[PATCH] D39412: [Driver] Give LIBRARY_PATH precedence over native toolchains

[Zhihao Yuan via Phabricator via cfe-commits]

lichray created this revision.
Herald added subscribers: aheejin, jgravelle-google, sbc100, nhaehnle, dschuff, jfb, emaste.

`LIBRARY_PATH` expansion should happen before expanding native toolchains' linker arguments, if any, to allow overriding the default standard libraries to link.  GCC supports this practice as well.

Factor the code expanding `LIBRARY_PATH` out of `AddLinkerInputs` into `AddLibraryPaths` add let the platform-specific code decide the appropriate order for these flags.

Fixes: https://bugs.llvm.org/show_bug.cgi?id=16786


https://reviews.llvm.org/D39412

Files:
  lib/Driver/ToolChains/AMDGPU.cpp
  lib/Driver/ToolChains/AVR.cpp
  lib/Driver/ToolChains/Ananas.cpp
  lib/Driver/ToolChains/BareMetal.cpp
  lib/Driver/ToolChains/CloudABI.cpp
  lib/Driver/ToolChains/CommonArgs.cpp
  lib/Driver/ToolChains/CommonArgs.h
  lib/Driver/ToolChains/CrossWindows.cpp
  lib/Driver/ToolChains/Darwin.cpp
  lib/Driver/ToolChains/DragonFly.cpp
  lib/Driver/ToolChains/FreeBSD.cpp
  lib/Driver/ToolChains/Fuchsia.cpp
  lib/Driver/ToolChains/Gnu.cpp
  lib/Driver/ToolChains/Hexagon.cpp
  lib/Driver/ToolChains/MinGW.cpp
  lib/Driver/ToolChains/Minix.cpp
  lib/Driver/ToolChains/Myriad.cpp
  lib/Driver/ToolChains/NaCl.cpp
  lib/Driver/ToolChains/NetBSD.cpp
  lib/Driver/ToolChains/OpenBSD.cpp
  lib/Driver/ToolChains/PS4CPU.cpp
  lib/Driver/ToolChains/Solaris.cpp
  lib/Driver/ToolChains/WebAssembly.cpp
  lib/Driver/ToolChains/XCore.cpp

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