[PATCH] D134270: [clang] [Driver] Support multiple configuration files

[Michał Górny via Phabricator via cfe-commits]

mgorny created this revision.
mgorny added reviewers: sepavloff, MaskRay.
Herald added a subscriber: StephenFan.
Herald added a project: All.
mgorny requested review of this revision.

Support specifying multiple configuration files via multiple `--config`
options.  When multiple files are specified, the options from subsequent
files are appended to the options from the initial file.

While at it, remove the incorrect assertion about CfgFileName being
non-empty.  It can be empty if `--config ""` is passed, and it makes
sense to report it as non-existing file rather than crash.


https://reviews.llvm.org/D134270

Files:
  clang/include/clang/Driver/Driver.h
  clang/lib/Driver/Driver.cpp
  clang/test/Driver/config-file-errs.c
  clang/test/Driver/config-file.c

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