From e6d847d8c463d3577fd2eb9810bf6e49c530cc10 Mon Sep 17 00:00:00 2001
From: James Peach <jpeach@samba.org>
Date: Thu, 9 Feb 2006 23:04:38 +0000
Subject: r13418: Formalise support for checking compiler options. (This used
 to be commit eb3ba826ef465b95f9597043ee156ad9d7ca16a0)

---
 source3/aclocal.m4   |  12 -
 source3/compiler.m4  | 990 +++++++++++++++++++++++++++++++++++++++++++++++++++
 source3/configure.in | 113 +++---
 3 files changed, 1040 insertions(+), 75 deletions(-)
 create mode 100644 source3/compiler.m4

diff --git a/source3/aclocal.m4 b/source3/aclocal.m4
index 86c43f80dc..3d6642d373 100644
--- a/source3/aclocal.m4
+++ b/source3/aclocal.m4
@@ -76,18 +76,6 @@ AC_DEFUN(SMB_SUBSYSTEM,
     	ifelse([$2], , :, [rm -f $2])
 ])
 
-dnl AC_PROG_CC_FLAG(flag)
-AC_DEFUN(AC_PROG_CC_FLAG,
-[AC_CACHE_CHECK(whether ${CC-cc} accepts -$1, ac_cv_prog_cc_$1,
-[echo 'void f(){}' > conftest.c
-if test -z "`${CC-cc} -$1 -c conftest.c 2>&1`"; then
-  ac_cv_prog_cc_$1=yes
-else
-  ac_cv_prog_cc_$1=no
-fi
-rm -f conftest*
-])])
-
 dnl see if a declaration exists for a function or variable
 dnl defines HAVE_function_DECL if it exists
 dnl AC_HAVE_DECL(var, includes)
diff --git a/source3/compiler.m4 b/source3/compiler.m4
new file mode 100644
index 0000000000..32f87cbc78
--- /dev/null
+++ b/source3/compiler.m4
@@ -0,0 +1,990 @@
+dnl @synopsis AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
+dnl
+dnl AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
+dnl "checking CFLAGS for gcc -fvomit-frame ... yes" and adds
+dnl the optionflag to CFLAGS if it is understood. You can override
+dnl the shellvar-default of CFLAGS of course. The order of arguments
+dnl stems from the explicit macros like AX_CFLAGS_WARN_ALL.
+dnl
+dnl The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add
+dnl to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
+dnl (since it is possible to use different compilers for C and C++).
+dnl
+dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
+dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
+dnl However, if you use this macro in a few places, it would be great
+dnl if you would make up a new function-macro and submit it to the
+dnl ac-archive.
+dnl
+dnl   - $1 option-to-check-for : required ("-option" as non-value)
+dnl   - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
+dnl   - $3 action-if-found : add value to shellvariable
+dnl   - $4 action-if-not-found : nothing
+dnl
+dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
+dnl situation and accept a $2=~/-/ as being the old option-to-check-for.
+dnl
+dnl also: there are other variants that emerged from the original macro
+dnl variant which did just test an option to be possibly added. However,
+dnl some compilers accept an option silently, or possibly for just
+dnl another option that was not intended. Therefore, we have to do a
+dnl generic test for a compiler family. For gcc we check "-pedantic"
+dnl being accepted which is also understood by compilers who just want
+dnl to be compatible with gcc even when not being made from gcc sources.
+dnl
+dnl see also:
+dnl       AX_CFLAGS_SUN_OPTION               AX_CFLAGS_HPUX_OPTION
+dnl       AX_CFLAGS_AIX_OPTION               AX_CFLAGS_IRIX_OPTION
+dnl
+dnl @, tested, experimental
+dnl @version $Id: ax_cflags_gcc_option.m4,v 1.5 2003/11/29 08:13:25 guidod Exp $
+dnl @author Guido Draheim <guidod@gmx.de>
+dnl http://ac-archive.sourceforge.net/C_Support/ax_cflags_gcc_option.html
+dnl
+AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic  % m4_ifval($2,$2,-option)"  dnl   GCC
+   #
+do FLAGS="$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_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],[ac_cv_cxxflags_gcc_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic  % m4_ifval($2,$2,-option)"  dnl   GCC
+   #
+do FLAGS="$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_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],[ac_cv_cflags_gcc_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic  % m4_ifval($1,$1,-option)"  dnl   GCC
+   #
+do FLAGS="$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_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],[ac_cv_cxxflags_gcc_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic  % m4_ifval($1,$1,-option)"  dnl   GCC
+   #
+do FLAGS="$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_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($@)])])
+
+
+dnl @synopsis AX_CFLAGS_AIX_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
+dnl
+dnl AX_CFLAGS_AIX_OPTION(-qubicle) would show a message as like
+dnl "checking CFLAGS for aix/cc -qubicle ... yes" and adds
+dnl the optionflag to CFLAGS if it is understood. You can override
+dnl the shellvar-default of CFLAGS of course. The order of arguments
