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# ax_cflags_warn_all_ansi

## Synopsis

`AX_CFLAGS_WARN_ALL_ANSI [(shellvar [,default, [A/NA]])]`

## Description

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

## Author

Guido U. Draheim <guidod@gmx.de>

## Last Modified

2008-04-12

## Cross References

## M4 Source Code

    AC_DEFUN([AX_CFLAGS_WARN_ALL_ANSI],[dnl
    AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
    AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_warn_all_ansi])dnl
    AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum ansi warnings],
    VAR,[VAR="no, unknown"
     AC_LANG_SAVE
     AC_LANG_C
     ac_save_[]FLAGS="$[]FLAGS"
    # IRIX C compiler:
    #      -use_readonly_const is the default for IRIX C,
    #       puts them into .rodata, but they are copied later.
    #       need to be "-G0 -rdatashared" for strictmode but
    #       I am not sure what effect that has really.         - guidod
    for ac_arg dnl
    in "-pedantic  % -Wall -ansi -pedantic"       dnl   GCC
       "-xstrconst % -v -Xc"                      dnl Solaris C
       "-std1      % -verbose -w0 -warnprotos -std1" dnl Digital Unix
       " % -qlanglvl=ansi -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
       " % -ansi -ansiE -fullwarn"                dnl IRIX
       "+ESlit     % +w1 -Aa"                     dnl HP-UX C
       "-Xc        % -pvctl[,]fullmsg -Xc"        dnl NEC SX-5 (Super-UX 10)
       "-h conform % -h msglevel 2 -h conform"    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_ANSI],[dnl
    AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
    AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_warn_all_ansi])dnl
    AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum ansi warnings],
    VAR,[VAR="no, unknown"
     AC_LANG_SAVE
     AC_LANG_CPLUSPLUS
     ac_save_[]FLAGS="$[]FLAGS"
    # IRIX C compiler:
    #      -use_readonly_const is the default for IRIX C,
    #       puts them into .rodata, but they are copied later.
    #       need to be "-G0 -rdatashared" for strictmode but
    #       I am not sure what effect that has really.         - guidod
    for ac_arg dnl
    in "-pedantic  % -Wall -ansi -pedantic"       dnl   GCC
       "-xstrconst % -v -Xc"                      dnl Solaris C
       "-std1      % -verbose -w0 -warnprotos -std1" dnl Digital Unix
       " % -qlanglvl=ansi -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
       " % -ansi -ansiE -fullwarn"                dnl IRIX
       "+ESlit     % +w1 -Aa"                     dnl HP-UX C
       "-Xc        % -pvctl[,]fullmsg -Xc"        dnl NEC SX-5 (Super-UX 10)
       "-h conform % -h msglevel 2 -h conform"    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
    ])

## License

Copyright © 2008 Guido U. Draheim <guidod@gmx.de>

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; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.

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