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autotools: recognize more Linux targets when setting -D_GNU_SOURCE

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To set `-D_GNU_SOURCE`.

Required to declare `accept4` on uclibc targets. `host_os` can have
the value `uclinux-uclibcgnueabi` in this case.

Fixing:
```
cf-socket.c: In function 'cf_tcp_accept_connect':
cf-socket.c:2141:18: error: implicit declaration of function 'accept4'; did you mean 'accept'? [-Werror=implicit-function-declaration]
 2141 |     s_accepted = accept4(ctx->sock, (struct sockaddr *) &add, &size,
```

Follow-up to 3d02872be7 #16979

Reported-by: Kadambini Nema
Fixes #17512
Closes #17524
This commit is contained in:
Viktor Szakats 2025-06-03 00:38:20 +02:00
parent f6ab4c8b75
commit 741748e341
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configure.ac
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@ -592,7 +592,7 @@ AM_CONDITIONAL(BUILD_UNITTESTS, test x$supports_unittests = xyes)
# In order to detect support of sendmmsg() and accept4(), we need to escape the POSIX
# jail by defining _GNU_SOURCE or <sys/socket.h> will not expose it.
case $host_os in
linux*|cygwin*|msys*)
*linux*|cygwin*|msys*)
CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
;;
esac