[Buildroot] [git commit branch/2026.05.x] package/openssh: fix build for powerpc64le

commit: https://gitlab.com/buildroot.org/buildroot/-/commit/377bd40298eed7134ba39002e046bbf2455147ac
branch: https://gitlab.com/buildroot.org/buildroot/-/tree/2026.05.x

Fixes:
https://autobuild.buildroot.net/results/40a/40a26d9831667233944e6aabf2388f02a8cf30ac/
https://gitlab.com/buildroot.org/buildroot/-/work_items/79

packet.c: In function 'ssh_packet_log_type':
packet.c:1219:1: sorry, unimplemented: argument 'used' is not supported
 for '-fzero-call-used-regs' on this target

Upstream bug report: https://bugzilla.mindrot.org/show_bug.cgi?id=3673

Upstream commit
https://github.com/openssh/openssh-portable/commit/29cf521486bf97ab9de5b9b356f812107e0671bc
which was first released with version 10.1 and was added to buildroot
with commit b52b3fd59dc6c86ef51b6cad5b76017f90c83beb introduced cache
variables to disable zero-call-used-regs when needed.

Signed-off-by: Bernd Kuhls <[email protected]>
Signed-off-by: Julien Olivain <[email protected]>
(cherry picked from commit a44b18837dc54504f25139d7a3e571cb67cbc9c4)
Signed-off-by: Thomas Perale <[email protected]>
---
 package/openssh/openssh.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/openssh/openssh.mk b/package/openssh/openssh.mk
index 2f3088defe..5575ba4f97 100644
--- a/package/openssh/openssh.mk
+++ b/package/openssh/openssh.mk
@@ -36,6 +36,10 @@ define OPENSSH_PERMISSIONS
 	/var/empty d 755 root root - - - - -
 endef
 
+ifeq ($(BR2_powerpc64le),y)
+OPENSSH_CONF_ENV += ossh_cv_cflag__fzero_call_used_regs_used=no
+endif
+
 ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_110934),y)
 OPENSSH_CONF_OPTS += --without-hardening
 endif
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