Re: [Help-glpk] [Fwd: Build glpk as a shared library on Cygwin, MinGW and similar systems]

[marco atzeri]

On 12/10/2012 8:20 PM, Andrew Makhorin wrote:
> -------- Forwarded Message --------
> From: Jean-Pierre Flori <address@hidden>
> To: address@hidden
> Subject: Build glpk as a shared library on Cygwin, MinGW and similar
> systems
> Date: Mon, 10 Dec 2012 19:20:19 +0100
>
> Dear all,
>
> First thanks for this great library.
>
> I'd like to be able to build glpk as a shared library on Cygwin and MinGW.
> But on such system (and surely others), libtool will refuse without some help.
>
> Would you consider adding the "-no-undefined" flag to
> "libglpk_la_LDFLAGS" in src/Makefile.am?
> This flag is needed under such systems to
> promise libtool that the linker won't encounter undefined symbols at
> link time.
> Without it, recent (since some years) versions of libtool just don't
> even try linking and fall back to only making static libraries.
> (See http://www.sourceware.org/autobook/autobook/autobook_88.html for some doc.)
>
> This flag should be harmless on other systems, but you could also only
> add it conditionally on the fact the build is performed on Cygwin or others
> (e.g. check __CYGWIN__, surely some autotools magic does it as well,
> using some case $host in .... *-cygwin or something like that)
> and/or that a shared version is being built.
>
> The corresponding piece of code in MPIR is here:
> https://github.com/wbhart/mpir/blob/master/configure.in#L1844
>
> For MPFR, you can have a look here:
> https://gforge.inria.fr/scm/viewvc.php/trunk/configure.ac?view=markup&revision=8432&root=mpfr
> The solution is similar.
>
> Best,

Jean-Pierre

glpk is already available as shared library on cygwin

$ cygcheck -c -d |grep glpk
glpk                                     4.47-1
libglpk-devel                            4.47-1
libglpk0                                 4.47-1

and of course is configured with "LDFLAGS=-no-undefined"

Why do you need to build it again ?
Something missing on my build ?


Regards
Marco