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Date: Fri, 24 Apr 2015 06:16:00 -0000
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: [PATCH 4/4] compile: Add 'set compile-gcc'
In-reply-to: <20150423210916.GA8816@host1.jankratochvil.net>
To: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: gdb-patches@sourceware.org, pmuldoon@redhat.com
Reply-to: Eli Zaretskii <eliz@gnu.org>
Message-id: <83h9s6yrsz.fsf@gnu.org>
References: <20150421213635.14147.15653.stgit@host1.jankratochvil.net> <20150421213657.14147.60506.stgit@host1.jankratochvil.net> <83ioco4oid.fsf@gnu.org> <20150423210916.GA8816@host1.jankratochvil.net>
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> Date: Thu, 23 Apr 2015 23:09:16 +0200
> From: Jan Kratochvil <jan.kratochvil@redhat.com>
> Cc: gdb-patches@sourceware.org, pmuldoon@redhat.com
> 
> > > +Besides the compiler driver @value{GDBN} needs also shared library
> > > +@file{libcc1.so}.  It is searched in default shared library search path
> > > +(overridable with usual environment variable @code{LD_LIBRARY_PATH}),
> > > +unrelated to @code{PATH} or @code{set compile-gcc} settings.
> > 
> > This is Unix logic, btw.  On Windows, libcc1.dll will either be in the
> > same directory where the GCC driver is, or on PATH, or in libexec.  So
> > maybe you should qualify the above by saying this is on Posix hosts;
> > we could then amend it when this is supported on Windows (assuming it
> > isn't for now).
> 
> I do not think it would work on MS-Windows host as gcc/libcc1/ uses:
> 	# If any of these functions are missing, simply don't bother building
> 	# this plugin.
> 	GCC_ENABLE_PLUGINS
> 	AC_CHECK_FUNC(socketpair, , enable_plugin=no)
> 	AC_CHECK_FUNC(select, , enable_plugin=no)
> 	AC_CHECK_FUNC(fork, , enable_plugin=no)
> 	AM_CONDITIONAL(ENABLE_PLUGIN, test $enable_plugin = yes)

You underestimate the hacker power ;-)  Trust me, soon enough this
will work on Windows, and these conditions will then change.  So I
still think we should qualify the above logic by saying that it is
specific to Posix systems.

Thanks.