On Tue, 2012-07-31 at 08:33 +0800, Nor Jaidi Tuah wrote: > Dear all, > > My project (pasang-emas.sourceforge.net) uses automake, > using AM_PROG_VALAC macro in the configure.ac file. > It uses functions from Math (Math.sin, Math.hypot etc). > > Recently, one user complains that upon issuing > './configure' and 'make', he got the following error: > > /usr/bin/ld: note: 'hypot@@GLIBC_2.2.5' is defined in > DSO /lib64/libm.so.6 so try adding it to the linker command line > /lib64/libm.so.6: could not read symbols: Invalid operation > collect2: error: ld returned 1 exit status > make[2]: *** [pasang-emas] Error 1 > > He has to manually add -lm to the Makefile to > make 'make' work. > > My questions: > * Shouldn't AM_PROG_VALAC take care of adding -lm?
No, that macro just finds valac and checks the version. It has nothing to do with C flags or libraries. Since you're using the Vala support built into autotools you're actually circumventing all the relevant logic in valac. Autotools just uses valac -C to convert the vala to C then proceeds with the rest of the process exactly the same as with C, so you need to add any relevant CFLAGS and LDFLAGS just as you would for a C project. See http://code.google.com/p/bump/source/browse/bump/Makefile.am#94 for an example. > * Why it works on my computer? I check my Makefile, > and there is no -lm. I seem to remember that on certain platforms math functions are included in libc and adding libm isn't necessary. It's probably not a good idea to rely on that and either always pass -lm or use AC_CHECK_LIB (or something similar) to find out whether or not you need it. -Evan _______________________________________________ vala-list mailing list vala-list@gnome.org https://mail.gnome.org/mailman/listinfo/vala-list
