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From: Paul Menzel <pmenzel@molgen.mpg.de>
To: "Fāng-ruì Sòng" <maskray@google.com>
Cc: grub-devel@gnu.org, Daniel Kiper <daniel.kiper@oracle.com>,
	Alex Burmashev <alexander.burmashev@oracle.com>,
	Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Subject: Re: [PATCH 2/2] configure: Check -falign-jumps=1 -falign-functions=1 beside -falign-loops=1
Date: Tue, 24 Aug 2021 08:25:15 +0200	[thread overview]
Message-ID: <7f83107f-fcf7-9225-26b4-0180badb18b1@molgen.mpg.de> (raw)
In-Reply-To: <20210824061838.3569412-3-maskray@google.com>

Dear Fāng-ruì,


Am 24.08.21 um 08:18 schrieb Fangrui Song via Grub-devel:
> Clang does not support -falign-jumps and only recently gained support
> for -falign-loops. Test all the alignment options to avoid passing
> unrecognized options to Clang:
> 
>      clang-14: error: optimization flag '-falign-jumps=1' is not supported [-Werror,-Wignored-optimization-argument]
> 
> When compiled with older Clang, the alignment options are not added, so
> just avoid the complexity for each option.
> 
> Signed-off-by: Fangrui Song <maskray@google.com>
> ---
>   configure.ac | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/configure.ac b/configure.ac
> index 9a12151bd..8625e6776 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -798,8 +798,9 @@ fi
>   
>   # Force no alignment to save space on i386.
>   if test "x$target_cpu" = xi386; then
> -  AC_CACHE_CHECK([whether -falign-loops works], [grub_cv_cc_falign_loop], [
> -    CFLAGS="$TARGET_CFLAGS -falign-loops=1 -Werror"
> +  AC_CACHE_CHECK([whether -falign-jumps=1 -falign-loops=1 -falign-functions=1 works],
> +    [grub_cv_cc_falign_loop], [
> +    CFLAGS="$TARGET_CFLAGS -falign-jumps=1 -falign-loops=1 -falign-functions=1 -Werror"
>       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
>           [grub_cv_cc_falign_loop=yes],
>   	[grub_cv_cc_falign_loop=no])
> 

Acked-by: Paul Menzel <pmenzel@molgen.mpg.de>


Kind regards,

Paul


  reply	other threads:[~2021-08-24  6:25 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24  6:18 [PATCH 0/2] configure: Remove -malign-* and fix Clang 14 breakage Fangrui Song
2021-08-24  6:18 ` [PATCH 1/2] configure: Remove obsoleted -malign-{jumps, loops, functions} Fangrui Song
2021-08-24  6:24   ` Paul Menzel
2021-08-25 13:19     ` Daniel Kiper
2021-08-24  6:18 ` [PATCH 2/2] configure: Check -falign-jumps=1 -falign-functions=1 beside -falign-loops=1 Fangrui Song
2021-08-24  6:25   ` Paul Menzel [this message]
2021-08-25 13:24   ` Daniel Kiper
2021-08-25 16:34     ` Fangrui Song
2021-08-26 14:13       ` Daniel Kiper

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