+dnl stems from the explicit macros like AX_CFLAGS_WARN_ALL.
+dnl
+dnl The cousin AX_CXXFLAGS_AIX_OPTION would check for an option to add
+dnl to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
+dnl (since it is possible to use different compilers for C and C++).
+dnl
+dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
+dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
+dnl However, if you use this macro in a few places, it would be great
+dnl if you would make up a new function-macro and submit it to the
+dnl ac-archive.
+dnl - $1 option-to-check-for : required ("-option" as non-value)
+dnl - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
+dnl - $3 action-if-found : add value to shellvariable
+dnl - $4 action-if-not-found : nothing
+dnl
+dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
+dnl situation and accept a $2=~/-/ as being the old option-to-check-for.
+dnl
+dnl see also: AX_CFLAGS_GCC_OPTION for the widely used original variant.
+dnl
+dnl @, untested, experimental
+dnl @version $Id: ax_cflags_aix_option.m4,v 1.1 2003/10/13 22:20:39 guidod Exp $
+dnl @author Guido Draheim <guidod@gmx.de>
+dnl http://ac-archive.sourceforge.net/guidod/ax_cflags_aix_option.m4
+dnl
+AC_DEFUN([AX_CFLAGS_AIX_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_aix_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for aix/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-qlanglvl=ansi -qsrcmsg % m4_ifval($2,$2,-option)"     dnl AIX
+   #
+do FLAGS="$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_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_AIX_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_aix_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for aix/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-qlanglvl=ansi -qsrcmsg % m4_ifval($2,$2,-option)"     dnl AIX
+   #
+do FLAGS="$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_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_AIX_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_aix_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for aix/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-qlanglvl=ansi -qsrcmsg % m4_ifval($1,$1,-option)"     dnl AIX
+   #
+do FLAGS="$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_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_AIX_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_aix_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for aix/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-qlanglvl=ansi -qsrcmsg % m4_ifval($1,$1,-option)"     dnl AIX
+   #
+do FLAGS="$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_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_AIX_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CFLAGS_AIX_OPTION_NEW($@)],[AX_CFLAGS_AIX_OPTION_OLD($@)])])
+
+AC_DEFUN([AX_CXXFLAGS_AIX_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CXXFLAGS_AIX_OPTION_NEW($@)],[AX_CXXFLAGS_AIX_OPTION_OLD($@)])])
+
+dnl @synopsis AX_CFLAGS_HPUX_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
+dnl
+dnl AX_CFLAGS_HPUX_OPTION(-Afresh) would show a message as like
+dnl "checking CFLAGS for hpux/cc -Afresh ... yes" and adds
+dnl the optionflag to CFLAGS if it is understood. You can override
+dnl the shellvar-default of CFLAGS of course. The order of arguments
+dnl stems from the explicit macros like AX_CFLAGS_WARN_ALL.
+dnl
+dnl The cousin AX_CXXFLAGS_HPUX_OPTION would check for an option to add
+dnl to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
+dnl (since it is possible to use different compilers for C and C++).
+dnl
+dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
+dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
+dnl However, if you use this macro in a few places, it would be great
+dnl if you would make up a new function-macro and submit it to the
+dnl ac-archive.
+dnl - $1 option-to-check-for : required ("-option" as non-value)
+dnl - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
+dnl - $3 action-if-found : add value to shellvariable
+dnl - $4 action-if-not-found : nothing
+dnl
+dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
+dnl situation and accept a $2=~/-/ as being the old option-to-check-for.
+dnl
+dnl see also: AX_CFLAGS_GCC_OPTION for the widely used original variant.
+dnl
+dnl @, untested, experimental
+dnl @version $Id: ax_cflags_hpux_option.m4,v 1.1 2003/10/13 22:20:39 guidod Exp $
+dnl @author Guido Draheim <guidod@gmx.de>
+dnl http://ac-archive.sourceforge.net/guidod/ax_cflags_hpux_option.m4
+AC_DEFUN([AX_CFLAGS_HPUX_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_hpux_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for hpux/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+ESlit +w1 -Aa % m4_ifval($2,$2,-option)"     dnl HP-UX C
+   #
