build: Only use --fatal-warnings if assembler supports it

On Solaris/x86 with the native as, two tests currently FAIL:

FAIL: gcc.dg/tree-ssa/cswtch-6.c scan-assembler .rodata.cst16
FAIL: gcc.dg/tree-ssa/cswtch-7.c scan-assembler .rodata.cst32

These tests depend on SHF_MERGE/SHF_STRINGS support and we have no
effective-target keyword for this.

However, Solaris as supports the ELF section 'e' flag just fine.  The
gcc/configure.ac doesn't detect this because it unconditionally invokes
as with --fatal-warnings, which as doesn't support.

Rather than liberally sprinkling configure.ac with --fatal-warnings as
is done now, this patch just checks for the option once, using the
result everywhere.

Bootstrapped without regressions on i386-pc-solaris2.11,
sparc-sun-solaris2.11 (as and gas), x86_64-pc-linux-gnu, and
x86_64-apple-darwin21.6.0.  auto-host.h is unchanged everywhere except
Solaris/x86 with as and macOS 12.  On the latter, the section exclude
flag is now detected for the same reason.

2026-01-07  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	* configure.ac (fw_as_opt): Set.
	Replace --fatal-warnings by $fw_as_opt.
	(tls_as_opt): Remove --fatal-warnings.
	(gcc_cv_as_tls): Use $fw_as_opt.
	* configure: Regenerate.

diff --git a/gcc/configure b/gcc/configure
index 40d40cb8daadb006a2c3028d48ff660a7a188156..a014c87f0f8f38e77cbc0371fcaec22a8e374338 100755 (executable)
--- a/gcc/configure
+++ b/gcc/configure
@@ -25470,6 +25470,10 @@ case "$ORIGINAL_AS_FOR_TARGET" in
  ;;
 esac
 
