Re: [PATCH] configure: Escape non-numbers in version_ge()

[Alex Bennée]

Philippe Mathieu-Daudé <philmd@redhat.com> writes:

> On Red Hat based distributions, the configure script emits various
> warnings:
>
>   # ./configure
>   Using './build' as the directory for build output
>   ./configure: line 212: test: 2-15: integer expression expected
>   ./configure: line 213: test: 2-15: integer expression expected
>   ./configure: line 212: test: el8: integer expression expected
>   ./configure: line 213: test: el8: integer expression expected
>
> This is produced by the gdb version check introduced in commit
> b1863ccc957 ("configure: gate our use of GDB to 8.3.1 or above"):
>
>     gdb_version=$($gdb_bin --version | head -n 1)
>     if version_ge ${gdb_version##* } 8.3.1; then
>         echo "HAVE_GDB_BIN=$gdb_bin" >> $config_host_mak
>     fi
>
> Because on RHEL/Fedora the minor version is not a plain number:
>
>   $ gdb --version | head -n 1
>   GNU gdb (GDB) Fedora 9.1-7.fc32
>
>   $ gdb --version | head -n 1
>   GNU gdb (GDB) Red Hat Enterprise Linux 8.2-15.el8
>
> Fix by only using the leading numbers, stripping the rest.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  configure | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/configure b/configure
> index e85d6baf8f8..21f6530a812 100755
> --- a/configure
> +++ b/configure
> @@ -205,7 +205,7 @@ version_ge () {
>          local_first=${2-0}
>          # 'shift 2' if $2 is set, or 'shift' if $2 is not set
>          shift ${2:+2}
> -        local_ver1=$*
> +        local_ver1=$(echo $* | sed -E 's/(^[0-9]+).*/\1/')
>          set x $local_ver2
>          # the second argument finished, the first must be greater or equal
>          test $# = 1 && return 0

I already have a fix that was posted in:

  Subject: [PATCH  v2 7/8] configure: make version_ge more tolerant of shady 
version input
  Date: Fri, 22 Jan 2021 18:18:53 +0000
  Message-Id: <20210122181854.23105-8-alex.bennee@linaro.org>

About to feature in the pre-PR series I'm about to post.

-- 
Alex Bennée