+do FLAGS="$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_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_HPUX_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_hpux_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for hpux/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+ESlit +w1 -Aa % m4_ifval($2,$2,-option)"     dnl HP-UX C
+   #
+do FLAGS="$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_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_HPUX_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_hpux_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for hpux/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+ESlit +w1 -Aa % m4_ifval($1,$1,-option)"     dnl HP-UX C
+   #
+do FLAGS="$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_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_HPUX_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_hpux_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for hpux/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+ESlit +w1 -Aa % m4_ifval($1,$1,-option)"     dnl HP-UX C
+   #
+do FLAGS="$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_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_HPUX_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CFLAGS_HPUX_OPTION_NEW($@)],[AX_CFLAGS_HPUX_OPTION_OLD($@)])])
+
+AC_DEFUN([AX_CXXFLAGS_HPUX_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CXXFLAGS_HPUX_OPTION_NEW($@)],[AX_CXXFLAGS_HPUX_OPTION_OLD($@)])])
+
+
+dnl @synopsis AX_CFLAGS_IRIX_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
+dnl
+dnl AX_CFLAGS_IRIX_OPTION(-go_for_it) would show a message as like
+dnl "checking CFLAGS for irix/cc -go_for_it ... yes" and adds
+dnl the optionflag to CFLAGS if it is understood. You can override
+dnl the shellvar-default of CFLAGS of course. The order of arguments
+dnl stems from the explicit macros like AX_CFLAGS_WARN_ALL.
+dnl
+dnl The cousin AX_CXXFLAGS_IRIX_OPTION would check for an option to add
+dnl to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
+dnl (since it is possible to use different compilers for C and C++).
+dnl
+dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
+dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
+dnl However, if you use this macro in a few places, it would be great
+dnl if you would make up a new function-macro and submit it to the
+dnl ac-archive.
+dnl - $1 option-to-check-for : required ("-option" as non-value)
+dnl - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
+dnl - $3 action-if-found : add value to shellvariable
+dnl - $4 action-if-not-found : nothing
+dnl
+dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
+dnl situation and accept a $2=~/-/ as being the old option-to-check-for.
+dnl
+dnl see also: AX_CFLAGS_GCC_OPTION for the widely used original variant.
+dnl
+dnl @, untested, experimental
+dnl @version $Id: ax_cflags_irix_option.m4,v 1.1 2003/10/13 22:20:39 guidod Exp $
+dnl @author Guido Draheim <guidod@gmx.de>
+dnl http://ac-archive.sourceforge.net/guidod/ax_cflags_irix_option.m4
+AC_DEFUN([AX_CFLAGS_IRIX_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_irix_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for irix/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-fullwarn -use_readonly_const % m4_ifval($2,$2,-option)"     dnl IRIX C
+   #
+do FLAGS="$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_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_IRIX_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_irix_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for irix/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-fullwarn -use_readonly_const % m4_ifval($2,$2,-option)"     dnl IRIX C
+   #
+do FLAGS="$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_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_IRIX_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_irix_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for irix/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-fullwarn -use_readonly_const % m4_ifval($1,$1,-option)"     dnl IRIX C
+   #
+do FLAGS="$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_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_IRIX_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_irix_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for irix/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-fullwarn -use_readonly_const % m4_ifval($1,$1,-option)"     dnl IRIX C
+   #
+do FLAGS="$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_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_IRIX_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CFLAGS_IRIX_OPTION_NEW($@)],[AX_CFLAGS_IRIX_OPTION_OLD($@)])])
+
+AC_DEFUN([AX_CXXFLAGS_IRIX_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CXXFLAGS_IRIX_OPTION_NEW($@)],[AX_CXXFLAGS_IRIX_OPTION_OLD($@)])])
+
+