+if $gcc_cv_as --help 2>&1 | grep -- --fatal-warnings > /dev/null; then
+  fw_as_opt=--fatal-warnings
+fi
+
 default_ld=
 # Check whether --enable-ld was given.
 if test "${enable_ld+set}" = set; then :
@@ -27392,7 +27396,7 @@ else
   if test x"$gcc_cv_as" != x; then
     $as_echo '.section foo1,"e"
   .byte 0,0,0,0' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -27479,7 +27483,7 @@ else
   if test x"$gcc_cv_as" != x; then
     $as_echo '.section .foo,"awR",%progbits
 .byte 0' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -27527,7 +27531,7 @@ else
 .byte 0
 .section __patchable_function_entries,"awo",%progbits,.foo
 .byte 0' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -27562,7 +27566,7 @@ else
   gcc_cv_as_shf_merge=no
   if test x"$gcc_cv_as" != x; then
     $as_echo '.section .rodata.str, "aMS", @progbits, 1' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -27590,7 +27594,7 @@ else
   gcc_cv_as_shf_merge_percent=no
   if test x"$gcc_cv_as" != x; then
     $as_echo '.section .rodata.str, "aMS", %progbits, 1' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -27625,7 +27629,7 @@ else
   gcc_cv_as_comdat_group=no
   if test x"$gcc_cv_as" != x; then
     $as_echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -27656,7 +27660,7 @@ else
   gcc_cv_as_comdat_group_percent=no
   if test x"$gcc_cv_as" != x; then
     $as_echo '.section .text,"axG",%progbits,.foo,comdat' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -27891,7 +27895,6 @@ foo:    .long   25
        ldah    $2,foo($29)                     !tprelhi
        lda     $3,foo($2)                      !tprello
        lda     $4,foo($29)                     !tprel'
-       tls_as_opt=--fatal-warnings
        ;;
   arc*-*-*)
     conftest_s='
@@ -27904,7 +27907,6 @@ x:      .long   25
         .text
        move.d x:IE,$r10
        nop'
-       tls_as_opt=--fatal-warnings
        ;;
   frv*-*-*)
     conftest_s='
@@ -27938,7 +27940,6 @@ foo:    .long   25
        mfctl %cr27,%t1
        addil LR%foo-$tls_leoff$,%t1
        ldo RR%foo-$tls_leoff$(%r1),%t2'
-       tls_as_opt=--fatal-warnings
        ;;
   arm*-*-*)
     conftest_s='
@@ -27971,7 +27972,6 @@ $as_echo "#define TLS_SECTION_ASM_FLAG 't'" >>confdefs.h
       conftest_s='
        .section ".tdata","awT",@progbits'
       tls_section_flag=T
-      tls_as_opt="--fatal-warnings"
     fi
     case "$target" in
       i[34567]86-*-*)
@@ -28028,7 +28028,6 @@ foo:    data8   25
        addl    r20 = @tprel(foo#), gp
        adds    r22 = @tprel(foo#), r13
        movl    r24 = @tprel(foo#)'
-       tls_as_opt=--fatal-warnings
        ;;
   loongarch*-*-*)
     conftest_s='
@@ -28039,7 +28038,6 @@ x:      .word 2
        bl __tls_get_addr'
        tls_first_major=0
        tls_first_minor=0
-       tls_as_opt='--fatal-warnings'
        ;;
   microblaze*-*-*)
     conftest_s='
@@ -28049,7 +28047,6 @@ x:
        .text
        addik r5,r20,x@TLSGD
        addik r5,r20,x@TLSLDM'
-       tls_as_opt='--fatal-warnings'
        ;;
   mips*-*-*)
     conftest_s='
@@ -28064,7 +28061,7 @@ x:
        lw $4, %gottprel(x)($28)
        lui $4, %tprel_hi(x)
        addiu $4, $4, %tprel_lo(x)'
-       tls_as_opt='-32 --fatal-warnings'
+       tls_as_opt='-32'
        ;;
   m68k-*-*)
     conftest_s='
@@ -28078,7 +28075,6 @@ foo:
        move.l x@TLSLDO(%a5),%a0
        move.l x@TLSIE(%a5),%a0
        move.l x@TLSLE(%a5),%a0'
-       tls_as_opt='--fatal-warnings'
        ;;
   aarch64*-*-*)
     conftest_s='
@@ -28089,7 +28085,6 @@ foo:    .long   25
        add   x0, x0, #:tlsgd_lo12:x
         bl    __tls_get_addr
        nop'
-       tls_as_opt='--fatal-warnings'
        ;;
   or1k*-*-*)
     conftest_s='
@@ -28099,7 +28094,6 @@ foo:    .long   25
        l.movhi r3, tpoffha(foo)
        l.add   r3, r3, r10
        l.lwz   r4, tpofflo(foo)(r3)'
-    tls_as_opt=--fatal-warnings
     ;;
   powerpc-ibm-aix*)
     conftest_s='
@@ -28147,7 +28141,7 @@ x3:     .space 8
        add 9,9,3
        bl .__tls_get_addr
        nop'
-       tls_as_opt="-a64 --fatal-warnings"
+       tls_as_opt="-a64"
        ;;
   powerpc*-*-*)
     conftest_s='
@@ -28171,7 +28165,7 @@ x3:     .space 4
        addi 9,2,x1@tprel
        addis 9,2,x2@tprel@ha
        addi 9,9,x2@tprel@l'
-       tls_as_opt="-a32 --fatal-warnings"
+       tls_as_opt="-a32"
        ;;
   riscv*-*-*)
     conftest_s='
@@ -28180,7 +28174,6 @@ x:      .word 2
        .text
        la.tls.gd a0,x
         call __tls_get_addr'
-       tls_as_opt='--fatal-warnings'
        ;;
   s390-*-*)
     conftest_s='
@@ -28197,7 +28190,7 @@ foo:    .long   25
        l       %r1,0(%r1):tls_load:foo
        bas     %r14,0(%r1,%r13):tls_gdcall:foo
        bas     %r14,0(%r1,%r13):tls_ldcall:foo'
-       tls_as_opt="-m31 --fatal-warnings"
+       tls_as_opt="-m31"
        ;;
   s390x-*-*)
     conftest_s='
@@ -28213,7 +28206,7 @@ foo:    .long   25
        larl    %r1,foo@INDNTPOFF
        brasl   %r14,__tls_get_offset@PLT:tls_gdcall:foo
        brasl   %r14,__tls_get_offset@PLT:tls_ldcall:foo'
-       tls_as_opt="-m64 -Aesame --fatal-warnings"
+       tls_as_opt="-m64 -Aesame"
        ;;
   sh-*-* | sh[123456789lbe]*-*-*)
     conftest_s='
@@ -28225,7 +28218,6 @@ foo:    .long   25
        .long   foo@DTPOFF
        .long   foo@GOTTPOFF
        .long   foo@TPOFF'
-       tls_as_opt=--fatal-warnings
        ;;
   sparc*-*-*)
     case "$target" in
@@ -28242,7 +28234,7 @@ foo:    .long   25
     else
       conftest_s='
        .section ".tdata","awT",@progbits'
-       tls_as_opt="-32 --fatal-warnings"
+       tls_as_opt="-32"
     fi
     conftest_s="$conftest_s
 foo:   .long   25
@@ -28292,7 +28284,7 @@ else
   gcc_cv_as_tls=no
   if test x"$gcc_cv_as" != x; then
     $as_echo "$conftest_s" > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $tls_as_opt -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $tls_as_opt $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -29569,7 +29561,7 @@ else
   gcc_cv_as_section_has_align=no
   if test x"$gcc_cv_as" != x; then
     $as_echo '.section lto_test,"dr0"' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -30679,7 +30671,7 @@ else
   gcc_cv_as_powerpc_entry_markers=no
   if test x"$gcc_cv_as" != x; then
     $as_echo ' .reloc .,R_PPC64_ENTRY; nop' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -a64 --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -a64 $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -30711,7 +30703,7 @@ else
   gcc_cv_as_powerpc_pltseq_markers=no
   if test x"$gcc_cv_as" != x; then
     $as_echo ' .reloc .,R_PPC_PLTSEQ; nop' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -a32 --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -a32 $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -30996,7 +30988,7 @@ else
   gcc_cv_as_micromips_support=no
   if test x"$gcc_cv_as" != x; then
     $as_echo '.set micromips' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -31625,7 +31617,7 @@ else
        nop
        .endr
        beq $a0,$a1,a' > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags --fatal-warnings -o conftest.o conftest.s >&5'
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $fw_as_opt -o conftest.o conftest.s >&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?

