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3 Commits

Author SHA1 Message Date
Ken Matsui a1545f51a9 Warn if using `elifdef` & `elifndef` in not C2x & C++2b mode 
This adds an extension warning when using the preprocessor conditionals
in a language mode they're not officially supported in, and an opt-in
warning for compatibility with previous standards.

Fixes #55306
Differential Revision: https://reviews.llvm.org/D125178
 2022-05-12 09:26:44 -04:00
Aaron Ballman baa2b8d085 Fix a git apply that went bad somehow. 
When applying the changes in 8edd3464af,
it seems that this bit got merged incorrectly and no test coverage
caught the issue. This fixes the diagnostic and adds a test.
 2021-06-01 14:06:39 -04:00
Aaron Ballman 8edd3464af Add support for #elifdef and #elifndef 
WG14 adopted N2645 and WG21 EWG has accepted P2334 in principle (still
subject to full EWG vote + CWG review + plenary vote), which add
support for #elifdef as shorthand for #elif defined and #elifndef as
shorthand for #elif !defined. This patch adds support for the new
preprocessor directives.
 2021-05-27 08:57:47 -04:00