Eric Fiselier b168a7c660 Fix PR39749 - Headers containing just #error harm __has_include.
This patch changes <experimental/foo> to use #warning instead of
is harmful to common feature detection idioms.

We should also consider only emitting the warning when __DEPRECATED is
defined, like we do in the <ext/foo> headers. Users may want to specify
"-Werror=-W#warnings" while still ignoring the libc++ warnings.

llvm-svn: 350485
2019-01-06 00:37:31 +00:00
..
2018-07-27 03:07:09 +00:00
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