diff --git a/gcc/configure.ac b/gcc/configure.ac
index 85272df5a246916a1ad43de4fd18007d71a9bc07..22c2fad56a108d67fcf6f5e6334112218c439d1e 100644 (file)
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -2730,6 +2730,10 @@ case "$ORIGINAL_AS_FOR_TARGET" in
   *) AC_CONFIG_FILES(as:exec-tool.in, [chmod +x as]) ;;
 esac 
 
+if $gcc_cv_as --help 2>&1 | grep -- --fatal-warnings > /dev/null; then
+  fw_as_opt=--fatal-warnings
+fi
+
 default_ld=
 AC_ARG_ENABLE(ld,
 [[  --enable-ld[=ARG]       build ld [ARG={default,yes,no}]]],
@@ -3621,7 +3625,7 @@ fi
 # Test if the assembler supports the section flag 'e' or #exclude for
 # specifying an excluded section.
 gcc_GAS_CHECK_FEATURE([section exclude flag], gcc_cv_as_section_exclude_e,
- [--fatal-warnings],
+ [$fw_as_opt],
  [.section foo1,"e"
   .byte 0,0,0,0])
 if test $gcc_cv_as_section_exclude_e = no; then
@@ -3657,7 +3661,7 @@ case "${target}" in
     ;;
   *)
     gcc_GAS_CHECK_FEATURE([section 'R' flag], gcc_cv_as_shf_gnu_retain,
-      [--fatal-warnings],
+      [$fw_as_opt],
       [.section .foo,"awR",%progbits
 .byte 0])
     ;;
@@ -3677,7 +3681,7 @@ case "${target}" in
     ;;
   *)
     gcc_GAS_CHECK_FEATURE([section 'o' flag], gcc_cv_as_section_link_order,
-      [--fatal-warnings],
+      [$fw_as_opt],
       [.section .foo,"a"
 .byte 0
 .section __patchable_function_entries,"awo",%progbits,.foo
@@ -3689,12 +3693,12 @@ AC_DEFINE_UNQUOTED(HAVE_GAS_SECTION_LINK_ORDER,
   [Define 0/1 if your assembler supports 'o' flag in .section directive.])
 
 gcc_GAS_CHECK_FEATURE(section merging support, gcc_cv_as_shf_merge,
- [--fatal-warnings],
+ [$fw_as_opt],
  [.section .rodata.str, "aMS", @progbits, 1])
 if test $gcc_cv_as_shf_merge = no; then
   gcc_GAS_CHECK_FEATURE(section merging support (%progbits),
     gcc_cv_as_shf_merge_percent,
-    [--fatal-warnings],
+    [$fw_as_opt],
     [.section .rodata.str, "aMS", %progbits, 1])
 fi
 AC_DEFINE_UNQUOTED(HAVE_GAS_SHF_MERGE,
@@ -3704,7 +3708,7 @@ AC_DEFINE_UNQUOTED(HAVE_GAS_SHF_MERGE,
 
