1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_cflags_warn_all.html
3 # ===========================================================================
7 # AX_CFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
11 # Try to find a compiler option that enables most reasonable warnings.
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.
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
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
28 # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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.
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.
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/>.
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.
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.
58 AC_DEFUN([AX_CFLAGS_WARN_ALL],[dnl
59 AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
60 AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_warn_all])dnl
61 AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
62 VAR,[VAR="no, unknown"
65 ac_save_[]FLAGS="$[]FLAGS"
67 in "-pedantic % -Wall" dnl GCC
68 "-xstrconst % -v" dnl Solaris C
69 "-std1 % -verbose -w0 -warnprotos" dnl Digital Unix
70 "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
71 "-ansi -ansiE % -fullwarn" dnl IRIX
72 "+ESlit % +w1" dnl HP-UX C
73 "-Xc % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
74 "-h conform % -h msglevel 2" dnl Cray C (Unicos)
76 do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
77 AC_TRY_COMPILE([],[return 0;],
78 [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
80 FLAGS="$ac_save_[]FLAGS"
84 .ok|.ok,*) m4_ifvaln($3,$3) ;;
85 .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
86 AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
87 m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
89 if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
90 then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
91 else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
92 m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
95 AS_VAR_POPDEF([VAR])dnl
96 AS_VAR_POPDEF([FLAGS])dnl
99 dnl the only difference - the LANG selection... and the default FLAGS
101 AC_DEFUN([AX_CXXFLAGS_WARN_ALL],[dnl
102 AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
103 AS_VAR_PUSHDEF([VAR],[ax_cv_cxxflags_warn_all])dnl
104 AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
105 VAR,[VAR="no, unknown"
108 ac_save_[]FLAGS="$[]FLAGS"
110 in "-pedantic % -Wall" dnl GCC
111 "-xstrconst % -v" dnl Solaris C
112 "-std1 % -verbose -w0 -warnprotos" dnl Digital Unix
113 "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
114 "-ansi -ansiE % -fullwarn" dnl IRIX
115 "+ESlit % +w1" dnl HP-UX C
116 "-Xc % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
117 "-h conform % -h msglevel 2" dnl Cray C (Unicos)
119 do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
120 AC_TRY_COMPILE([],[return 0;],
121 [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
123 FLAGS="$ac_save_[]FLAGS"
127 .ok|.ok,*) m4_ifvaln($3,$3) ;;
128 .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
129 AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
130 m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
132 if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
133 then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
134 else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
135 m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
138 AS_VAR_POPDEF([VAR])dnl
139 AS_VAR_POPDEF([FLAGS])dnl
142 dnl implementation tactics:
143 dnl the for-argument contains a list of options. The first part of
144 dnl these does only exist to detect the compiler - usually it is
145 dnl a global option to enable -ansi or -extrawarnings. All other
146 dnl compilers will fail about it. That was needed since a lot of
147 dnl compilers will give false positives for some option-syntax
148 dnl like -Woption or -Xoption as they think of it is a pass-through
149 dnl to later compile stages or something. The "%" is used as a
150 dnl delimimiter. A non-option comment can be given after "%%" marks
151 dnl which will be shown but not added to the respective C/CXXFLAGS.