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Re: [RFC] Custom tag interface

From: Scott James Remnant
Subject: Re: [RFC] Custom tag interface
Date: Thu, 18 Mar 2004 04:04:06 +0000

On Thu, 2004-03-18 at 02:55, Bob Friesenhahn wrote:

> On Wed, 17 Mar 2004, Scott James Remnant wrote:
> > This is currently a Request For Comments only, if people like this patch
> > I'll make any necessary changes, write up some documentation for it and
> > mail a proper patch later.
> Will these changes support multiple actual compilers for the same
> language, or only aliases for the same compiler?  For example, a
> Solaris user may use both GCC and Sun's commercial compiler and it
> would be useful to for the installed libtool to support both.
My intent is that in the future, this should certainly be supported;
this patch takes the first step towards doing that.  The next one would
be changing the _LT_LANG_*_CONFIG macros to actually *call* AC_PROG_CXX
and the like, rather than using AC_REQUIRE to ensure that they have been

There could probably be some logic like this:

        m4_if([$1], _LT_LANG_TAG_CXX,

So for the automatic/first "LT_LANG(C++)" invocation it'd act like it
does now, for every subsequent one would do all the tests again.  Then
you could do something like:

        save_CXX=$CXX; CXX="/opt/sfw/bin/gcc"
        LT_LANG(C++, GNUCC)

        save_CXX=$CXX; CXX="/opt/SUNWspro/bin/cc"
        LT_LANG(C++, SUNCC)

> Also, sometimes compilers support major modes.  For example, the same
> compiler front end may support 32-bit and 64-bit compilation.  It is
> possible that the compiler behaves sufficiently differently between
> the two modes that it would be useful for libtool to be able to
> support each as a separate tag.  Is this possible?
Same way:

        save_CFLAGS=$CFLAGS; CFLAGS="-m32 $CFLAGS"
        LT_LANG(C, C64)

        save_CFLAGS=$CFLAGS; CFLAGS="-m64 $CFLAGS"
        LT_LANG(C, C64)

As I said, this isn't directly supported by this patch; but it's
certainly this patch would allow us to do if we chose to go down that

Have you ever, ever felt like this?
Had strange things happen?  Are you going round the twist?

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