 gcc_GAS_CHECK_FEATURE([COMDAT group support (GNU as)],
  gcc_cv_as_comdat_group,
- [--fatal-warnings],
+ [$fw_as_opt],
  [.section .text,"axG",@progbits,.foo,comdat])
 if test $gcc_cv_as_comdat_group = yes; then
   gcc_cv_as_comdat_group_percent=no
@@ -3712,7 +3716,7 @@ if test $gcc_cv_as_comdat_group = yes; then
 else
  gcc_GAS_CHECK_FEATURE([COMDAT group support (GNU as, %type)],
    gcc_cv_as_comdat_group_percent,
-   [--fatal-warnings],
+   [$fw_as_opt],
    [.section .text,"axG",%progbits,.foo,comdat])
  if test $gcc_cv_as_comdat_group_percent = yes; then
    gcc_cv_as_comdat_group_group=no
@@ -3852,7 +3856,6 @@ foo:      .long   25
        ldah    $2,foo($29)                     !tprelhi
        lda     $3,foo($2)                      !tprello
        lda     $4,foo($29)                     !tprel'
-       tls_as_opt=--fatal-warnings
        ;;
   arc*-*-*)
     conftest_s='
@@ -3865,7 +3868,6 @@ x:      .long   25
         .text
        move.d x:IE,$r10
        nop'
-       tls_as_opt=--fatal-warnings
        ;;
   frv*-*-*)
     conftest_s='
@@ -3899,7 +3901,6 @@ foo:      .long   25
        mfctl %cr27,%t1                 
        addil LR%foo-$tls_leoff$,%t1
        ldo RR%foo-$tls_leoff$(%r1),%t2'
-       tls_as_opt=--fatal-warnings
        ;;
   arm*-*-*)
     conftest_s='
@@ -3933,7 +3934,6 @@ changequote(,)dnl
       conftest_s='
        .section ".tdata","awT",@progbits'
       tls_section_flag=T
-      tls_as_opt="--fatal-warnings"
     fi
     case "$target" in
       i[34567]86-*-*)
@@ -3990,7 +3990,6 @@ foo:      data8   25
        addl    r20 = @tprel(foo#), gp
        adds    r22 = @tprel(foo#), r13
        movl    r24 = @tprel(foo#)'
-       tls_as_opt=--fatal-warnings
        ;;
   loongarch*-*-*)
     conftest_s='
@@ -4001,7 +4000,6 @@ x:        .word 2
        bl __tls_get_addr'
        tls_first_major=0
        tls_first_minor=0
-       tls_as_opt='--fatal-warnings'
        ;;
   microblaze*-*-*)
     conftest_s='
@@ -4011,7 +4009,6 @@ x:
        .text
        addik r5,r20,x@TLSGD
        addik r5,r20,x@TLSLDM'
-       tls_as_opt='--fatal-warnings'
        ;;
   mips*-*-*)
     conftest_s='
@@ -4026,7 +4023,7 @@ x:
        lw $4, %gottprel(x)($28)
        lui $4, %tprel_hi(x)
        addiu $4, $4, %tprel_lo(x)'
-       tls_as_opt='-32 --fatal-warnings'
+       tls_as_opt='-32'
        ;;
   m68k-*-*)
     conftest_s='
@@ -4040,7 +4037,6 @@ foo:
        move.l x@TLSLDO(%a5),%a0
        move.l x@TLSIE(%a5),%a0
        move.l x@TLSLE(%a5),%a0'
-       tls_as_opt='--fatal-warnings'
        ;;
   aarch64*-*-*)
     conftest_s='
@@ -4051,7 +4047,6 @@ foo:      .long   25
        add   x0, x0, #:tlsgd_lo12:x
         bl    __tls_get_addr
        nop'
-       tls_as_opt='--fatal-warnings'
        ;;
   or1k*-*-*)
     conftest_s='
@@ -4061,7 +4056,6 @@ foo:      .long   25
        l.movhi r3, tpoffha(foo)
        l.add   r3, r3, r10
        l.lwz   r4, tpofflo(foo)(r3)'
-    tls_as_opt=--fatal-warnings
     ;;
   powerpc-ibm-aix*)
     conftest_s='
@@ -4109,7 +4103,7 @@ x3:       .space 8
        add 9,9,3
        bl .__tls_get_addr
        nop'
-       tls_as_opt="-a64 --fatal-warnings"
+       tls_as_opt="-a64"
        ;;
   powerpc*-*-*)
     conftest_s='
@@ -4133,7 +4127,7 @@ x3:       .space 4
        addi 9,2,x1@tprel
        addis 9,2,x2@tprel@ha
        addi 9,9,x2@tprel@l'
-       tls_as_opt="-a32 --fatal-warnings"
+       tls_as_opt="-a32"
        ;;
   riscv*-*-*)
     conftest_s='
@@ -4142,7 +4136,6 @@ x:        .word 2
        .text
        la.tls.gd a0,x
         call __tls_get_addr'
-       tls_as_opt='--fatal-warnings'
        ;;
   s390-*-*)
     conftest_s='
@@ -4159,7 +4152,7 @@ foo:      .long   25
        l       %r1,0(%r1):tls_load:foo
        bas     %r14,0(%r1,%r13):tls_gdcall:foo
        bas     %r14,0(%r1,%r13):tls_ldcall:foo'
-       tls_as_opt="-m31 --fatal-warnings"
+       tls_as_opt="-m31"
        ;;
   s390x-*-*)
     conftest_s='
@@ -4175,7 +4168,7 @@ foo:      .long   25
        larl    %r1,foo@INDNTPOFF
        brasl   %r14,__tls_get_offset@PLT:tls_gdcall:foo
        brasl   %r14,__tls_get_offset@PLT:tls_ldcall:foo'
-       tls_as_opt="-m64 -Aesame --fatal-warnings"
+       tls_as_opt="-m64 -Aesame"
        ;;
   sh-*-* | sh[123456789lbe]*-*-*)
     conftest_s='
@@ -4187,7 +4180,6 @@ foo:      .long   25
        .long   foo@DTPOFF
        .long   foo@GOTTPOFF
        .long   foo@TPOFF'
-       tls_as_opt=--fatal-warnings
        ;;
   sparc*-*-*)
     case "$target" in
@@ -4204,7 +4196,7 @@ foo:      .long   25
     else
       conftest_s='
        .section ".tdata","awT",@progbits'
-       tls_as_opt="-32 --fatal-warnings"
+       tls_as_opt="-32"
     fi
     conftest_s="$conftest_s
 foo:   .long   25
@@ -4248,7 +4240,7 @@ elif test -z "$conftest_s"; then
   : # If we don't have a check, assume no support.
 else
   gcc_GAS_CHECK_FEATURE(thread-local storage support, gcc_cv_as_tls,
-  [$tls_as_opt], [$conftest_s],,
+  [$tls_as_opt $fw_as_opt], [$conftest_s],,
   [set_have_as_tls=yes])
 fi
 case $target_os in
@@ -4890,7 +4882,7 @@ foo:      nop
        # but normally only after installation, so we warn but don't fail the
        # configure if LTO is enabled but the assembler does not support it.
        gcc_GAS_CHECK_FEATURE([.section with alignment], gcc_cv_as_section_has_align,
-         -fatal-warnings,[.section lto_test,"dr0"])
+         $fw_as_opt,[.section lto_test,"dr0"])
        if test x$gcc_cv_as_section_has_align != xyes; then
          case ",$enable_languages," in
            *,lto,*)
@@ -5287,13 +5279,13 @@ LCF0:
          [Define if your assembler supports .gnu_attribute.])])
 
