[Buildroot] [PATCH 1/1] boot/syslinux: fix build with gcc-15.x

[Buildroot] [PATCH 1/1] boot/syslinux: fix build with gcc-15.x

[Bernd Kuhls]

Fixes build error with gcc-15.x:

drivers/net/3c509-eisa.c:39:26: error:  initialization of 'void (*)(void)'
 from incompatible pointer type 'void (*)(struct nic *, struct eisa_device *)'
 [-Wincompatible-pointer-types]

For a similar fix see https://bugzilla.suse.com/show_bug.cgi?id=1243225

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
 boot/syslinux/syslinux.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/boot/syslinux/syslinux.mk b/boot/syslinux/syslinux.mk
index 127f6b3cc1..b8f022b189 100644
--- a/boot/syslinux/syslinux.mk
+++ b/boot/syslinux/syslinux.mk
@@ -65,7 +65,7 @@ define SYSLINUX_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE1) \
 		ASCIIDOC_OK=-1 \
 		A2X_XML_OK=-1 \
-		CC="$(TARGET_CC)" \
+		CC="$(TARGET_CC) -std=gnu17" \
 		LD="$(TARGET_LD)" \
 		OBJCOPY="$(TARGET_OBJCOPY)" \
 		AS="$(TARGET_AS)" \
-- 
2.39.5

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

[Julien Olivain via buildroot]

On 30/07/2025 21:01, Bernd Kuhls wrote:
> Fixes build error with gcc-15.x:
> 
> drivers/net/3c509-eisa.c:39:26: error:  initialization of 'void 
> (*)(void)'
>  from incompatible pointer type 'void (*)(struct nic *, struct 
> eisa_device *)'
>  [-Wincompatible-pointer-types]
> 
> For a similar fix see https://bugzilla.suse.com/show_bug.cgi?id=1243225
> 
> Signed-off-by: Bernd Kuhls <bernd@kuhls.net>

Applied to master, thanks.
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Re: [Buildroot] [PATCH 1/1] boot/syslinux: fix build with gcc-15.x

[Thomas Petazzoni via buildroot]

Hello,

On Wed, 30 Jul 2025 21:01:18 +0200
Bernd Kuhls <bernd@kuhls.net> wrote:

> Fixes build error with gcc-15.x:
> 
> drivers/net/3c509-eisa.c:39:26: error:  initialization of 'void (*)(void)'
>  from incompatible pointer type 'void (*)(struct nic *, struct eisa_device *)'
>  [-Wincompatible-pointer-types]
> 
> For a similar fix see https://bugzilla.suse.com/show_bug.cgi?id=1243225
> 
> Signed-off-by: Bernd Kuhls <bernd@kuhls.net>

This change breaks the build with older compilers:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/10975828975

I'm about to send a patch that will update the toolchain used in those
tests, papering over this issue, but I believe it is not normal to
break the build of syslinux with older compilers, such as:

    BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
    BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
    BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.org/toolchains/tarballs/br-i386-pentium4-full-2017.05-1078-g95b1dae.tar.bz2"
    BR2_TOOLCHAIN_EXTERNAL_GCC_6=y
    BR2_TOOLCHAIN_EXTERNAL_HEADERS_3_2=y
    BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
    # BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG is not set
    BR2_TOOLCHAIN_EXTERNAL_CXX=y

Best regards,

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