2012/10/17 Eric Blake <eblake@xxxxxxxxxx>: > On 10/17/2012 02:15 PM, Sergio Belkin wrote: >> Hi folks, >> >> I've found in AC_SEARCH_LIBS functions ac_lib and ac_res what do they do? > > They aren't documented in the manual, so you can assume that they are > used internally for implementing the actual search, and that you can > (and should!) safely ignore them. If you're still more curious than > that, then read the source code: ac_lib is the shell variable that loops > over the 2nd argument passed to the AC_SEARCH_LIBS macro, and ac_res is > the shell variable that tracks which -l library, if any, was needed to > make the link succeed. > > AC_DEFUN([AC_SEARCH_LIBS], > [AS_VAR_PUSHDEF([ac_Search], [ac_cv_search_$1])dnl > AC_CACHE_CHECK([for library containing $1], [ac_Search], > [ac_func_search_save_LIBS=$LIBS > AC_LANG_CONFTEST([AC_LANG_CALL([], [$1])]) > for ac_lib in '' $2; do > if test -z "$ac_lib"; then > ac_res="none required" > else > ac_res=-l$ac_lib > LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS" > fi > AC_LINK_IFELSE([], [AS_VAR_SET([ac_Search], [$ac_res])]) > AS_VAR_SET_IF([ac_Search], [break]) > done > > -- > Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > Thanks for you explanation, I didn''t understand well what does "none required". I've found "The result of this test is cached in the ac_cv_search_function variable as ‘none required’ if function is already available" at http://www.manpagez.com/info/autoconf/autoconf-2.69/autoconf_46.php So I understand that function was found in the library searched on in another in the system, wasn't it? Thanks in advance! -- -- Sergio Belkin http://www.sergiobelkin.com Watch More TV http://sebelk.blogspot.com LPIC-2 Certified - http://www.lpi.org _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf
