[patch] --enable-dynamic-string default for mingw-w64

[Kai Tietz]

2011/9/20 JonY <jon_y@users.sourceforge.net>:
> Hi,
>
> Its been used in the automated toolchain builds for sometime, seems like
> a good idea to enable it by default. It can be easily changed to match
> for all mingw as well if needed.
>
> OK for trunk?
>
> Index: libstdc++-v3/configure.ac
> ===================================================================
> --- libstdc++-v3/configure.ac   (revision 178946)
> +++ libstdc++-v3/configure.ac   (working copy)
> @@ -132,7 +132,15 @@
>  GLIBCXX_ENABLE_DEBUG([no])
>  GLIBCXX_ENABLE_PARALLEL([yes])
>  GLIBCXX_ENABLE_CXX_FLAGS
> -GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])
> +case "$host" in
> +  # Enable fully ynamic strings on mingw-w64 by default
> +  i?86-w64-mingw* | x86_64-w64-mingw*)
> +    GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([yes])
> +    ;;
> +  *)
> +    GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])
> +    ;;
> +esac
>  GLIBCXX_ENABLE_EXTERN_TEMPLATE([yes])
>
>  # Checks for operating systems support that doesn't require linking.

This patch looks reasonable to me. Note that this is no approval for
it, as I'm not a libstdc++ maintainer.  But I can confirm that patch
is ok from perspective of windows-target maintainer.
Just one question I have here.  Why do we enable this option only for
w64 flavor?  AFAIK is mingw.org also building their libstdc++ with
enabling this configure-option

Kai