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|
dnl as-ac-expand.m4 0.2.0
dnl autostars m4 macro for expanding directories using configure's prefix
dnl thomas@apestaart.org
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
])
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)
])
|
