[Buildroot] [PATCH 1/1] package/libdill: fix build with gcc-15.x

[Buildroot] [PATCH 1/1] package/libdill: fix build with gcc-15.x

[Bernd Kuhls]

Updated project URL: https://github.com/sustrik/libdill/pull/228

Adding -std=gnu17 was recommended in upstream PR:
https://github.com/sustrik/libdill/issues/229#issuecomment-2865524080

Fixes:
https://autobuild.buildroot.net/results/1a5/1a5e9d7df6c83a921cae39b4dc4b601be4d18e36/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
 package/libdill/Config.in  | 2 +-
 package/libdill/libdill.mk | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/package/libdill/Config.in b/package/libdill/Config.in
index 2376fc9698..ec649c6600 100644
--- a/package/libdill/Config.in
+++ b/package/libdill/Config.in
@@ -4,4 +4,4 @@ config BR2_PACKAGE_LIBDILL
 	  Libdill is a C library that makes writing structured
 	  concurrent programs easy.
 
-	  http://libdill.org
+	  https://sustrik.github.io/libdill/
diff --git a/package/libdill/libdill.mk b/package/libdill/libdill.mk
index 9dda81d085..e68ee819ec 100644
--- a/package/libdill/libdill.mk
+++ b/package/libdill/libdill.mk
@@ -12,6 +12,13 @@ LIBDILL_INSTALL_STAGING = YES
 # Fetched from Github, with no configure script
 LIBDILL_AUTORECONF = YES
 
+# gcc-15 defaults to -std=gnu23 which introduces build failures.
+# We force "-std=gnu17" for gcc version supporting it. Earlier gcc
+# versions will work, since they are using the older standard.
+ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
+LIBDILL_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -std=gnu17"
+endif
+
 ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
 LIBDILL_CONF_OPTS += --enable-threads
 else
-- 
2.47.3

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Re: [Buildroot] [PATCH 1/1] package/libdill: fix build with gcc-15.x

[Thomas Petazzoni via buildroot]

Hello Bernd,

On Sun, 26 Oct 2025 15:39:16 +0100
Bernd Kuhls <bernd@kuhls.net> wrote:

> Updated project URL: https://github.com/sustrik/libdill/pull/228

This should have been a separate commit.

> Adding -std=gnu17 was recommended in upstream PR:
> https://github.com/sustrik/libdill/issues/229#issuecomment-2865524080
> 
> Fixes:
> https://autobuild.buildroot.net/results/1a5/1a5e9d7df6c83a921cae39b4dc4b601be4d18e36/
> 
> Signed-off-by: Bernd Kuhls <bernd@kuhls.net>

I wanted to test your patch, but libdill doesn't build for me, even
before the gcc 15.x issue, I get an issue during autoreconf:

configure.ac:59: warning: The macro 'AC_PROG_CC_C99' is obsolete.
configure.ac:59: You should run autoupdate.
./lib/autoconf/c.m4:1662: AC_PROG_CC_C99 is expanded from...
configure.ac:59: the top level
configure.ac:210: warning: AC_OUTPUT should be used without arguments.
configure.ac:210: You should run autoupdate.
configure.ac:119: error: possibly undefined macro: AC_CHECK_LIB
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:127: error: possibly undefined macro: AC_MSG_ERROR
autoreconf: error: /home/thomas/projets/buildroot/output-dill/host/bin/autoconf failed with exit status: 1
make: *** [package/pkg-generic.mk:262: /home/thomas/projets/buildroot/output-dill/build/libdill-32d0e8b733416208e0412a56490332772bc5c6e1/.stamp_configured] Error 1
make: Leaving directory '/home/thomas/projets/buildroot'

I would suggest to drop the package. Last tag in February 2019, last
commit in Aug 2022 (and it was following a patch submitted by Fabrice
Fontaine), and before that previous commit in 2021. Lots of issues
opened.

So I think dropping the package is the right thing to do. Do you want
to send such a patch?

Thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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