[PATCH] apr: remove -std=gnu23 from apr_rules.mk to fix reproducibility

[PATCH] apr: remove -std=gnu23 from apr_rules.mk to fix reproducibility

[martin.jansa]

From: Martin Jansa <martin.jansa@gmail.com>

With the updated ax_prog_cc_for_build.m4 from
apr: fix build with autoconf-2.73
it now correctly detects -std=gnu23 usability on host gcc and doesn't
try to use it e.g. with gcc-13 which doesn't support it, but that causes
build reproducibility issue between builds on such hosts as
CC_FOR_BUILD is included in installed /usr/share/build-1/apr_rules.mk
https://valkyrie.yocto.io/pub/repro-fail/oe-reproducible-20260412-a5w4mcrk/packages/diff-html/

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
---
 meta/recipes-support/apr/apr_1.7.6.bb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/recipes-support/apr/apr_1.7.6.bb b/meta/recipes-support/apr/apr_1.7.6.bb
index 86fac1e4c8..9a7a8ddd74 100644
--- a/meta/recipes-support/apr/apr_1.7.6.bb
+++ b/meta/recipes-support/apr/apr_1.7.6.bb
@@ -87,6 +87,8 @@ do_configure:append() {
 do_install:append() {
 	oe_multilib_header apr.h
 	install -d ${D}${datadir}/apr
+	# avoid reproducibility issue, -std=gnu23 is used only on hosts with gcc-14 and newer
+	sed -i '/^CC_FOR_BUILD=/s/-std=gnu23//g' ${D}${datadir}/build-1/apr_rules.mk
 }
 
 do_install:append:class-target() {

Re: [OE-core] [PATCH] apr: remove -std=gnu23 from apr_rules.mk to fix reproducibility

[Mathieu Dubois-Briand]

On Sun Apr 12, 2026 at 12:57 PM CEST, Martin Jansa via lists.openembedded.org wrote:
> From: Martin Jansa <martin.jansa@gmail.com>
>
> With the updated ax_prog_cc_for_build.m4 from
> apr: fix build with autoconf-2.73
> it now correctly detects -std=gnu23 usability on host gcc and doesn't
> try to use it e.g. with gcc-13 which doesn't support it, but that causes
> build reproducibility issue between builds on such hosts as
> CC_FOR_BUILD is included in installed /usr/share/build-1/apr_rules.mk
> https://valkyrie.yocto.io/pub/repro-fail/oe-reproducible-20260412-a5w4mcrk/packages/diff-html/
>
> Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
> ---

This fix got merged, but it looks like this is not enough: we sometimes
have a whitespace diff, like on this build:

https://valkyrie.yocto.io/pub/repro-fail/oe-reproducible-20260414-82oogy25/packages/diff-html/

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com