dnl EXTRA_COMPILE_WARNINGS dnl Turn on many useful compiler warnings dnl For now, only works on GCC AC_DEFUN([EXTRA_COMPILE_WARNINGS],[ dnl ****************************** dnl More compiler warnings dnl ****************************** AC_ARG_ENABLE(compile-warnings, AC_HELP_STRING([--enable-compile-warnings=@<:@no/minimum/yes/maximum/error@:>@], [Turn on compiler warnings]),, [enable_compile_warnings="m4_default([$1],[yes])"]) warnCFLAGS= if test "x$GCC" != xyes; then enable_compile_warnings=no fi warning_flags= realsave_CFLAGS="$CFLAGS" case "$enable_compile_warnings" in no) warning_flags= ;; minimum) warning_flags="-Wall" ;; yes) warning_flags="-Wall -Wmissing-prototypes" ;; maximum|error) warning_flags="-Wall -Wmissing-prototypes -Wnested-externs -Wpointer-arith" CFLAGS="$warning_flags $CFLAGS" for option in -Wno-sign-compare; do SAVE_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $option" AC_MSG_CHECKING([whether gcc understands $option]) AC_TRY_COMPILE([], [], has_option=yes, has_option=no,) CFLAGS="$SAVE_CFLAGS" AC_MSG_RESULT($has_option) if test $has_option = yes; then warning_flags="$warning_flags $option" fi unset has_option unset SAVE_CFLAGS done unset option if test "$enable_compile_warnings" = "error" ; then warning_flags="$warning_flags -Werror" fi ;; *) AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings) ;; esac CFLAGS="$realsave_CFLAGS" AC_MSG_CHECKING(what warning flags to pass to the C compiler) AC_MSG_RESULT($warning_flags) AC_ARG_ENABLE(iso-c, AC_HELP_STRING([--enable-iso-c], [Try to warn if code is not ISO C ]),, [enable_iso_c=no]) AC_MSG_CHECKING(what language compliance flags to pass to the C compiler) complCFLAGS= if test "x$enable_iso_c" != "xno"; then if test "x$GCC" = "xyes"; then case " $CFLAGS " in *[\ \ ]-ansi[\ \ ]*) ;; *) complCFLAGS="$complCFLAGS -ansi" ;; esac case " $CFLAGS " in *[\ \ ]-pedantic[\ \ ]*) ;; *) complCFLAGS="$complCFLAGS -pedantic" ;; esac fi fi AC_MSG_RESULT($complCFLAGS) WARN_CFLAGS="$warning_flags $complCFLAGS" AC_SUBST(WARN_CFLAGS) ]) dnl as-ac-expand.m4 0.2.0 -*- autoconf -*- dnl autostars m4 macro for expanding directories using configure's prefix dnl (C) 2003, 2004, 2005 Thomas Vander Stichele <thomas at apestaart dot org> dnl Copying and distribution of this file, with or without modification, dnl are permitted in any medium without royalty provided the copyright dnl notice and this notice are preserved. dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR) dnl example: dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir) dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local AC_DEFUN([AS_AC_EXPAND], [ EXP_VAR=[$1] FROM_VAR=[$2] dnl first expand prefix and exec_prefix if necessary prefix_save=$prefix exec_prefix_save=$exec_prefix dnl if no prefix given, then use /usr/local, the default prefix if test "x$prefix" = "xNONE"; then prefix="$ac_default_prefix" fi dnl if no exec_prefix given, then use prefix if test "x$exec_prefix" = "xNONE"; then exec_prefix=$prefix fi full_var="$FROM_VAR" dnl loop until it doesn't change anymore while true; do new_full_var="`eval echo $full_var`" if test "x$new_full_var" = "x$full_var"; then break; fi full_var=$new_full_var done dnl clean up full_var=$new_full_var AC_SUBST([$1], "$full_var") dnl restore prefix and exec_prefix prefix=$prefix_save exec_prefix=$exec_prefix_save ])