[PATCH v2] configure: Check -falign-jumps=1 -falign-functions=1 beside -falign-loops=1

[Fangrui Song]

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.

While here, remove checks for the obsoleted -malign-* forms.
GCC has supported the preferred -falign-* forms since 3.2.

Signed-off-by: Fangrui Song <maskray@google.com>
---
 configure.ac | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/configure.ac b/configure.ac
index bee28dbeb..8625e6776 100644
--- a/configure.ac
+++ b/configure.ac
@@ -798,24 +798,16 @@ 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])
   ])
 
-  AC_CACHE_CHECK([whether -malign-loops works], [grub_cv_cc_malign_loop], [
-    CFLAGS="$TARGET_CFLAGS -malign-loops=1 -Werror"
-    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
-        [grub_cv_cc_malign_loop=yes],
-       [grub_cv_cc_malign_loop=no])
-  ])
-
   if test "x$grub_cv_cc_falign_loop" = xyes; then
     TARGET_CFLAGS="$TARGET_CFLAGS -falign-jumps=1 -falign-loops=1 
-falign-functions=1"
-  elif test "x$grub_cv_cc_malign_loop" = xyes; then
-    TARGET_CFLAGS="$TARGET_CFLAGS -malign-jumps=1 -malign-loops=1 
-malign-functions=1"
   fi
 fi
 
-- 
2.33.0.rc2.250.ged5fa647cd-goog