1# Autoconf include file defining macros related to compile-time warnings.
2
3# Copyright 2004, 2005 Free Software Foundation, Inc.
4
5#This file is part of GCC.
6
7#GCC is free software; you can redistribute it and/or modify it under
8#the terms of the GNU General Public License as published by the Free
9#Software Foundation; either version 2, or (at your option) any later
10#version.
11
12#GCC is distributed in the hope that it will be useful, but WITHOUT
13#ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14#FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15#for more details.
16
17#You should have received a copy of the GNU General Public License
18#along with GCC; see the file COPYING.  If not, write to the Free
19#Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
20#02110-1301, USA.
21
22# ACX_PROG_CC_WARNING_OPTS([-Wfoo -Wbar -Wbaz])
23#   Sets @WARN_CFLAGS@ to the subset of the given options which the
24#   compiler accepts.
25AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],
26[AC_REQUIRE([AC_PROG_CC])dnl
27AC_SUBST([WARN_CFLAGS])dnl
28WARN_CFLAGS=
29save_CFLAGS="$CFLAGS"
30for option in $1; do
31  AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
32  AC_CACHE_CHECK([whether $CC supports $option], acx_Woption,
33    [CFLAGS="$option"
34    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
35      [AS_VAR_SET(acx_Woption, yes)],
36      [AS_VAR_SET(acx_Woption, no)])
37  ])
38  AS_IF([test AS_VAR_GET(acx_Woption) = yes],
39        [WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"])
40  AS_VAR_POPDEF([acx_Woption])dnl
41done
42CFLAGS="$save_CFLAGS"
43])# ACX_PROG_CC_WARNING_OPTS
44
45# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long ...])
46#   Sets WARN_PEDANTIC to "-pedantic" + the argument, if the compiler is GCC
47#   and accepts all of those options simultaneously, otherwise to nothing.
48AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC],
49[AC_REQUIRE([AC_PROG_CC])dnl
50AC_SUBST([WARN_PEDANTIC])dnl
51AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl
52WARN_PEDANTIC=
53AS_IF([test "$GCC" = yes],
54[AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic,
55[save_CFLAGS="$CFLAGS"
56CFLAGS="-pedantic $1"
57AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
58   [AS_VAR_SET(acx_Pedantic, yes)],
59   [AS_VAR_SET(acx_Pedantic, no)])
60CFLAGS="$save_CFLAGS"])
61AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
62      [WARN_PEDANTIC="-pedantic $1"])
63])
64AS_VAR_POPDEF([acx_Pedantic])dnl
65])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC
66
67# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z])
68#   sets WERROR to "-Werror" if the compiler is GCC >=x.y.z, or if
69#   --enable-werror-always was given on the command line, otherwise
70#   to nothing.
71#   If the argument is the word "manual" instead of a version number,
72#   then WERROR will be set to -Werror only if --enable-werror-always
73#   appeared on the configure command line.
74AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS],
75[AC_REQUIRE([AC_PROG_CC])dnl
76AC_SUBST([WERROR])dnl
77WERROR=
78AC_ARG_ENABLE(werror-always, 
79    AS_HELP_STRING([--enable-werror-always],
80		   [enable -Werror despite compiler version]),
81[], [enable_werror_always=no])
82AS_IF([test $enable_werror_always = yes],
83      [WERROR=-Werror],
84 m4_if($1, [manual],,
85 [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl
86  AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers,
87    [set fnord `echo $1 | tr '.' ' '`
88     shift
89     AC_PREPROC_IFELSE(
90[#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \
91  < [$]1 * 10000 + [$]2 * 100 + [$]3
92#error insufficient
93#endif],
94   [AS_VAR_SET(acx_GCCvers, yes)],
95   [AS_VAR_SET(acx_GCCvers, no)])])
96 AS_IF([test AS_VAR_GET(acx_GCCvers) = yes],
97       [WERROR=-WerrorB])
98  AS_VAR_POPDEF([acx_GCCvers])]))
99])# ACX_PROG_CC_WARNINGS_ARE_ERRORS
100