Re: [boost] [type_traits] Rewrite and dependency free version

Subject: Re: [boost] [type_traits] Rewrite and dependency free version
From: Dave Gomboc (dave_gomboc_at_[hidden])
Date: 2015-01-22 11:20:55

On 1/15/2015 3:12PM, Edward Diener wrote:
> Trying gcc-3.4.2 it has the same result as gcc-3.4.5 using master and
> Version2 branches.
>
> Trying gcc-3.3.3 it complains:
>
> "cc1plus.exe: error: unrecognized option `-Wextra'"
>
> for every file whether using master or version2.
>
> Whether type_traits should compile with these old gcc-3 versions is up
> to you.

Older versions of gcc (including the unofficial 2.96 versions that are
still being used in 2015, by the way) will accept -W, but not know
about -Wextra (the newer name for -W).  However, do not confuse -W
with -w.

I have actually been able to implement things like integral_constant
directly that compile and work on gcc 2.96.  The main workaround
required is to split up the template specialization into two lines:
create an int const some_name = <some compile-time calculable value>,
then perform the template specialization on a second line of code
using ... ::value = some_name.

So, supporting gcc 3.x should be a breeze. ;-)

Dave