Hi Bruno, * Bruno Haible wrote on Sat, Mar 20, 2010 at 11:52:25PM CET: > lib-ignore: Determine different options for different compilers. > * m4/lib-ignore.m4 (gl_IGNORE_UNUSED_LIBRARIES): Set a variable which > depends on the current language (C/C++/Fortran). Don't set LDFLAGS. > Add comments. > (_gl_IGNORE_UNUSED_LIBRARIES_OPTIONS): New macro. > * NEWS: Mention the change.
This patch looks good to me, except that I didn't think of another complication: when libtool is used to create a shared library, it will honor and translate '-Wl,-z,ignore' to '-Qoption ld -z -Qoption ld ignore' if needed, but it will drop a '-Qoption ld -z,ignore' on the command line. This only concerns library creation, not program creation. This is arguably a limitation in libtool; I'm not sure whether it is the best idea to fix libtool, but that could be done. WDYT? The other very minor nit that I can think of is that the $wl issue is more general than just only for lib-ignore.m4 -- it basically concerns all linker flags that you ever need. One generalization could be to require libtool or config.rpath, and use information from that. Autoconf does not document either of _AC_LANG_ABBREV _AC_LANG_PREFIX _AC_LANG _AC_LANG_DISPATCH all of which are needed in order to write a patch like this. We could add a section about low-level language flags in autoconf.texi (when and if we're ready to commit to semantics). Thank you, Ralf
