[Bug-gsl] [bug #37894] Shared library does not build on Cygwin

[Jean-Pierre Flori]

Follow-up Comment #2, bug #37894 (project gsl):

The way I would do it, inspired by other project, is to modify configure.ac
where MINGW and MINGW32_HOST are defined (from line 150) to something like:
AC_SUBST(GSL_LDFLAGS)
AC_SUBST(GSL_LIBADD)
case "$host_os" in
  *cygwin* | *mingw* )
    if test "$enable_shared" = yes; then
      GSL_LDFLAGS="$GSL_LDFLAGS -no-undefined"
      GSL_LIBADD="cblas/libgslcblas.la"
    fi
    ;;
esac

And in cblas/Makefile.am, replace at the top
libgslcblas_la_LDFLAGS = -version-info $(GSL_LT_CBLAS_VERSION)

MINGW32_HOST = @MINGW32_HOST@
if MINGW32_HOST
libgslcblas_la_LDFLAGS += -no-undefined
endif
by
libgslcblas_la_LDFLAGS = @GSL_LDFLAGS@ -version-info $(GSL_LT_CBLAS_VERSION)

And in Makefile.am, do something similar and get
libgsl_la_LIBADD = @GSL_LIBADD@ $(SUBLIBS)
libgsl_la_LDFLAGS = @GSL_LDFLAGS@ -version-info $(GSL_LT_VERSION)

See https://github.com/wbhart/mpir/blob/master/configure.in#L1840 for how this
is done in MPIR.

And here
https://gforge.inria.fr/scm/viewvc.php/trunk/configure.ac?view=markup&root=mpfr
for MPFR.

Best,
JP

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