package/autossh/0001-configure.ac-fix-__progname-check-with-gcc-14.patch

From 3a74eff481f37975e04f00db4923b1c16f93497d Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Sat, 20 Jul 2024 16:06:37 +0200
Subject: [PATCH] configure.ac: fix __progname check with gcc >= 14

Include stdio.h to avoid that __progname check wrongly returns that
the function is unavailable with gcc >= 14 which enables
-Werror=implicit-function-declaration
(https://gcc.gnu.org/gcc-14/porting_to.html):

configure:5231: checking if libc defines __progname
configure:5249: /home/autobuild/autobuild/instance-7/output-1/host/bin/sh4-buildroot-linux-musl-gcc -o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0  -static -Wall -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -static conftest.c  >&5
conftest.c: In function 'main':
conftest.c:73:27: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   73 |  extern char *__progname; printf("%s", __progname);
      |                           ^~~~~~
conftest.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
    1 | /* confdefs.h */
conftest.c:73:27: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
   73 |  extern char *__progname; printf("%s", __progname);
      |                           ^~~~~~
conftest.c:73:27: note: include '<stdio.h>' or provide a declaration of 'printf'

resulting in the following static build failure:

/home/autobuild/autobuild/instance-7/output-1/host/lib/gcc/sh4-buildroot-linux-musl/14.1.0/../../../../sh4-buildroot-linux-musl/bin/ld: /home/autobuild/autobuild/instance-7/output-1/host/sh4-buildroot-linux-musl/sysroot/lib/libc.a(libc.o):(.bss.__progname+0x0): multiple definition of `__progname'; autossh.o:(.bss+0x120): first defined here

Fixes:
 - http://autobuild.buildroot.org/results/5d80a8096d0f5529cbd86903a74f3bab3d230f4a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Upstream: https://github.com/Autossh/autossh/pull/9
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 4bb9380..dadb523 100644
--- a/configure.ac
+++ b/configure.ac
@@ -132,7 +132,7 @@ AC_CHECK_LIB(socket, connect)
 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 AC_CACHE_CHECK([if libc defines __progname], ac_cv_libc_defines___progname, [
-	AC_TRY_LINK([],
+	AC_TRY_LINK([ #include <stdio.h> ],
 		[ extern char *__progname; printf("%s", __progname); ],
 		[ ac_cv_libc_defines___progname="yes" ],
 		[ ac_cv_libc_defines___progname="no" ]
-- 
2.43.0