+dnl @synopsis AX_CFLAGS_SUN_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
+dnl
+dnl AX_CFLAGS_SUN_OPTION(+xtreme) would show a message as like
+dnl "checking CFLAGS for sun/cc +xtreme ... yes" and adds
+dnl the optionflag to CFLAGS if it is understood. You can override
+dnl the shellvar-default of CFLAGS of course. The order of arguments
+dnl stems from the explicit macros like AX_CFLAGS_WARN_ALL.
+dnl
+dnl The cousin AX_CXXFLAGS_SUN_OPTION would check for an option to add
+dnl to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
+dnl (since it is possible to use different compilers for C and C++).
+dnl
+dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
+dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
+dnl However, if you use this macro in a few places, it would be great
+dnl if you would make up a new function-macro and submit it to the
+dnl ac-archive.
+dnl - $1 option-to-check-for : required ("-option" as non-value)
+dnl - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
+dnl - $3 action-if-found : add value to shellvariable
+dnl - $4 action-if-not-found : nothing
+dnl
+dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
+dnl situation and accept a $2=~/-/ as being the old option-to-check-for.
+dnl
+dnl see also: AX_CFLAGS_GCC_OPTION for the widely used original variant.
+dnl
+dnl @, untested, experimental
+dnl @version $Id: ax_cflags_sun_option.m4,v 1.1 2003/10/13 22:20:39 guidod Exp $
+dnl @author Guido Draheim <guidod@gmx.de>
+dnl http://ac-archive.sourceforge.net/guidod/ax_cflags_sun_option.m4
+AC_DEFUN([AX_CFLAGS_SUN_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_sun_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for sun/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+xstrconst -Xc % m4_ifval($2,$2,-option)"     dnl Solaris C
+   #
+do FLAGS="$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_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_SUN_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_sun_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for sun/cc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+xstrconst -Xc % m4_ifval($2,$2,-option)"     dnl Solaris C
+   #
+do FLAGS="$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_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_SUN_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_sun_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for sun/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+xstrconst -Xc % m4_ifval($1,$1,-option)"     dnl Solaris C
+   #
+do FLAGS="$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_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_SUN_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_sun_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for sun/cc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "+xstrconst -Xc % m4_ifval($1,$1,-option)"     dnl Solaris C
+   #
+do FLAGS="$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_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_SUN_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CFLAGS_SUN_OPTION_NEW($@)],[AX_CFLAGS_SUN_OPTION_OLD($@)])])
+
+AC_DEFUN([AX_CXXFLAGS_SUN_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CXXFLAGS_SUN_OPTION_NEW($@)],[AX_CXXFLAGS_SUN_OPTION_OLD($@)])])
+
+
+dnl @synopsis AX_CFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
+dnl
+dnl Try to find a compiler option that enables most reasonable warnings.
+dnl This macro is directly derived from VL_PROG_CC_WARNINGS which is
+dnl split up into two AX_CFLAGS_WARN_ALL and AX_CFLAGS_WARN_ALL_ANSI
+dnl
+dnl For the GNU CC compiler it will be -Wall (and -ansi -pedantic)
+dnl The result is added to the shellvar being CFLAGS by default.
+dnl
+dnl Currently this macro knows about GCC, Solaris C compiler,
+dnl Digital Unix C compiler, C for AIX Compiler, HP-UX C compiler,
+dnl IRIX C compiler, NEC SX-5 (Super-UX 10) C compiler, and Cray J90
+dnl (Unicos 10.0.0.8) C compiler.
+dnl
+dnl - $1 shell-variable-to-add-to : CFLAGS
+dnl - $2 add-value-if-not-found : nothing
+dnl - $3 action-if-found : add value to shellvariable
+dnl - $4 action-if-not-found : nothing
+dnl
+dnl @version $Id: ax_cflags_warn_all.m4,v 1.2 2003/10/12 14:56:07 guidod Exp $
+dnl @author Guido Draheim <guidod@gmx.de>
+dnl http://ac-archive.sourceforge.net/guidod/ax_cflags_warn_all.m4
+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,$1,FLAGS) for maximum warnings],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CXX
+ ac_save_[]FLAGS="$[]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.
+
diff --git a/source3/configure.in b/source3/configure.in
index 2c969a9c41..82eb097716 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -5,9 +5,6 @@ AC_PREREQ(2.53)
 AC_INIT(include/includes.h)
 AC_CONFIG_HEADER(include/config.h)
 
