[v3] Modify gas uleb128 support test

  Some assemblers (GNU as for LoongArch) generates relocations for leb128
symbol arithmetic for relaxation, we need to disable relaxation probing
leb128 support then.

gcc/ChangeLog:

    * configure: Regenerate.
    * configure.ac: Checking assembler for -mno-relax support.
    Disable relaxation when probing leb128 support.

co-authored-by: Xi Ruoyao <xry111@xry111.site>
---
 gcc/configure    | 42 +++++++++++++++++++++++++++++++++++++++++-
 gcc/configure.ac | 17 ++++++++++++++++-
 2 files changed, 57 insertions(+), 2 deletions(-)
  

Pushed to r14-4161.

在 2023/9/19 下午3:01, mengqinggang 写道:
> Some assemblers (GNU as for LoongArch) generates relocations for leb128
> symbol arithmetic for relaxation, we need to disable relaxation probing
> leb128 support then.
>
> gcc/ChangeLog:
>
>      * configure: Regenerate.
>      * configure.ac: Checking assembler for -mno-relax support.
>      Disable relaxation when probing leb128 support.
>
> co-authored-by: Xi Ruoyao <xry111@xry111.site>
> ---
>   gcc/configure    | 42 +++++++++++++++++++++++++++++++++++++++++-
>   gcc/configure.ac | 17 ++++++++++++++++-
>   2 files changed, 57 insertions(+), 2 deletions(-)
>
> diff --git a/gcc/configure b/gcc/configure
> index d5e218e9a16..2ceab4e3b9c 100755
> --- a/gcc/configure
> +++ b/gcc/configure
> @@ -24676,6 +24676,46 @@ _ACEOF
>   
>   
>   
> +# Some assemblers (GNU as for LoongArch) generates relocations for
> +# leb128 symbol arithmetic for relaxation, we need to disable relaxation
> +# probing leb128 support then.
> +case $target in
> +  loongarch*-*-*)
> +    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -mno-relax support" >&5
> +$as_echo_n "checking assembler for -mno-relax support... " >&6; }
> +if ${gcc_cv_as_mno_relax+:} false; then :
> +  $as_echo_n "(cached) " >&6
> +else
> +  gcc_cv_as_mno_relax=no
> +  if test x$gcc_cv_as != x; then
> +    $as_echo '.text' > conftest.s
> +    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -mno-relax -o conftest.o conftest.s >&5'
> +  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
> +  (eval $ac_try) 2>&5
> +  ac_status=$?
> +  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
> +  test $ac_status = 0; }; }
> +    then
> +	gcc_cv_as_mno_relax=yes
> +    else
> +      echo "configure: failed program was" >&5
> +      cat conftest.s >&5
> +    fi
> +    rm -f conftest.o conftest.s
> +  fi
> +fi
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_mno_relax" >&5
> +$as_echo "$gcc_cv_as_mno_relax" >&6; }
> +if test $gcc_cv_as_mno_relax = yes; then
> +  check_leb128_asflags=-mno-relax
> +fi
> +
> +    ;;
> +  *)
> +    check_leb128_asflags=
> +    ;;
> +esac
> +
>   # Check if we have .[us]leb128, and support symbol arithmetic with it.
>   # Older versions of GAS and some non-GNU assemblers, have a bugs handling
>   # these directives, even when they appear to accept them.
> @@ -24694,7 +24734,7 @@ L1:
>   L2:
>   	.uleb128 0x8000000000000000
>   ' > conftest.s
> -    if { ac_try='$gcc_cv_as $gcc_cv_as_flags  -o conftest.o conftest.s >&5'
> +    if { ac_try='$gcc_cv_as $gcc_cv_as_flags $check_leb128_asflags -o conftest.o conftest.s >&5'
>     { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
>     (eval $ac_try) 2>&5
>     ac_status=$?
> diff --git a/gcc/configure.ac b/gcc/configure.ac
> index 019d0375a2f..d780ea25386 100644
> --- a/gcc/configure.ac
> +++ b/gcc/configure.ac
> @@ -3229,10 +3229,25 @@ AC_MSG_RESULT($gcc_cv_ld_ro_rw_mix)
>   
>   gcc_AC_INITFINI_ARRAY
>   
> +# Some assemblers (GNU as for LoongArch) generates relocations for
> +# leb128 symbol arithmetic for relaxation, we need to disable relaxation
> +# probing leb128 support then.
> +case $target in
> +  loongarch*-*-*)
> +    gcc_GAS_CHECK_FEATURE([-mno-relax support],
> +      gcc_cv_as_mno_relax,[-mno-relax],[.text],,
> +      [check_leb128_asflags=-mno-relax])
> +    ;;
> +  *)
> +    check_leb128_asflags=
> +    ;;
> +esac
> +
>   # Check if we have .[us]leb128, and support symbol arithmetic with it.
>   # Older versions of GAS and some non-GNU assemblers, have a bugs handling
>   # these directives, even when they appear to accept them.
> -gcc_GAS_CHECK_FEATURE([.sleb128 and .uleb128], gcc_cv_as_leb128,,
> +gcc_GAS_CHECK_FEATURE([.sleb128 and .uleb128], gcc_cv_as_leb128,
> +[$check_leb128_asflags],
>   [	.data
>   	.uleb128 L2 - L1
>   L1: