AX_CFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
, 

2006-12-12

Guido U. Draheim <guidod@gmx.de>

GPLWithACException
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts

guidod's C Support (released)

Try to find a compiler option that enables most reasonable warnings. This macro is directly derived from VL_PROG_CC_WARNINGS which is split up into two AX_CFLAGS_WARN_ALL and AX_CFLAGS_WARN_ALL_ANSI

For the GNU CC compiler it will be -Wall (and -ansi -pedantic) The result is added to the shellvar being CFLAGS by default.

Currently this macro knows about GCC, Solaris C compiler, Digital Unix C compiler, C for AIX Compiler, HP-UX C compiler, IRIX C compiler, NEC SX-5 (Super-UX 10) C compiler, and Cray J90 (Unicos 10.0.0.8) C compiler.

• - $1 shell-variable-to-add-to : CFLAGS

• - $2 add-value-if-not-found : nothing

• - $3 action-if-found : add value to shellvariable

• - $4 action-if-not-found : nothing

AC_DEFUN([AX_CFLAGS_WARN_ALL],[dnl
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_warn_all])dnl
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
VAR,[VAR="no, unknown"
 AC_LANG_SAVE
 AC_LANG_C
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic  % -Wall"       dnl   GCC
   "-xstrconst % -v"          dnl Solaris C
   "-std1      % -verbose -w0 -warnprotos" dnl Digital Unix
   "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
   "-ansi -ansiE % -fullwarn" dnl IRIX
   "+ESlit     % +w1"         dnl HP-UX C
   "-Xc        % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
   "-h conform % -h msglevel 2" dnl Cray C (Unicos)
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_TRY_COMPILE([],[return 0;],
   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
case ".$VAR" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
        AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])

dnl the only difference - the LANG selection... and the default FLAGS

AC_DEFUN([AX_CXXFLAGS_WARN_ALL],[dnl
AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_warn_all])dnl
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
VAR,[VAR="no, unknown"
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic  % -Wall"       dnl   GCC
   "-xstrconst % -v"          dnl Solaris C
   "-std1      % -verbose -w0 -warnprotos" dnl Digital Unix
   "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
   "-ansi -ansiE % -fullwarn" dnl IRIX
   "+ESlit     % +w1"         dnl HP-UX C
   "-Xc        % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
   "-h conform % -h msglevel 2" dnl Cray C (Unicos)
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_TRY_COMPILE([],[return 0;],
   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
case ".$VAR" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
        AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])

dnl  implementation tactics:
dnl   the for-argument contains a list of options. The first part of
dnl   these does only exist to detect the compiler - usually it is
dnl   a global option to enable -ansi or -extrawarnings. All other
dnl   compilers will fail about it. That was needed since a lot of
dnl   compilers will give false positives for some option-syntax
dnl   like -Woption or -Xoption as they think of it is a pass-through
dnl   to later compile stages or something. The "%" is used as a
dnl   delimimiter. A non-option comment can be given after "%%" marks
dnl   which will be shown but not added to the respective C/CXXFLAGS.