-AC_DISABLE_STATIC
-AC_ENABLE_SHARED
-
 SMB_VERSION_STRING=`cat $srcdir/include/version.h | grep 'SAMBA_VERSION_OFFICIAL_STRING' | cut -d '"' -f2`
 echo "SAMBA VERSION: ${SMB_VERSION_STRING}"
 
@@ -16,6 +13,31 @@ if test -n "${SAMBA_VERSION_SVN_REVISION}";then
 	echo "BUILD REVISION: ${SAMBA_VERSION_SVN_REVISION}"
 fi
 
+#################################################
+# Detect the compiler early so we know how to run
+# feature tests correctly.
+
+sinclude(compiler.m4)
+
+##
+## for some reason this macro resets the CFLAGS
+## so save and restore
+##
+OLD_CFLAGS=${CFLAGS}
+AC_PROG_CC
+CFLAGS=${OLD_CFLAGS}
+
+OLD_CFLAGS=${CFLAGS}
+AC_PROG_CPP
+CFLAGS=${OLD_CFLAGS}
+
+dnl Check if we use GNU ld
+LD=${LD-ld}
+AC_PROG_LD_GNU
+
+AC_DISABLE_STATIC
+AC_ENABLE_SHARED
+
 #################################################
 # Directory handling stuff to support both the
 # legacy SAMBA directories and FHS compliant
@@ -290,34 +312,34 @@ if test "x$CFLAGS" = x; then
   CFLAGS="-O"
 fi
 
-CFLAGS="${CFLAGS} -D_SAMBA_BUILD_"
+CPPFLAGS="${CPPFLAGS} -D_SAMBA_BUILD_"
 
 AC_ARG_ENABLE(developer, [  --enable-developer      Turn on developer warnings and debugging (default=no)],
     [if eval "test x$enable_developer = xyes"; then
         developer=yes
-    	CFLAGS="${CFLAGS} -gstabs -Wall -Wshadow -Wstrict-prototypes -Wpointer-arith -Wcast-align -Wwrite-strings -DDEBUG_PASSWORD -DDEVELOPER"
-	# Add -Wdeclaration-after-statement if compiler supports it
-	AC_CACHE_CHECK(
-          [that the C compiler understands -Wdeclaration-after-statement],
-          samba_cv_HAVE_Wdeclaration_after_statement, [
-	  AC_TRY_RUN_STRICT([
-	    int main(void)
-	    {
-	    	return 0;
-	    }],[-Wdeclaration-after-statement],[$CPPFLAGS],[$LDFLAGS],
-	    samba_cv_HAVE_Wdeclaration_after_statement=yes,
-	    samba_cv_HAVE_Wdeclaration_after_statement=no,
-	    samba_cv_HAVE_Wdeclaration_after_statement=cross)
-       ])
-       if test x"$samba_cv_HAVE_Wdeclaration_after_statement" = x"yes"; then
-	    CFLAGS="${CFLAGS} -Wdeclaration-after-statement"
-       fi
+	AX_CFLAGS_WARN_ALL(CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-gstabs, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wshadow, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wstrict-prototypes, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wpointer-arith, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wcast-align, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wwrite-strings, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wdeclaration-after-statement, CFLAGS)
+    	CPPFLAGS="${CPPFLAGS} -DDEBUG_PASSWORD -DDEVELOPER"
     fi])
 
