Eric Fiselier 5fe8797d57 Improve test runner output for broken configurations. ...

Previously LIT would often fail while attempting to set up/configure
the test compiler; normally when attempting to dump the builtin macros.
This sort of failure provided no useful information about what went
wrong with the compiler, making the actual issues hard --- if not
impossible --- to debug easily.

This patch changes the LIT configuration to report the failure explicitly,
including the failed compile command and the stdout/stderr output.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@314735 91177308-0d34-0410-b5e6-96231b3b80d8

2017-10-02 22:52:51 +00:00

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