Re: [PATCH 1/3] configure: Allow LD to be a linker other than GNU ld and gold

["H.J. Lu" <hjl.tools@gmail.com>]

On Mon, Dec 28, 2020 at 11:49 AM Fangrui Song via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> When using lld as the linker, configure prints a confusing message.
>
> *** These critical programs are missing or too old: GNU ld
>
> lld>=8 can build glibc with very few patches. lld may be built with a
> custom version information (e.g. git commit ID), so a version check is not
> useful at all.

But not all versions of lld can be used to build glibc.  Please find a way
to check the working lld version.

> ---
>  configure    | 13 ++++++++-----
>  configure.ac | 13 ++++++++-----
>  2 files changed, 16 insertions(+), 10 deletions(-)
>
> diff --git a/configure b/configure
> index 6a35553805..6dcd2270f8 100755
> --- a/configure
> +++ b/configure
> @@ -4601,9 +4601,10 @@ if test $ac_verc_fail = yes; then
>  fi
>
>
> -if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
> +case $($LD --version) in
> +  "GNU gold"*)
>    # Accept gold 1.14 or higher
> -  for ac_prog in $LD
> +    for ac_prog in $LD
>  do
>    # Extract the first word of "$ac_prog", so it can be a program name with args.
>  set dummy $ac_prog; ac_word=$2
> @@ -4666,8 +4667,9 @@ if test $ac_verc_fail = yes; then
>    LD=: critic_missing="$critic_missing GNU gold"
>  fi
>
> -else
> -  for ac_prog in $LD
> +    ;;
> +  "GNU ld"*)
> +    for ac_prog in $LD
>  do
>    # Extract the first word of "$ac_prog", so it can be a program name with args.
>  set dummy $ac_prog; ac_word=$2
> @@ -4730,7 +4732,8 @@ if test $ac_verc_fail = yes; then
>    LD=: critic_missing="$critic_missing GNU ld"
>  fi
>
> -fi
> +    ;;
> +esac
>
>  # These programs are version sensitive.
>
> diff --git a/configure.ac b/configure.ac
> index 43cfac9d48..1a2054cd1a 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -979,18 +979,21 @@ AC_CHECK_PROG_VER(AS, $AS, --version,
>                   [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
>                   AS=: critic_missing="$critic_missing as")
>
> -if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
> +case $($LD --version) in
> +  "GNU gold"*)
>    # Accept gold 1.14 or higher
> -  AC_CHECK_PROG_VER(LD, $LD, --version,
> +    AC_CHECK_PROG_VER(LD, $LD, --version,
>                     [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
>                     [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
>                     LD=: critic_missing="$critic_missing GNU gold")
> -else
> -  AC_CHECK_PROG_VER(LD, $LD, --version,
> +    ;;
> +  "GNU ld"*)
> +    AC_CHECK_PROG_VER(LD, $LD, --version,
>                     [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
>                     [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
>                     LD=: critic_missing="$critic_missing GNU ld")
> -fi
> +    ;;
> +esac
>
>  # These programs are version sensitive.
>  AC_CHECK_TOOL_PREFIX
> --
> 2.29.2.729.g45daf8777d-goog
>


-- 
H.J.