+# Some GCC invocations warn for converting function pointers to void *.
+# This is fair enough, as it's technically forbidden, but we use dlsym()
+# which can pretty much only exist if object and function pointers are
+# interconvertable. So we disable -Werror if need be.
+if test ! -z "$gcc_werror" && test "$ac_cv_func_dlfunc" != yes; then
+ CFLAGS="${CFLAGS} $gcc_werror"
+ AC_CACHE_CHECK([whether function pointers can be converted to void * without a warning],
+ [rjk_cv_function_pointer_cast],[
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
+ void somefunction(void);],
+ [(void *)somefunction])],
+ [rjk_cv_function_pointer_cast=yes],
+ [rjk_cv_function_pointer_cast=no])])
+ if test $rjk_cv_function_pointer_cast = no; then
+ gcc_werror=""
+ fi
+ CFLAGS="${old_CFLAGS}"
+fi
+