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    1 # ===========================================================================
    2 #           http://autoconf-archive.cryp.to/ax_prefix_config_h.html
    3 # ===========================================================================
    4 #
    5 # SYNOPSIS
    6 #
    7 #   AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
    8 #
    9 # DESCRIPTION
   10 #
   11 #   This is a new variant from ac_prefix_config_ this one will use a
   12 #   lowercase-prefix if the config-define was starting with a
   13 #   lowercase-char, e.g. "#define const", "#define restrict", or "#define
   14 #   off_t", (and this one can live in another directory, e.g.
   15 #   testpkg/config.h therefore I decided to move the output-header to be the
   16 #   first arg)
   17 #
   18 #   takes the usual config.h generated header file; looks for each of the
   19 #   generated "#define SOMEDEF" lines, and prefixes the defined name (ie.
   20 #   makes it "#define PREFIX_SOMEDEF". The result is written to the output
   21 #   config.header file. The PREFIX is converted to uppercase for the
   22 #   conversions.
   23 #
   24 #   Defaults:
   25 #
   26 #     OUTPUT-HEADER = $PACKAGE-config.h
   27 #     PREFIX = $PACKAGE
   28 #     ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
   29 #
   30 #   Your configure.ac script should contain both macros in this order, and
   31 #   unlike the earlier variations of this prefix-macro it is okay to place
   32 #   the AX_PREFIX_CONFIG_H call before the AC_OUTPUT invokation.
   33 #
   34 #   Example:
   35 #
   36 #     AC_INIT(config.h.in)        # config.h.in as created by "autoheader"
   37 #     AM_INIT_AUTOMAKE(testpkg, 0.1.1)    # makes #undef VERSION and PACKAGE
   38 #     AM_CONFIG_HEADER(config.h)          # prep config.h from config.h.in
   39 #     AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
   40 #     AC_MEMORY_H                         # makes "#undef NEED_MEMORY_H"
   41 #     AC_C_CONST_H                        # makes "#undef const"
   42 #     AC_OUTPUT(Makefile)                 # creates the "config.h" now
   43 #                                         # and also mylib/_config.h
   44 #
   45 #   if the argument to AX_PREFIX_CONFIG_H would have been omitted then the
   46 #   default outputfile would have been called simply "testpkg-config.h", but
   47 #   even under the name "mylib/_config.h" it contains prefix-defines like
   48 #
   49 #     #ifndef TESTPKG_VERSION
   50 #     #define TESTPKG_VERSION "0.1.1"
   51 #     #endif
   52 #     #ifndef TESTPKG_NEED_MEMORY_H
   53 #     #define TESTPKG_NEED_MEMORY_H 1
   54 #     #endif
   55 #     #ifndef _testpkg_const
   56 #     #define _testpkg_const _const
   57 #     #endif
   58 #
   59 #   and this "mylib/_config.h" can be installed along with other
   60 #   header-files, which is most convenient when creating a shared library
   61 #   (that has some headers) where some functionality is dependent on the
   62 #   OS-features detected at compile-time. No need to invent some
   63 #   "mylib-confdefs.h.in" manually. :-)
   64 #
   65 #   Note that some AC_DEFINEs that end up in the config.h file are actually
   66 #   self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T
   67 #   say that they "will define inline|const|off_t if the system does not do
   68 #   it by itself". You might want to clean up about these - consider an
   69 #   extra mylib/conf.h that reads something like:
   70 #
   71 #      #include <mylib/_config.h>
   72 #      #ifndef _testpkg_const
   73 #      #define _testpkg_const const
   74 #      #endif
   75 #
   76 #   and then start using _testpkg_const in the header files. That is also a
   77 #   good thing to differentiate whether some library-user has starting to
   78 #   take up with a different compiler, so perhaps it could read something
   79 #   like this:
   80 #
   81 #     #ifdef _MSC_VER
   82 #     #include <mylib/_msvc.h>
   83 #     #else
   84 #     #include <mylib/_config.h>
   85 #     #endif
   86 #     #ifndef _testpkg_const
   87 #     #define _testpkg_const const
   88 #     #endif
   89 #
   90 # LAST MODIFICATION
   91 #
   92 #   2008-04-12
   93 #
   94 # COPYLEFT
   95 #
   96 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
   97 #   Copyright (c) 2008 Marten Svantesson
   98 #   Copyright (c) 2008 Gerald Point <Gerald.Point@labri.fr>
   99 #
  100 #   This program is free software; you can redistribute it and/or modify it
  101 #   under the terms of the GNU General Public License as published by the
  102 #   Free Software Foundation; either version 2 of the License, or (at your
  103 #   option) any later version.
  104 #
  105 #   This program is distributed in the hope that it will be useful, but
  106 #   WITHOUT ANY WARRANTY; without even the implied warranty of
  107 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  108 #   Public License for more details.
  109 #
  110 #   You should have received a copy of the GNU General Public License along
  111 #   with this program. If not, see <http://www.gnu.org/licenses/>.
