Re: How can I keep -lstdc++ out of $postdeps?

Mike Frysinger <[email protected]> Thu, 23 Feb 2017 14:33:06 -0500

Newsgroups	gmane.comp.gnu.libtool.general
Message-ID	<20170223193306.GW28432@vapier>

On 23 Feb 2017 12:22, Jack Bates wrote:
> On 23/02/17 12:04 PM, Mike Frysinger wrote:
> > On 23 Feb 2017 09:01, Jack Bates wrote:
> >> On 22/02/17 12:16 PM, Mike Frysinger wrote:
> >>> On 22 Feb 2017 10:32, Jack Bates wrote:
> >>>> How can I avoid dynamically linking with libstdc++?
> >>>> or, how can I keep -lstdc++ out of $postdeps?
> >>>
> >>> let's back up.  what is it you're actually trying to do ?
> >>> you want to create a statically linked C++ program ?
> >>> you want to link a C program ?
> >>> something else ?
> >>
> >> Well, I'm asking for a friend [1]. It sounds like he's got one version
> >> of libstdc++ in his build infrastructure and another (older) version on
> >> his production machines. He wants to avoid using the older version (I
> >> think because of an issue with the STL) which is why he's trying to keep
> >> -lstdc++ out of the linker arguments.
> >
> > unfortunately, trying to hack the link lines won't help with this.  the
> > headers and libraries are kept in sync.  you can't use newer headers and
> > try to run against older libraries.
> >
> > your best bet is probably to just get an older toolchain and use that to
> > compile.  or get a copy of the distro that's used in production and use
> > that to compile the code you care about.  distros often can be used in
> > chroots so it's not like you need to reinstall the entire system.
> 
> As far as I know, the headers and libraries in the build infrastructure 
> are in sync with each other. -static-libstdc++ should use that version, 
> no? Whereas -lstdc++ runs the risk of dynamically linking with the older 
> version on the production machines -- which is what he wants to avoid. 
> Or do I misunderstand? Thanks for your help!

correct, if you use -static-libstdc++, then you should get a C++ prog
that should run fine on older distros even if they have older libstdc++
runtimes.
-mike

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