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Re: [PATCH 2/2] configure: Check -falign-jumps=1 -falign-functions=1 bes

From: Paul Menzel
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
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

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 

When compiled with older Clang, the alignment options are not added, so
just avoid the complexity for each option.

Signed-off-by: Fangrui Song <>
--- | 5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ b/
index 9a12151bd..8625e6776 100644
--- a/
+++ b/
@@ -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 
+    [grub_cv_cc_falign_loop], [
+    CFLAGS="$TARGET_CFLAGS -falign-jumps=1 -falign-loops=1 -falign-functions=1 

Acked-by: Paul Menzel <>

Kind regards,


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