chromium: Use libcxx runtime for native binaries

This patch enables using llvm runtime instead of standard gnu runtime
even on native binaries which are built during build, helps avoid
depending on libstdc++ completely for chromium build

Fix will complete kraj/meta-clang#449
please note that it will need master branch of meta-clang and
is not backportable to older releases

Signed-off-by: Khem Raj <[email protected]>

Author: kraj

meta-chromium/recipes-browser/chromium/chromium-gn.inc

@@ -60,8 +60,6 @@ DEPENDS += " \
     atk \
     bison-native \
     cairo \
-    curl \
-    dbus \
     expat \
     flac \
     freetype \
@@ -86,6 +84,7 @@ DEPENDS += " \
     qemu-native \
     virtual/libgl \
 "
+DEPEND_append_runtime-llvm = " compiler-rt-native libcxx-native"
 
 # The wrapper script we use from upstream requires bash.
 RDEPENDS_${PN} = "bash"
@@ -254,6 +253,11 @@ GN_ARGS += ' \
         google_default_client_secret="${GOOGLE_DEFAULT_CLIENT_SECRET}" \
 '
 
+# Use libcxx headers for native parts
+BUILD_CPPFLAGS_append_rumtime-llvm = " -isysroot=${STAGING_DIR_NATIVE} -stdlib=libc++"
+# Use libgcc for native parts
+BUILD_LDFLAGS_append_runtime-llvm = " -rtlib=libgcc -unwindlib=libgcc -stdlib=libc++ -lc++abi -rpath ${STAGING_LIBDIR_NATIVE}"
+
 # Toolchains we will use for the build. We need to point to the toolchain file
 # we've created, set the right target architecture and make sure we are not
 # using Chromium's toolchain (bundled clang, bundled binutils etc).