Any chance to integrate the suggested patch into the next release?
We've been using it in Sage for months without any problem on any kind of platform we support.

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

Dear all,

Your autotools configuration files let shared library build on MinGW by passing the -no-undefined flag to libtool with the following piece of code:
MINGW32_HOST = @MINGW32_HOST@
if MINGW32_HOST
libgsl_la_LIBADD += cblas/libgslcblas.la
libgsl_la_LDFLAGS += -no-undefined
endif

The same is done for libgslcblas.

A similar trick is needed on Cygwin (and surely other flavours of MinGW which now exist).

Could you modify the tests so that the flag is passed as well on such platforms?

Best,
JP