[Buildroot] [PATCH] package/m4: fix build failure with gcc 15

[Buildroot] [PATCH] package/m4: fix build failure with gcc 15

[Joseph Zikusooka]

From 08d03e3ac14325a05942a632c8cf7b2a7c06d880 Mon Sep 17 00:00:00 2001
From: "Joseph Zikusooka (ZIK)" <zik@jambula.net>
Date: Wed, 23 Apr 2025 15:53:56 +0300
Subject: [PATCH] package/m4: fix build failure with gcc 15

This is a temporary workaround to address build issues with host-m4
when using GCC 15, as encountered on
the recently released Fedora 42. The issue stems from stricter
compiler behavior introduced in recent
bersions of GCC.

A proper fix has already been committed upstream and will be included
in the next release of GNU m4:
https://git.savannah.gnu.org/cgit/m4.git/commit/?h=branch-1.4&id=a22c9802dd7e724eaefb21dc21d84ac2d3a49c89

Until that version is available in buildroot, this patch ensures
continued compatibility and successful
builds.

More context:
https://lists.buildroot.org/pipermail/buildroot/2025-April/776922.html

Signed-off-by: Joseph Zikusooka (ZIK) <zik@jambula.net>
---
 package/m4/m4.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/package/m4/m4.mk b/package/m4/m4.mk
index 39ad898b10..ab8e194b06 100644
--- a/package/m4/m4.mk
+++ b/package/m4/m4.mk
@@ -10,4 +10,6 @@ M4_SITE = $(BR2_GNU_MIRROR)/m4
 M4_LICENSE = GPL-3.0+
 M4_LICENSE_FILES = COPYING

+HOST_M4_CONF_ENV = CFLAGS="$(HOST_CFLAGS) -std=gnu17"
+
 $(eval $(host-autotools-package))
-- 
2.49.0
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Re: [Buildroot] [PATCH] package/m4: fix build failure with gcc 15

[François Foltête via buildroot]

Hello Joseph,

thanks for the patch, it worked for me.

Tested-by: Francois Foltete <francois.foltete@bootlin.com>

-- 
François Foltête, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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Re: [Buildroot] [PATCH] package/m4: fix build failure with gcc 15

[Joseph Zikusooka]

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Glad it worked for you - Thanks for letting me know!

Joseph Zikusooka (ZIK)

On Wed, Apr 30, 2025, 6:00 PM François Foltête <francois.foltete@bootlin.com>
wrote:

> Hello Joseph,
>
> thanks for the patch, it worked for me.
>
> Tested-by: Francois Foltete <francois.foltete@bootlin.com>
>
> --
> François Foltête, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>

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[-- Attachment #2: Type: text/plain, Size: 150 bytes --]

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Re: [Buildroot] [PATCH] package/m4: fix build failure with gcc 15

[Luca Ceresoli via buildroot]

On Wed, 23 Apr 2025 16:57:27 +0300
Joseph Zikusooka <josephzik@gmail.com> wrote:

> From 08d03e3ac14325a05942a632c8cf7b2a7c06d880 Mon Sep 17 00:00:00 2001
> From: "Joseph Zikusooka (ZIK)" <zik@jambula.net>
> Date: Wed, 23 Apr 2025 15:53:56 +0300
> Subject: [PATCH] package/m4: fix build failure with gcc 15
> 
> This is a temporary workaround to address build issues with host-m4
> when using GCC 15, as encountered on
> the recently released Fedora 42. The issue stems from stricter
> compiler behavior introduced in recent
> bersions of GCC.
  ^
"versions"

> A proper fix has already been committed upstream and will be included
> in the next release of GNU m4:
> https://git.savannah.gnu.org/cgit/m4.git/commit/?h=branch-1.4&id=a22c9802dd7e724eaefb21dc21d84ac2d3a49c89
> 
> Until that version is available in buildroot, this patch ensures
> continued compatibility and successful
> builds.
> 
> More context:
> https://lists.buildroot.org/pipermail/buildroot/2025-April/776922.html
> 
> Signed-off-by: Joseph Zikusooka (ZIK) <zik@jambula.net>

Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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