t -Werror=implicit-function-declaration %s
+// RUN: %clang -fsyntax-only -isystem %S/Inputs/System/usr/include -fmodules -fmodule-cache-path %t -D__need_wint_t -Werror=implicit-function-declaration %s
// Supplied by compiler, but referenced from the "/usr/include" module map.
@import cstd.float_constants;