 AC_ARG_ENABLE(krb5developer, [  --enable-krb5developer  Turn on developer warnings and debugging, except -Wstrict-prototypes (default=no)],
     [if eval "test x$enable_krb5developer = xyes"; then
         developer=yes
-	CFLAGS="${CFLAGS} -gstabs -Wall -Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings -DDEBUG_PASSWORD -DDEVELOPER"
+	AX_CFLAGS_WARN_ALL(CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-gstabs, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wshadow, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wpointer-arith, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wcast-align, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wcast-qual, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wwrite-strings, CFLAGS)
+	AX_CFLAGS_GCC_OPTION(-Wdeclaration-after-statement, CFLAGS)
+    	CPPFLAGS="${CPPFLAGS} -DDEBUG_PASSWORD -DDEVELOPER"
     fi])
 
 AC_ARG_ENABLE(dmalloc, [  --enable-dmalloc        Enable heap debugging [default=no]])
@@ -332,28 +354,12 @@ fi
 
 dnl Checks for programs.
 
-##
-## for some reason this macro resets the CFLAGS
-## so save and restore
-##
-OLD_CFLAGS=${CFLAGS}
-AC_PROG_CC
-CFLAGS=${OLD_CFLAGS}
-
-OLD_CFLAGS=${CFLAGS}
-AC_PROG_CPP
-CFLAGS=${OLD_CFLAGS}
-
 AC_PROG_INSTALL
 AC_PROG_AWK
 AC_PATH_PROG(PERL, perl)
 
 AC_CHECK_TOOL(AR, ar)
 
-dnl Check if we use GNU ld
-LD=ld
-AC_PROG_LD_GNU
-
 dnl Certain versions of GNU ld the default is not to have the 
 dnl --allow-shlib-undefined flag defined.  This causes a stackload of
 dnl warnings when building modules.
@@ -402,28 +408,10 @@ fi
 AC_SUBST(BROKEN_CC)
 
 dnl Check if the C compiler understands -Werror
-AC_CACHE_CHECK([that the C compiler understands -Werror],samba_cv_HAVE_Werror, [
- AC_TRY_RUN_STRICT([
-  int main(void)
-  {
-  	return 0;
-  }],[-Werror],[$CPPFLAGS],[$LDFLAGS],
-  samba_cv_HAVE_Werror=yes,samba_cv_HAVE_Werror=no,samba_cv_HAVE_Werror=cross)])
-if test x"$samba_cv_HAVE_Werror" = x"yes"; then
-   Werror_FLAGS="-Werror"
-else 
+AX_CFLAGS_GCC_OPTION(-Werror, Werror_FLAGS)
+
 dnl Check if the C compiler understands -w2
-AC_CACHE_CHECK([that the C compiler understands -w2],samba_cv_HAVE_w2, [
- AC_TRY_RUN_STRICT([
-  int main(void)
-  {
-  	return 0;
-  }],[-w2],[$CPPFLAGS],[$LDFLAGS],
-  samba_cv_HAVE_w2=yes,samba_cv_HAVE_w2=no,samba_cv_HAVE_w2=cross)])
-if test x"$samba_cv_HAVE_w2" = x"yes"; then
-   Werror_FLAGS="-w2"
-fi
-fi
+AX_CFLAGS_IRIX_OPTION(-w2, Werror_FLAGS)
 
 dnl Check if the C compiler understands volatile (it should, being ANSI).
 AC_CACHE_CHECK([that the C compiler understands volatile],samba_cv_volatile, [
@@ -482,12 +470,11 @@ case "$host_os" in
 # Try to work out if this is the native HPUX compiler that uses the -Ae flag.
     *hpux*)
     
-      AC_PROG_CC_FLAG(Ae)
+      AX_CFLAGS_HPUX_OPTION(Ae, CFLAGS,
+	      [ac_cv_prog_cc_Ae=yes], [ac_cv_prog_cc_Ae=no])
       # mmap on HPUX is completely broken...
       AC_DEFINE(MMAP_BLACKLIST, 1, [Whether MMAP is broken])
-      if test $ac_cv_prog_cc_Ae = yes; then
-        CPPFLAGS="$CPPFLAGS -Ae"
-      fi
+
 #
 # Defines needed for HPUX support.
 # HPUX has bigcrypt but (sometimes?) doesn't use it for
-- 
cgit