Re: [Buildroot] [PATCH 2/2] package/openssh: fix build on MIPS before R6 at -O0

["Raphaël Mélotte via buildroot" <buildroot@buildroot.org>]

In reply of:
> openssh fails to build on MIPS64 (n32/n64 ABI) before R6 with
> BR2_OPTIMIZE_0:
> 
>   during RTL pass: zero_call_used_regs
>   channels.c: In function 'channel_set_xtype':
>   channels.c:437:1: internal compiler error: in int_mode_for_mode, at stor-layout.cc:408
> 
> Since version 9.6p1, openssh builds with -fzero-call-used-regs=used if
> the compiler supports it. On MIPS before R6, gcc rejects this option or
> ICEs on functions using the hi/lo registers (gcc bug 104820). The
> configure check usually catches this, but at -O0 its test program
> builds fine with n32/n64, so the option ends up being used.
> 
> Disable -fzero-call-used-regs on MIPS before R6, through the configure
> cache variable already used for powerpc64le. This doesn't lose anything,
> as the option is never usable there.
> 
> This issue has been present since commit 3c047ea463e2
> ("package/openssh: security bump to version 9.6p1"), which switched
> from -fzero-call-used-regs=all (always rejected by the configure check
> on MIPS before R6) to -fzero-call-used-regs=used. It therefore affects
> 2024.02 and later, including all maintained branches. The cache
> variable only exists since openssh 10.1, so for branches with an older
> openssh, --without-hardening would be needed instead.
> 
> Fixes:
> https://autobuild.buildroot.org/results/68d260341341afb0dfb7244f641f5196df3649a8
> 
> Fixes: 3c047ea463e27ceaafde76d64406862c3322daa0 ("package/openssh: security bump to version 9.6p1")
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

Applied to 2025.02.x, 2026.08.x. Thanks

> ---
>  package/openssh/openssh.mk | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/package/openssh/openssh.mk b/package/openssh/openssh.mk
> index 6808db9962..a0cd3168e0 100644
> --- a/package/openssh/openssh.mk
> +++ b/package/openssh/openssh.mk
> @@ -36,7 +36,9 @@ define OPENSSH_PERMISSIONS
>  	/var/empty d 755 root root - - - - -
>  endef
>  
> -ifeq ($(BR2_powerpc64le),y)
> +# -fzero-call-used-regs=used is not supported on powerpc64le and makes
> +# gcc ICE on MIPS before R6
> +ifneq ($(BR2_powerpc64le)$(BR2_TOOLCHAIN_HAS_GCC_BUG_104820),)
>  OPENSSH_CONF_ENV += ossh_cv_cflag__fzero_call_used_regs_used=no
>  endif
>  
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