From 3a74eff481f37975e04f00db4923b1c16f93497d Mon Sep 17 00:00:00 2001 From: Fabrice Fontaine 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 '' 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 '' 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 --- 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 ], [ extern char *__progname; printf("%s", __progname); ], [ ac_cv_libc_defines___progname="yes" ], [ ac_cv_libc_defines___progname="no" ]