     gcc_GAS_CHECK_FEATURE([prologue entry point marker support],
-      gcc_cv_as_powerpc_entry_markers,-a64 --fatal-warnings,
+      gcc_cv_as_powerpc_entry_markers,-a64 $fw_as_opt,
       [ .reloc .,R_PPC64_ENTRY; nop],,
       [AC_DEFINE(HAVE_AS_ENTRY_MARKERS, 1,
          [Define if your assembler supports the R_PPC64_ENTRY relocation.])])
 
     gcc_GAS_CHECK_FEATURE([plt sequence marker support],
-      gcc_cv_as_powerpc_pltseq_markers,-a32 --fatal-warnings,
+      gcc_cv_as_powerpc_pltseq_markers,-a32 $fw_as_opt,
       [ .reloc .,R_PPC_PLTSEQ; nop],,
       [AC_DEFINE(HAVE_AS_PLTSEQ, 1,
          [Define if your assembler supports R_PPC*_PLTSEQ relocations.])])
@@ -5369,7 +5361,7 @@ LCF0:
     fi
 
     gcc_GAS_CHECK_FEATURE([.micromips support],
-      gcc_cv_as_micromips_support,[--fatal-warnings],
+      gcc_cv_as_micromips_support,[$fw_as_opt],
       [.set micromips],,
       [AC_DEFINE(HAVE_GAS_MICROMIPS, 1,
           [Define if your assembler supports the .set micromips directive])])
@@ -5570,7 +5562,7 @@ x:
                [Define if your assembler supports -mrelax option.])])
     gcc_GAS_CHECK_FEATURE([conditional branch relaxation support],
       gcc_cv_as_loongarch_cond_branch_relax,
-      [--fatal-warnings],
+      [$fw_as_opt],
       [a:
        .rept 32769
        nop