From c35dbd0a66f5abede84a4ea966bd765ed6942edb Mon Sep 17 00:00:00 2001 From: Jozsef Kadlecsik Date: Sat, 18 Dec 2010 22:54:49 +0100 Subject: Use configure to detect compiler warning flags By checking the supported compiler warning flags, different gcc releases are supported without the crude --disable-extra-flags option. --- m4/ax_cflags_gcc_option.m4 | 225 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 225 insertions(+) create mode 100644 m4/ax_cflags_gcc_option.m4 (limited to 'm4') diff --git a/m4/ax_cflags_gcc_option.m4 b/m4/ax_cflags_gcc_option.m4 new file mode 100644 index 0000000..8cffe5d --- /dev/null +++ b/m4/ax_cflags_gcc_option.m4 @@ -0,0 +1,225 @@ +# =========================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_cflags_gcc_option.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]]) +# +# DESCRIPTION +# +# AX_CFLAGS_GCC_OPTION(-fomit-frame-pointer) would show a message like +# "checking CFLAGS for gcc -fomit-frame-pointer ... yes" and add the +# optionflag to CFLAGS if it is understood. You can override the +# shellvar-default of CFLAGS of course. The order of arguments stems from +# the explicit macros like AX_CFLAGS_WARN_ALL. +# +# The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add to +# CXXFLAGS - and it uses the autoconf setup for C++ instead of C (since it +# is possible to use different compilers for C and C++). +# +# The macro is a lot simpler than any special AX_CFLAGS_* macro (or +# ax_cxx_rtti.m4 macro) but allows to check for arbitrary options. +# However, if you use this macro in a few places, it would be great if you +# would make up a new function-macro and submit it to the ac-archive. +# +# - $1 option-to-check-for : required ("-option" as non-value) +# - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case) +# - $3 action-if-found : add value to shellvariable +# - $4 action-if-not-found : nothing +# +# Note: in earlier versions, $1-$2 were swapped. We try to detect the +# situation and accept a $2=~/-/ as being the old option-to-check-for. +# +# There are other variants that emerged from the original macro variant +# which did just test an option to be possibly added. However, some +# compilers accept an option silently, or possibly for just another option +# that was not intended. Therefore, we have to do a generic test for a +# compiler family. For gcc we check "-pedantic" being accepted which is +# also understood by compilers who just want to be compatible with gcc +# even when not being made from gcc sources. +# +# See also: AX_CFLAGS_SUN_OPTION, AX_CFLAGS_HPUX_OPTION, +# AX_CFLAGS_AIX_OPTION, and AX_CFLAGS_IRIX_OPTION. +# +# LICENSE +# +# Copyright (c) 2008 Guido U. Draheim +# +# 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 3 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 . +# +# 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, even though portions of the text of the +# Macro appear in them. The GNU General Public License (GPL) does govern +# all other use of the material that constitutes the Autoconf Macro. +# +# This special exception to the GPL applies to versions of the Autoconf +# Macro released by the Autoconf Archive. When you make and distribute a +# modified version of the Autoconf Macro, you may extend this special +# exception to the GPL to apply to your modified version as well. + +#serial 13 + +AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl +AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl +AS_VAR_PUSHDEF([VAR],[ax_cv_cflags_gcc_option_$2])dnl +AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)], +VAR,[AS_VAR_SET([VAR],["no, unknown"]) + AC_LANG_SAVE + AC_LANG_C + ac_save_[]FLAGS="$[]FLAGS" +for ac_arg dnl +in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC + "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC + # +do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` + AC_TRY_COMPILE([],[return 0;], + [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]); break]) +done + FLAGS="$ac_save_[]FLAGS" + AC_LANG_RESTORE +]) +m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])]) +case ".$var" in + .ok|.ok,*) m4_ifvaln($3,$3) ;; + .|.no|.no,*) m4_ifvaln($4,$4) ;; + *) 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_GCC_OPTION_OLD], [dnl +AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl +AS_VAR_PUSHDEF([VAR],[ax_cv_cxxflags_gcc_option_$2])dnl +AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)], +VAR,[AS_VAR_SET([VAR],["no, unknown"]) + AC_LANG_SAVE + AC_LANG_CPLUSPLUS + ac_save_[]FLAGS="$[]FLAGS" +for ac_arg dnl +in "-pedantic -Werror % m4_ifval($2,$2,-option)" dnl GCC + "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete" dnl new GCC + # +do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` + AC_TRY_COMPILE([],[return 0;], + [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]); break]) +done + FLAGS="$ac_save_[]FLAGS" + AC_LANG_RESTORE +]) +m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])]) +case ".$var" in + .ok|.ok,*) m4_ifvaln($3,$3) ;; + .|.no|.no,*) m4_ifvaln($4,$4) ;; + *) 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 ------------------------------------------------------------------------- + +AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl +AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl +AS_VAR_PUSHDEF([VAR],[ax_cv_cflags_gcc_option_$1])dnl +AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)], +VAR,[AS_VAR_SET([VAR],["no, unknown"]) + AC_LANG_SAVE + AC_LANG_C + ac_save_[]FLAGS="$[]FLAGS" +for ac_arg dnl +in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC + "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC + # +do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` + AC_TRY_COMPILE([],[return 0;], + [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]); break]) +done + FLAGS="$ac_save_[]FLAGS" + AC_LANG_RESTORE +]) +m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])]) +case ".$var" in + .ok|.ok,*) m4_ifvaln($3,$3) ;; + .|.no|.no,*) m4_ifvaln($4,$4) ;; + *) m4_ifvaln($3,$3,[ + if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $var " 2>&1 >/dev/null + then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $var]) + else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $var"]) + m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,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_GCC_OPTION_NEW], [dnl +AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl +AS_VAR_PUSHDEF([VAR],[ax_cv_cxxflags_gcc_option_$1])dnl +AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)], +VAR,[AS_VAR_SET([VAR],["no, unknown"]) + AC_LANG_SAVE + AC_LANG_CPLUSPLUS + ac_save_[]FLAGS="$[]FLAGS" +for ac_arg dnl +in "-pedantic -Werror % m4_ifval($1,$1,-option)" dnl GCC + "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete" dnl new GCC + # +do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` + AC_TRY_COMPILE([],[return 0;], + [AS_VAR_SET([VAR],[`echo $ac_arg | sed -e 's,.*% *,,'`]); break]) +done + FLAGS="$ac_save_[]FLAGS" + AC_LANG_RESTORE +]) +m4_ifdef([AS_VAR_COPY],[AS_VAR_COPY([var],[VAR])],[var=AS_VAR_GET([VAR])]) +case ".$var" in + .ok|.ok,*) m4_ifvaln($3,$3) ;; + .|.no|.no,*) m4_ifvaln($4,$4) ;; + *) m4_ifvaln($3,$3,[ + if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $var " 2>&1 >/dev/null + then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $var]) + else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $var"]) + m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $var" + fi ]) ;; +esac +AS_VAR_POPDEF([VAR])dnl +AS_VAR_POPDEF([FLAGS])dnl +]) + +AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1, +[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])]) + +AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1, +[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])]) -- cgit v1.2.3