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Re: [PATCH] configure: Check -falign-jumps=1 -falign-functions=1 beside

From: Fangrui Song
Subject: Re: [PATCH] configure: Check -falign-jumps=1 -falign-functions=1 beside -falign-loops=1
Date: Mon, 23 Aug 2021 23:03:05 -0700

Hi Paul,

Thank you for your suggestions. I just sent v2
with a further cleanup.

On 2021-08-24, Paul Menzel wrote:
Dear Fangrui,

Am 16.08.21 um 21:06 schrieb Fangrui Song via Grub-devel:
Clang 14.0.0 has implemented -falign-loops=1 but -falign-jumps=1 is
still unsupported. The check should test all flags which may be added

“alignment” flags?


into CFLAGS.

Signed-off-by: Fangrui Song <>
--- | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ b/
index bee28dbeb..b2fd0c3e4 100644
--- a/
+++ b/
@@ -799,14 +799,14 @@ 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"
+    CFLAGS="$TARGET_CFLAGS -falign-jumps=1 -falign-loops=1 -falign-functions=1 

I guess the `AC_CACHE_CHECK` description needs to be updated too?

Please mention in the commit message, why a separate check for each switch is not useful.


   AC_CACHE_CHECK([whether -malign-loops works], [grub_cv_cc_malign_loop], [
-    CFLAGS="$TARGET_CFLAGS -malign-loops=1 -Werror"
+    CFLAGS="$TARGET_CFLAGS -malign-jumps=1 -malign-loops=1 -malign-functions=1 

When you sent the v2, please include the maintainers listed in `MAINTAINERS` in the recipient list.


Kind regards,


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