| AC_DEFUN([NM_COMPILER_WARNINGS], |
| [AC_ARG_ENABLE(more-warnings, |
| AS_HELP_STRING([--enable-more-warnings], [Maximum compiler warnings]), |
| set_more_warnings="$enableval",set_more_warnings=yes) |
| AC_MSG_CHECKING(for more warnings, including -Werror) |
| if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then |
| AC_MSG_RESULT(yes) |
| CFLAGS="-Wall -Werror -std=gnu89 $CFLAGS" |
| |
| for option in -Wmissing-declarations -Wmissing-prototypes \ |
| -Wdeclaration-after-statement -Wstrict-prototypes \ |
| -Wno-unused-parameter -Wno-sign-compare \ |
| -fno-strict-aliasing -Wno-deprecated-declarations; do |
| SAVE_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS $option" |
| AC_MSG_CHECKING([whether gcc understands $option]) |
| AC_TRY_COMPILE([], [], |
| has_option=yes, |
| has_option=no,) |
| if test $has_option = no; then |
| CFLAGS="$SAVE_CFLAGS" |
| fi |
| AC_MSG_RESULT($has_option) |
| unset has_option |
| unset SAVE_CFLAGS |
| done |
| unset option |
| else |
| AC_MSG_RESULT(no) |
| fi |
| ]) |
