[PATCH cygport] autotools.cygclass: correctly detect Autoconf 2.70+

[Jon Turney]

On 11/03/2022 22:40, Adam Dinwoodie wrote:
> The latest version of Autoconf is 2.71, but the version detection
> incorrectly considers 2.70 and higher as being the same as 2.59 and
> lower for the purposes of specifying documentation directories.  Correct
> that, and make the version detection a bit more future-proof by parsing
> out the actual version parts and performing numeric comparison.
> 
> While we're at it, add a bit more commentary explaining the intent of
> the different behaviour over the different Autoconf versions.
> ---
>   cygclass/autotools.cygclass | 34 +++++++++++++++++++++++-----------
>   1 file changed, 23 insertions(+), 11 deletions(-)
> 
> diff --git a/cygclass/autotools.cygclass b/cygclass/autotools.cygclass
> index cce9be0..2ab5626 100644
> --- a/cygclass/autotools.cygclass
> +++ b/cygclass/autotools.cygclass
> @@ -619,6 +619,8 @@ cygconf() {
>   	local confdir;
>   	local configure;
>   	local confver;
> +	local confver_maj;
> +	local confver_min;
>   	local f;
>   	local foo_config;
>   	local prefix;
> @@ -651,6 +653,8 @@ cygconf() {
>   
>   	configure="${confdir}/configure"
>   	confver=$(grep -m 1 'GNU Autoconf' ${configure} | cut -d ' ' -f 6)
> +	confver_maj=${confver%%.*}
> +	confver_min=${confver##*.}
>   
>   	# AC_CONFIG_FILES should not be dist'ed, but it sometimes happens anyway
>   	eval $(grep -h '^ac_config_files=' ${configure})
> @@ -678,18 +682,26 @@ cygconf() {
>   		confargs+=" --libdir=${prefix}/${MULTILIB_LIBDIR}"
>   	fi
>   
> -	case "x${confver}" in
> -		x2.6[0-9]*)
> -			confargs+=" --docdir=/usr/share/doc/${PN} --htmldir=/usr/share/doc/${PN}/html"
> -			;;
> -		*)
> -			confargs+=" --infodir=${prefix}/share/info --mandir=${prefix}/share/man"
> -			;;
> -	esac
> +	if [ $confver_maj -ge 2 -a $confver_min -ge 60 ] || [ $confver_maj -ge 3 ]

Great. Thanks.

I think it would be acceptable to error on autoconf >=3.0, rather than 
assuming it's going to be autoconf 2.6+ compatible.