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-frewrite-includes.
Remove the special-case (and highly implausible) diagnostic for a
compound token that crosses a file boundary, and instead model that case
the same as a compound token separated by whitespace, so that file
transitions and presumed file transitions behave the same way.
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Use of a linebreak between the `(` and `{` in a GNU statement-expression
appears to be too common to include this warning in -Wall -- this occurs
in some Linux kernel headers, for example.
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expansions or split by whitespace.
For example:
#define FOO(x) (x)
FOO({});
... forms a statement-expression after macro expansion. This warning
applies to '({' and '})' delimiting statement-expressions, '[[' and ']]'
delimiting attributes, and '::*' introducing a pointer-to-member.
The warning for forming these compound tokens across macro expansions
(or across files!) is enabled by default; the warning for whitespace
within the tokens is not, but is included in -Wall.
Differential Revision: https://reviews.llvm.org/D86751
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