[PATCH] D159293: [driver] Perform fallback target searches for stdlib

[Shoaib Meenai via Phabricator via cfe-commits]

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Searching for target-specific standard library header and library paths
should perform fallback searches for targets, the same way searching for
the runtime libraries does. It's important for the header and library
searches to be consistent, otherwise we could end up using mismatched
headers and libraries. (See also https://reviews.llvm.org/D146664.)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159293

Files:
  clang/include/clang/Driver/ToolChain.h
  clang/lib/Driver/ToolChain.cpp
  clang/lib/Driver/ToolChains/Fuchsia.cpp
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/lib/Driver/ToolChains/VEToolchain.cpp
  clang/test/Driver/Inputs/basic_android_libcxx_tree/usr/bin/.keep
  clang/test/Driver/Inputs/basic_android_libcxx_tree/usr/lib/aarch64-unknown-linux-android/libc++.so
  clang/test/Driver/Inputs/basic_android_libcxx_tree/usr/lib/aarch64-unknown-linux-android21/libc++.so
  clang/test/Driver/android-installed-libcxx.cpp
  clang/test/Driver/linux-per-target-runtime-dir.c

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