Re: version string comparison

[Nick Bowler]

On 2021-01-30, Thien-Thi Nguyen <ttn@gnuvola.org> wrote:
> In GNUnet configure.ac, there is the fragment:
>
>  # test for libunistring
>  gl_LIBUNISTRING
>  AS_IF([test "x$gl_libunistring_hexversion" = "x" || test
> "$gl_libunistring_hexversion" -le 2305],
>        [AC_MSG_ERROR([GNUnet requires libunistring >= 0.9.1.1])])
>
> that uses the var ‘gl_libunistring_hexversion’ which is
> undocumented (IIUC).  OTOH, var ‘LIBUNISTRING_VERSION’ is
> indeed documented, and has value something like "0.9.10".
>
> Is there any Autoconf support for comparing these two version
> strings: "0.9.1.1" and "0.9.10"?

I think AS_VERSION_COMPARE[1] should do the trick?

[1] 
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.70/autoconf.html#index-AS_005fVERSION_005fCOMPARE

Cheers,
  Nick