top-level configure.ac: factor the libgomp check for posix-like OS

[Thomas Schwinge]

Hi!

On Mon, 17 Aug 2015 06:46:32 -0700, Gary Funck <gary@intrepid.com> wrote:
> I'm working on a patch set for GUPC, and as part of that work,
> I may have a couple changes to trunk that will improve the fit
> with the GUPC changes.  Here's one in configure.ac.
> 
> At the moment, there is a check to see if $enable_libgom
> is not set, followed by a case statement which adds
> libgomp to $noconfigdirs on non POSIX-like OS's.

Hmm...

> We'd like to re-use that logic for libgupc,
> which has a similar requirement and propose this
> re-factoring for trunk.

> --- configure.ac        (revision 226928)
> +++ configure.ac        (working copy)
> @@ -529,9 +529,8 @@ if test x$enable_static_libjava != xyes
>  fi
>  AC_SUBST(EXTRA_CONFIGARGS_LIBJAVA)
>  
> -# Enable libgomp by default on hosted POSIX systems, and a few others.
> -if test x$enable_libgomp = x ; then
> -    case "${target}" in
> +posix_like_os="yes"
> +case "${target}" in
>      *-*-linux* | *-*-gnu* | *-*-k*bsd*-gnu | *-*-kopensolaris*-gnu)
>         ;;
>      *-*-netbsd* | *-*-freebsd* | *-*-openbsd* | *-*-dragonfly*)
> @@ -543,9 +542,14 @@ if test x$enable_libgomp = x ; then
>      nvptx*-*-*)
>         ;;
>      *)
> -       noconfigdirs="$noconfigdirs target-libgomp"
> -       ;;
> -    esac
> +    posix_like_os="no"
> +    ;;
> +esac

Even if applicable regarding the libgomp configuration (because
nvptx-none has its own libgomp "port": libgomp/config/nvptx/), it seems a
bit strange to qualify nvptx-none as a POSIX-like system.

> +
> +# Enable libgomp by default on POSIX hosted systems.
> +if test x$enable_libgomp = x && test $posix_like_os = "no" ; then
> +    # Disable libgomp on non POSIX hosted systems.
> +    noconfigdirs="$noconfigdirs target-libgomp"
>  fi

So, we'll have to see whether that applies to libgupc for nvptx-none,
too.


Grüße,
 Thomas
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