wacky warning in 2.68...

[Miles Bader]

Recently I've started getting odd warnings from autoconf, and I'm not
sure how to shut them up... e.g., from the following "configure.ac" file:

   AC_INIT([barf], [0.1], [Miles Bader <address@hidden>])

   AC_PROG_CXX

   AC_LANG(C++)

   AC_DEFUN([BARF_CHECK_CXX_FLAG], [
       AC_LANG_ASSERT(C++)
       _SAVED_CXXFLAGS="$CXXFLAGS"
       OPT="$2"
       CXXFLAGS="$CXXFLAGS $OPT"
       case "$OPT" in *' '*) S=s;; *) S="";; esac
       AC_MSG_CHECKING([whether C++ compiler accepts "$OPT" option$S])
       AC_COMPILE_IFELSE(AC_LANG_SOURCE([int x;]), [opt_ok=yes], [opt_ok=no])
       AC_MSG_RESULT([$opt_ok])
       if test "$opt_ok" = yes; then
         AC_SUBST([$1], ["$OPT"])
       fi
       CXXFLAGS="$_SAVED_CXXFLAGS"
   ])

   BARF_CHECK_CXX_FLAG([BARF], "-march=native")

I get the following warnings from running "autoconf":

   configure.ac:24: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected 
in body
   ../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
   ../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
   ../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
   configure.ac:7: BARF_CHECK_CXX_FLAG is expanded from...
   configure.ac:24: the top level

AFAICS, I _am_ using AC_LANG_SOURCE, so ... I dunno why it's
complaining...

Thanks,

-Miles

-- 
Non-combatant, n. A dead Quaker.