[PATCH] add gcc_assert

[Andreas Tobler]

Nathan Sidwell wrote:

> This patch implements gcc_assert & gcc_unreachable along with
> a checking flag --enable-checking=assert.
> 
> --disable-checking will disable asserts, the default is to
> enable them.
> 
> I'm not sure how
>     # Enable some checks by default for development versions of GCC
> gets turned into
>     # By default, disable all checks for release versions of GCC.
> for releases. Can someone clue me in please? I'll set the default
> to enable the assertions on relases too.
> 
> built on i686-pc-linux-gnu with a manual assert in toplev.c.
> 

Well, this patch breaks bootstrap with --disable-cheking.

First occurence is cp/class.c:5023 where we get an unsued var primary.

Other instances follow.

Andreas