https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261310
Bug ID: 261310
Summary: The libgen.h sources use C11-specific features under
e.g. -std=gnu99, causing a -Wc11-extensions warning
Product: Base System
Version: CURRENT
Hardware: Any
URL: https://lore.kernel.org/git/patch-1.1-06cc12be94d-2022
0118t151234z-ava...@gmail.com/
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: misc
Assignee: b...@freebsd.org
Reporter: ava...@gmail.com
CC: e...@freebsd.org, f...@fuz.su
Created attachment 231131
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=231131&action=edit
"fix" the issue with _Generic() in libgen.h by ignoring -Wc11-extension
The $subject issue was encountered when testing a pre-release of git. I've
submitted a workaround for it in $url.
As noted in $url I think this is a regression in the 2014-era commit by
e...@freebsd.org to sys/cdefs.h
(https://github.com/freebsd/freebsd-src/commit/62b7f85d4749).
Since then the __generic() wrapper for the C11-_Generic() has checked the
__STDC_VERSION__ *or* __has_extension(c_generic_selections). The problem being
that the latter is a way to ask if the compiler supports this at all, and not
whether the current -std=* would emit a warning about it conflicting with the
currently selected C version.
There's probably a less crappy way to solve this, but I can't think of one that
isn't the attached patch. I.e. the issue is that both GCC and Clang don't seem
to have a way to request the C version in effect for the purposes of warnings
being emitted, so we can just quiet the relevant warning. If such a thing
exists I haven't found it.
I'm not sure if FreeBSD still cares about GCC, but if so the added pragma lines
also need duplicated "#pragma GCC...".
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