Move libc++ configs and flags out of //build/config/sanitizers

build/config/libc++/BUILD.gn

Index: build/config/libc++/BUILD.gn
diff --git a/build/config/libc++/BUILD.gn b/build/config/libc++/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..fd3b40e8c44441574fedb3ecedfdabdb392f88e0
--- /dev/null
+++ b/build/config/libc++/BUILD.gn
@@ -0,0 +1,13 @@
+import("//build/config/libc++/libc++.gni")

[brettw, 2017/06/12 17:55:18]

This file and the next one need the copyright header.

[Tom Anderson, 2017/06/16 20:49:50]

Done.

+
+config("libc++flags") {
+  if (use_custom_libcxx) {
+    prefix = "//buildtools/third_party"
+    include = "trunk/include"
+    cflags_cc = [
+      "-nostdinc++",
+      "-isystem" + rebase_path("$prefix/libc++/$include", root_build_dir),
+      "-isystem" + rebase_path("$prefix/libc++abi/$include", root_build_dir),
+    ]
+  }
+}