mirror of
https://gitlab.com/buildroot.org/buildroot.git
synced 2026-09-26 03:50:44 -09:00
8242797d31
enscript currently fails to build with musl with gcc >= 15. In order
to fix this, we need to bring a number of patches from upstream, and
add 2 others that were submitted upstream.
From upstream, we bring
0002-Add-CFLAG-std-c89-so-it-compiles-with-the-old-standa.patch, which
switches to -std=c89 to get the compiler back to "old" behavior.
However, as this commit patches configure.ac, we need to autoreconf,
but autoreconf is broken, so we also take
0003-Automake-1.12-and-up-no-longer-supports-pre-ANSI.patch from
upstream, which drops a problematic autoconf macro.
However, once you drop this problematic autoconf macro, the PROTOTYPES
define is never set by anything, causing the __P macro to no longer be
defined properly. This is fixed by
0004-Fix-prototype-detection-when-__STDC__-is-defined-but.patch that
we have submitted upstream.
Once you're there, you realize that switching to -std=c89 has the side
effect that musl's <limits.h> no longer defines PATH_MAX, because it
needs one of:
#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
and a side effect of -std=c89 is that none of these is defined
anymore. So we introduce 0005-Use-std-gnu89-instead-of-std-c89.patch,
which switches to -std=gnu89. This patch has also been submitted
upstream.
With all of these efforts, we get a successful build on musl with gcc
>= 15.
This commit needs to be backported to Buildroot versions that support
gcc 15.x, so that means the currently maintained 2026.x branches, but
not 2025.02 as only up to gcc 14.x was supported then.
Fixes:
https://autobuild.buildroot.org/results/d39d14bbbb3a51d67fe962b877c7f66ff1204ecf/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit edffc0bc50)
Signed-off-by: Titouan Christophe <titouan.christophe@mind.be>
36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
From be920933dbe1fb73c27fecb280200f6f06abfdc2 Mon Sep 17 00:00:00 2001
|
|
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
|
|
Date: Sat, 22 Aug 2026 15:19:17 +0200
|
|
Subject: [PATCH] Use -std=gnu89 instead of -std=c89
|
|
|
|
-std=c89 suppresses feature test macros, which causes <limits.h> to
|
|
not define PATH_MAX on certain C libraries (e.g. musl). Using
|
|
-std=gnu89 enables _GNU_SOURCE and other extensions, ensuring
|
|
PATH_MAX and other POSIX constants are available.
|
|
|
|
This most notably fixes the build with the musl C library.
|
|
|
|
Upstream: https://savannah.gnu.org/bugs/index.php?68634
|
|
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
|
|
---
|
|
configure.ac | 3 ++-
|
|
1 file changed, 2 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/configure.ac b/configure.ac
|
|
index 4431cb1..46ea59d 100644
|
|
--- a/configure.ac
|
|
+++ b/configure.ac
|
|
@@ -11,7 +11,8 @@ AC_PROG_INSTALL
|
|
AC_PROG_CC
|
|
|
|
# Force C89 standard and fix modern GCC global variable handling
|
|
-CFLAGS="$CFLAGS -std=c89"
|
|
+# Use GNU89 to access PATH_MAX in <limits.h>
|
|
+CFLAGS="$CFLAGS -std=gnu89"
|
|
|
|
AC_USE_SYSTEM_EXTENSIONS
|
|
|
|
--
|
|
2.55.0
|
|
|