[Bug 257866] security/sssd: Build fails compiling nss_sha512crypt.c: static declaration of 'mempcpy' follows non-static declaration

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 13 Oct 2021 20:41:23 UTC

Mikhail Teterin <mi@FreeBSD.org> changed:

           What    |Removed                     |Added
                 CC|                            |mi@FreeBSD.org
 Attachment #228679|                            |maintainer-approval?
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--- Comment #3 from Mikhail Teterin <mi@FreeBSD.org> ---
Created attachment 228679
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228679&action=edit
Check for mempcpy

The root cause of the problem is that FreeBSD-13.0 has mempcpy(3) in libc --
and declared in <string.h>, whereas the earlier versions did not.

There are several other ports affected -- chromium among them (Bug #257352).
The earlier solutions simply grep-ed /usr/include/string.h for mempcpy.

Here I'm offering a different approach -- test for the function's using
configure. It has the advantage of being (potentially) acceptable upstream.

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