[PATCH] D64089: [Driver] Introduce -stdlib++-isystem

[Shoaib Meenai via Phabricator via cfe-commits]

smeenai added a comment.

In D64089#1576902 <https://reviews.llvm.org/D64089#1576902>, @ldionne wrote:

> Background question: I'm familiar with the behavior on Darwin, where we prefer C++ headers in the toolchain (alongside the driver), however do other platforms behave the same? I thought this was something specific to Darwin.


The Linux toolchain (which is used for non-GNU Linux targets, e.g. Android) also prefers C++ headers in the toolchain: https://github.com/llvm/llvm-project/blob/a6548d04375b49da989103c403d83475cc2f8ce4/clang/lib/Driver/ToolChains/Linux.cpp#L891. There's a FIXME in the GCC toolchain to adopt that behavior too: https://github.com/llvm/llvm-project/blob/a6548d04375b49da989103c403d83475cc2f8ce4/clang/lib/Driver/ToolChains/Gnu.cpp#L2619


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