On Wed, Jan 24, 2018 at 4:36 PM, Ferenc Wágner <wferi@xxxxxxx> wrote: > Hi, > > Since ceil() can be inlined when optimization is enabled, I use > > AC_SEARCH_LIBS([ceil], [m], , [AC_MSG_ERROR([ceil not found])]) > AC_SUBST([m_LIBS], [$LIBS]) > > to link against libm only when necessary (that is, when ceil is not > inlined). However, it does not work because GCC says in config.log: > > conftest.c:76:6: warning: conflicting types for built-in function 'ceil' > char ceil (); > ~~~~ > > and inlining is disabled, thus ceil becomes an undefined reference > without -lm. However, in the actual code where math.h is #included, the > above warning does not happen, ceil is inlined and I unnecessarily link > with -lm. How could I overcome this? You could try setting -Wl,--as-needed (which really should be the default) in your makefiles. zw _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf
