Re: complex configure tests involving multiple files and possibly libtool/automake
On 01/27/2017 07:42 AM, Eric Blake wrote: On 01/26/2017 02:35 AM, Václav Haisman wrote: Hi. I have a test that I would like to run during configure time which basically involves compiling two files and linking a shared object/DLL out of them. I think I would like to be using automake/libtool to These macros use libtool to link in configure tests. There might be some cherries to steal: http://dev.thep.lu.se/yat/svn/trunk/m4/yat_lt_link_ifelse.m4 Cheers, Peter ___ Autoconf mailing list Autoconf@gnu.org https://lists.gnu.org/mailman/listinfo/autoconf
Re: complex configure tests involving multiple files and possibly libtool/automake
On 01/26/2017 03:42 PM, Eric Blake wrote: > > I'm not directly aware of a way to do it, but you CAN use AC_TRY_COMPILE > and then in the 'action-if-true' branch you can copy conftest.o to a > safe location, then try and figure out how to make the subsequent > AC_TRY_LINK refer back to the .o file that you squirreled away. You'll > have to experiment if you can't find an actual example, and if you get > it working, be sure to post back to the list, but I hope that gives you > some hints of things to try. Correction - use the modern macros instead. In fact, AC_COMPILE_IFELSE already documents that you can access conftest.$OBJEXT in the action-if-true block, so it is a supported interface: https://www.gnu.org/software/autoconf/manual/autoconf.html#Running-the-Compiler -- Eric Blake eblake redhat com+1-919-301-3266 Libvirt virtualization library http://libvirt.org signature.asc Description: OpenPGP digital signature ___ Autoconf mailing list Autoconf@gnu.org https://lists.gnu.org/mailman/listinfo/autoconf
Re: complex configure tests involving multiple files and possibly libtool/automake
On 01/26/2017 02:35 AM, Václav Haisman wrote: > Hi. > > I have a test that I would like to run during configure time which > basically involves compiling two files and linking a shared object/DLL > out of them. I think I would like to be using automake/libtool to > compile and link the configure test itself. Is there a good practice > or good example on how to do this? I'm not directly aware of a way to do it, but you CAN use AC_TRY_COMPILE and then in the 'action-if-true' branch you can copy conftest.o to a safe location, then try and figure out how to make the subsequent AC_TRY_LINK refer back to the .o file that you squirreled away. You'll have to experiment if you can't find an actual example, and if you get it working, be sure to post back to the list, but I hope that gives you some hints of things to try. > > Before you comment, no, simple single file compile and link will not > do. This is in attempt to detect issue on Cygwin with C++11 > `thread_local`. See > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697#. > -- Eric Blake eblake redhat com+1-919-301-3266 Libvirt virtualization library http://libvirt.org signature.asc Description: OpenPGP digital signature ___ Autoconf mailing list Autoconf@gnu.org https://lists.gnu.org/mailman/listinfo/autoconf
