[Olena-patches] oln-0.10 10.237: Compute LDFLAGS required to create shared libraries

I'll try to use Libtool in Olena 0.10a (soon) to replace this hack. 2006-07-07 Roland Levillain <roland(a)lrde.epita.fr> Add an Autoconf macro to figure out what are the linker flags for creating a shared library. This is actually a hack, hopefully replaced by Libtool in a future update. * config/oln.m4 (AC_SHARED_LDFLAGS): New macro. * configure.ac: Use it. Save CPPFLAGS before altering them. Index: 10.236/configure.ac --- 10.236/configure.ac Thu, 24 Jun 2004 18:10:23 +0200 odou_s (oln/3_configure. 1.47.1.1.1.1.1.4.1.15.1.16.1.7 600) +++ 10.237/configure.ac Fri, 07 Jul 2006 18:18:48 +0200 levill_r (oln/3_configure. 1.47.1.1.1.1.1.4.1.15.1.16.1.8 600) @@ -388,6 +388,8 @@ AC_CHECK_SWIG_FLAGS + AC_SHARED_LDFLAGS + AC_ARG_VAR([DVIPS], [program to make Postscript from TeX DVI files]) AC_CHECK_PROGS([DVIPS], [dvips], [$am_aux_dir/missing dvips]) AC_ARG_VAR([TEXI2DVI], [program to create DVI from Texinfo files]) @@ -438,6 +440,7 @@ echo $line fi done`"]) + save_CPPFLAGS=$CPPFLAGS CPPFLAGS="$CPPFLAGS $RUBY_CPPFLAGS" AC_CHECK_HEADERS([ruby.h],, AC_MSG_ERROR( Index: 10.236/config/oln.m4 --- 10.236/config/oln.m4 Tue, 04 Jul 2006 13:33:04 +0200 levill_r (oln/j/15_oln.m4 1.38.1.13 600) +++ 10.237/config/oln.m4 Fri, 07 Jul 2006 18:18:48 +0200 levill_r (oln/j/15_oln.m4 1.38.1.14 600) @@ -650,6 +650,54 @@ AC_LANG_POP([C++]) ]) +# AC_SHARED_LDFLAGS + +# Queries the linker and set the required LDFLAGS for creating a +# shared library. + +# FIXME: This is a simple hack to have Swilena compile on our main +# targets (GNU/Linux/IA-32, Mac OS X/PowerPC). We should obviously +# use Libtool instead, as it handle a whole lot more +# linkers and parameters. + +AC_DEFUN([AC_SHARED_LDFLAGS], +[dnl + AC_CACHE_CHECK([for linker flags to create a shared library], + [ac_cv_ld_style], + [ac_cv_ld_style=unknown + # FIXME: We should not use a hard-coded name for the + # linker, but I can't find a means to get the (C++) linker + # from Autoconf. + if ld -v 2>&1 | grep -i "Apple Computer" >/dev/null 2>&1; + then + ac_cv_ld_style=Apple + elif ld -v 2>&1 | grep -i "GNU" >/dev/null 2>&1; then + ac_cv_ld_style=GNU + else + ac_cv_ld_style=other + fi]) + + case "$ac_cv_ld_style" in + GNU) + _SHARED_LDFLAGS="-shared" + ;; + Apple) + # Seen on http://www.penzilla.net/tutorials/python/swig/. + _SHARED_LDFLAGS="-bundle -flat_namespace -undefined suppress" + ;; + other) + # Default: assume we're using GNU ld. + _SHARED_LDFLAGS="-shared" + ;; + esac + + if test ! ${SHARED_LDFLAGS+set}; then + SHARED_LDFLAGS=$_SHARED_LDFLAGS + fi + + AC_SUBST([SHARED_LDFLAGS]) +]) + ### ### Internal stuff for Olena ###