Re: How do I run "make check" in gcc with libstdc++-v3?

["H . J . Lu" <hjl at lucon dot org>]

On Tue, May 16, 2000 at 01:27:19AM -0500, Loren James Rittle wrote:
> In article <20000515222748.L6082@wolery.cumb.org>, 
> Zack Weinberg <zack@wolery.cumb.org> writes:
> 
> >> [...]  The only ways I see to get rid of those
> >> failures is (1) to find libstdc++-v3 headers with -isystem instead of
> >> -I while testing [good luck finding the right order for -isystem
> >> arguments given the current interactions with -B]
> 
> > I just had an idea.  System-header-ness can be forced on with #line,
> > sort of - you'd write
> 
> > #line 2 "header.h" 3
> 
> > at the very top of the file, and that *should* suppress -pedantic
> > warnings in the rest of the file.
> 
> Sorry, but unless I did something else dumb, when in ``-ansi
> -pedantic-errors'' mode, this error results:
> 
> .../libstdc++-v3/bits/std_exception.h:33:33: garbage at end of `#line' command
> 
> when this line is seen:
> 
> #line 37 "bits/std_typeinfo.h" 3
> 
> However, it does remove the ISO C violation errors later when
> #include_next is processed. ;-)
> 
> > This is not suitable for general
> > use because (a) it's an obscure extension, and (b) it means errors in
> > the rest of the file will not carry information about the path to the
> > file (so e.g. emacs compilation-mode won't be able to find it).  But
> > we could have a thingy that just forced system-header-ness on and
> > didn't do anything else: something like #pragma system_header is
> > probably the appropriate interface.
> 
> > What do people think of this idea?  It is absolutely trivial to
> > implement if we like it.  It can be rejected in the primary source
> > file, which would prevent most of the abuses I can think of right now.
> 
> Although I think we are just kludging something to circumvent other
> issues, #pragma system_header would solve the final issue at hand in
> conjunction with HJ's patch to allow `make check-g++' against
> libstdc++-v3 in place before final installation or any
> pre-install-of-headers step.

#pragma system_header sounds like a good idea. But there are many
test cases with

#include <iostream.h>

It won't work too well with libstdc++-v3. Since <iostream> is supported
by libstdc++, I believe we should convert all the C++ test cases with
the old style header files with the new ones.


H.J.