Hello,
In [1] I started discussion about how to cancel flags set by
AC_LANG_WERROR, in [2] there was one proposition how to improve
this macro.
What do you think about the following backward compatible changes
(read updated info for the details)?
I removed m4_divert_text([DEFAULTS], [ac_[]_AC_LANG_ABBREV[]_werror_flag=])
from AC_LANG_WERROR. Is it really needed?
lang.m4:
# AC_LANG_WERROR([VALUE])
# -----------------------
# How to treat warnings from the current language's preprocessor, compiler,
# and linker:
# 1. No arguments: treat warnings as fatal errors.
# 2. One argument: on -- treat, off -- do not treat warnings as fatal errors.
AC_DEFUN([AC_LANG_WERROR],
[m4_if(
$#, 1, [m4_if(
[$1], [on], [ac_[]_AC_LANG_ABBREV[]_werror_flag=yes],
[$1], [off], [ac_[]_AC_LANG_ABBREV[]_werror_flag=],
[m4_fatal([$0: wrong argument: `$1'])])],
$#, 0, [ac_[]_AC_LANG_ABBREV[]_werror_flag=yes],
[m4_fatal([$0: incorrect number of arguments: $#])])
])# AC_LANG_WERROR
autoconf.texi:
@defmac AC_LANG_WERROR (@ovar{value})
@acindex{LANG_WERROR}
Normally Autoconf ignores warnings generated by the compiler, linker, and
preprocessor. If @var{value} is @code{on} or if an optional argument
is not given, then warnings are treated as fatal errors for the current
language. If @var{value} is @code{off}, then the default behaviour is
restored. This macro is useful when the
results of configuration are used where warnings are unacceptable; for
instance, if parts of a program are built with the @acronym{GCC}
@option{-Werror}
option. If the whole program is built using @option{-Werror} it is
often simpler to put @option{-Werror} in the compiler flags (@code{CFLAGS},
etc.).
@end defmac
[1] http://lists.gnu.org/archive/html/autoconf/2006-12/msg00091.html
[2] http://lists.gnu.org/archive/html/autoconf/2007-01/msg00077.html
_______________________________________________
Autoconf mailing list
Autoconf@xxxxxxx
http://lists.gnu.org/mailman/listinfo/autoconf
