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