1# ===========================================================================
2#       http://www.nongnu.org/autoconf-archive/ax_cflags_warn_all.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_CFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
8#
9# DESCRIPTION
10#
11#   Try to find a compiler option that enables most reasonable warnings.
12#
13#   For the GNU CC compiler it will be -Wall (and -ansi -pedantic) The
14#   result is added to the shellvar being CFLAGS by default.
15#
16#   Currently this macro knows about GCC, Solaris C compiler, Digital Unix C
17#   compiler, C for AIX Compiler, HP-UX C compiler, IRIX C compiler, NEC
18#   SX-5 (Super-UX 10) C compiler, and Cray J90 (Unicos 10.0.0.8) C
19#   compiler.
20#
21#    - $1 shell-variable-to-add-to : CFLAGS
22#    - $2 add-value-if-not-found : nothing
23#    - $3 action-if-found : add value to shellvariable
24#    - $4 action-if-not-found : nothing
25#
26# LICENSE
27#
28#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
29#
30#   This program is free software; you can redistribute it and/or modify it
31#   under the terms of the GNU General Public License as published by the
32#   Free Software Foundation; either version 2 of the License, or (at your
33#   option) any later version.
34#
35#   This program is distributed in the hope that it will be useful, but
36#   WITHOUT ANY WARRANTY; without even the implied warranty of
37#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
38#   Public License for more details.
39#
40#   You should have received a copy of the GNU General Public License along
41#   with this program. If not, see <http://www.gnu.org/licenses/>.
42#
43#   As a special exception, the respective Autoconf Macro's copyright owner
44#   gives unlimited permission to copy, distribute and modify the configure
45#   scripts that are the output of Autoconf when processing the Macro. You
46#   need not follow the terms of the GNU General Public License when using
47#   or distributing such scripts, even though portions of the text of the
48#   Macro appear in them. The GNU General Public License (GPL) does govern
49#   all other use of the material that constitutes the Autoconf Macro.
50#
51#   This special exception to the GPL applies to versions of the Autoconf
52#   Macro released by the Autoconf Archive. When you make and distribute a
53#   modified version of the Autoconf Macro, you may extend this special
54#   exception to the GPL to apply to your modified version as well.
55
56AC_DEFUN([AX_CFLAGS_WARN_ALL],[dnl
57AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
58AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_warn_all])dnl
59AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
60VAR,[VAR="no, unknown"
61 AC_LANG_SAVE
62 AC_LANG_C
63 ac_save_[]FLAGS="$[]FLAGS"
64for ac_arg dnl
65in "-pedantic  % -Wall"       dnl   GCC
66   "-xstrconst % -v"          dnl Solaris C
67   "-std1      % -verbose -w0 -warnprotos" dnl Digital Unix
68   "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
69   "-ansi -ansiE % -fullwarn" dnl IRIX
70   "+ESlit     % +w1"         dnl HP-UX C
71   "-Xc        % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
72   "-h conform % -h msglevel 2" dnl Cray C (Unicos)
73   #
74do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
75   AC_TRY_COMPILE([],[return 0;],
76   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
77done
78 FLAGS="$ac_save_[]FLAGS"
79 AC_LANG_RESTORE
80])
81case ".$VAR" in
82     .ok|.ok,*) m4_ifvaln($3,$3) ;;
83   .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
84        AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
85                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
86   *) m4_ifvaln($3,$3,[
87   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
88   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
89   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
90                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
91   fi ]) ;;
92esac
93AS_VAR_POPDEF([VAR])dnl
94AS_VAR_POPDEF([FLAGS])dnl
95])
96
97dnl the only difference - the LANG selection... and the default FLAGS
98
99AC_DEFUN([AX_CXXFLAGS_WARN_ALL],[dnl
100AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
101AS_VAR_PUSHDEF([VAR],[ax_cv_cxxflags_warn_all])dnl
102AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
103VAR,[VAR="no, unknown"
104 AC_LANG_SAVE
105 AC_LANG_CPLUSPLUS
106 ac_save_[]FLAGS="$[]FLAGS"
107for ac_arg dnl
108in "-pedantic  % -Wall"       dnl   GCC
109   "-xstrconst % -v"          dnl Solaris C
110   "-std1      % -verbose -w0 -warnprotos" dnl Digital Unix
111   "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
112   "-ansi -ansiE % -fullwarn" dnl IRIX
113   "+ESlit     % +w1"         dnl HP-UX C
114   "-Xc        % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
115   "-h conform % -h msglevel 2" dnl Cray C (Unicos)
116   #
117do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
118   AC_TRY_COMPILE([],[return 0;],
119   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
120done
121 FLAGS="$ac_save_[]FLAGS"
122 AC_LANG_RESTORE
123])
124case ".$VAR" in
125     .ok|.ok,*) m4_ifvaln($3,$3) ;;
126   .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
127        AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
128                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
129   *) m4_ifvaln($3,$3,[
130   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
131   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
132   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
133                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
134   fi ]) ;;
135esac
136AS_VAR_POPDEF([VAR])dnl
137AS_VAR_POPDEF([FLAGS])dnl
138])
139
140dnl  implementation tactics:
141dnl   the for-argument contains a list of options. The first part of
142dnl   these does only exist to detect the compiler - usually it is
143dnl   a global option to enable -ansi or -extrawarnings. All other
144dnl   compilers will fail about it. That was needed since a lot of
145dnl   compilers will give false positives for some option-syntax
146dnl   like -Woption or -Xoption as they think of it is a pass-through
147dnl   to later compile stages or something. The "%" is used as a
148dnl   delimimiter. A non-option comment can be given after "%%" marks
149dnl   which will be shown but not added to the respective C/CXXFLAGS.
150