From: Florian Weimer <fweimer@redhat.com>
To: gcc@gcc.gnu.org
Cc: Jonathan Yong <10walls@gmail.com>, Jan Hubicka <hubicka@ucw.cz>,
Nathan Sidwell <nathan@acm.org>
Subject: libgcov, fork, and mingw (and other targets without the full POSIX set)
Date: Fri, 01 Dec 2023 09:02:55 +0100 [thread overview]
Message-ID: <878r6es634.fsf@oldenburg.str.redhat.com> (raw)
I've received a report of a mingw build failure:
../../../gcc/libgcc/libgcov-interface.c: In function '__gcov_fork':
../../../gcc/libgcc/libgcov-interface.c:185:9: error: implicit declaration of function 'fork' [-Wimplicit-function-declaration]
185 | pid = fork ();
| ^~~~
make[2]: *** [Makefile:932: _gcov_fork.o] Error 1
make[2]: *** Waiting for unfinished jobs....
As far as I understand it, mingw doesn't have fork and doesn't declare
it in <unistd.h>, so it's not clear to me how this has ever worked. I
would expect a linker failure. Maybe that doesn't happen because the
object containing a reference to fork is only ever pulled in if the
application calls the intercepted fork, which doesn't happen on mingw.
What's the best way to fix this? I expect it's going to impact other
targets (perhaps for different functions) because all of
libgcov-interface.c is built unconditionally. I don't think we run
configure for the target, so we can't simply check for a definition of
the HAVE_FORK macro.
Thanks,
Florian
next reply other threads:[~2023-12-01 8:03 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-01 8:02 Florian Weimer [this message]
2023-12-01 8:19 ` Eli Zaretskii
2023-12-01 9:00 ` LIU Hao
2023-12-01 9:16 ` Alexander Monakov
2023-12-01 8:42 ` Richard Biener
2023-12-01 8:57 ` Florian Weimer
2023-12-01 9:09 ` Richard Biener
2023-12-01 9:23 ` LIU Hao
2023-12-01 9:23 ` Alexander Monakov
2023-12-01 10:48 ` Andreas Schwab
2023-12-01 12:03 ` Jan Hubicka
2023-12-01 12:09 ` Jakub Jelinek
2023-12-07 12:50 ` Mark Wielaard
2023-12-08 13:59 ` Florian Weimer
2023-12-10 9:27 ` LIU Hao
2023-12-11 6:48 ` Florian Weimer
2023-12-08 8:53 Julian Waters
2023-12-11 12:38 Julian Waters
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