  112 #
  113 #   As a special exception, the respective Autoconf Macro's copyright owner
  114 #   gives unlimited permission to copy, distribute and modify the configure
  115 #   scripts that are the output of Autoconf when processing the Macro. You
  116 #   need not follow the terms of the GNU General Public License when using
  117 #   or distributing such scripts, even though portions of the text of the
  118 #   Macro appear in them. The GNU General Public License (GPL) does govern
  119 #   all other use of the material that constitutes the Autoconf Macro.
  120 #
  121 #   This special exception to the GPL applies to versions of the Autoconf
  122 #   Macro released by the Autoconf Macro Archive. When you make and
  123 #   distribute a modified version of the Autoconf Macro, you may extend this
  124 #   special exception to the GPL to apply to your modified version as well.
  125 
  126 AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
  127 AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl
  128 AC_CONFIG_COMMANDS([ifelse($1,,$PACKAGE-config.h,$1)],[dnl
  129 AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
  130 AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
  131 AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
  132 AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
  133 AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
  134 AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
  135 m4_pushdef([_script],[conftest.prefix])dnl
  136 m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl
  137 _OUT=`echo ifelse($1, , $PACKAGE-config.h, $1)`
  138 _DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
  139 _PKG=`echo ifelse($2, , $PACKAGE, $2)`
  140 _LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"`
  141 _UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:"  -e "/^@<:@m4_cr_digits@:>@/s/^/_/"`
  142 _INP=`echo "ifelse($3,,,$3)" | sed -e 's/ *//'`
  143 if test ".$_INP" = "."; then
  144    for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue
  145      case "$ac_file" in
  146         *.h) _INP=$ac_file ;;
  147         *)
  148      esac
  149      test ".$_INP" != "." && break
  150    done
  151 fi
  152 if test ".$_INP" = "."; then
  153    case "$_OUT" in
  154       */*) _INP=`basename "$_OUT"`
  155       ;;
  156       *-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
  157       ;;
  158       *) _INP=config.h
  159       ;;
  160    esac
  161 fi
  162 if test -z "$_PKG" ; then
  163    AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
  164 else
  165   if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
  166      _INP="$srcdir/$_INP"
  167   fi fi
  168   AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines)
  169   # ANL modification: the original version of the following "echo" commands
  170   # caused problems under dash because its echo interprets an arg of |\1| as an
  171   # a request to print the character with a numeric value of 0x01, or ^A.
  172   # Switching to AS_ECHO fixes the problem for both dash and other shells.
  173   if test -f $_INP ; then
  174     AS_ECHO("s/^@%:@undef  *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/") > _script
  175     AS_ECHO("s/^@%:@undef  *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/") >> _script
  176     AS_ECHO("s/^@%:@def[]ine  *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1 \\") >> _script
  177     AS_ECHO("@%:@def[]ine $_UPP""_\\1 \\2 \\") >> _script
  178     AS_ECHO("@%:@endif/") >>_script
  179     AS_ECHO("s/^@%:@def[]ine  *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1 \\") >> _script
  180     AS_ECHO("@%:@define $_LOW""_\\1 \\2 \\") >> _script
  181     AS_ECHO("@%:@endif/") >> _script
  182     # now executing _script on _DEF input to create _OUT output file
  183     AS_ECHO("@%:@ifndef $_DEF")      >$tmp/pconfig.h
  184     AS_ECHO("@%:@def[]ine $_DEF 1") >>$tmp/pconfig.h
  185     AS_ECHO(' ') >>$tmp/pconfig.h
  186     AS_ECHO("/* $_OUT. Generated automatically at end of configure. */") >>$tmp/pconfig.h
  187 
  188     sed -f _script $_INP >>$tmp/pconfig.h
  189     echo ' ' >>$tmp/pconfig.h
  190     echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h
  191     echo "@%:@endif" >>$tmp/pconfig.h
  192     if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
  193       AC_MSG_NOTICE([$_OUT is unchanged])
  194     else
  195       ac_dir=`AS_DIRNAME(["$_OUT"])`
  196       AS_MKDIR_P(["$ac_dir"])
  197       rm -f "$_OUT"
  198       mv $tmp/pconfig.h "$_OUT"
  199     fi
  200     cp _script _configs.sed
  201   else
  202     AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
  203   fi
  204   rm -f conftest.*
  205 fi
  206 m4_popdef([_symbol])dnl
  207 m4_popdef([_script])dnl
  208 AS_VAR_POPDEF([_INP])dnl
  209 AS_VAR_POPDEF([_UPP])dnl
  210 AS_VAR_POPDEF([_LOW])dnl
  211 AS_VAR_POPDEF([_PKG])dnl
  212 AS_VAR_POPDEF([_DEF])dnl
  213 AS_VAR_POPDEF([_OUT])dnl
  214 ],[PACKAGE="$PACKAGE"])])
  215 
  216 dnl implementation note: a bug report (31.5.2005) from Marten Svantesson points
  217 dnl out a problem where `echo "\1"` results in a Control-A. The unix standard
  218 dnl    http://www.opengroup.org/onlinepubs/000095399/utilities/echo.html
  219 dnl defines all backslash-sequences to be inherently non-portable asking
  220 dnl for replacement mit printf. Some old systems had problems with that
  221 dnl one either. However, the latest libtool (!) release does export an $ECHO
  222 dnl (and $echo) that does the right thing - just one question is left: what
  223 dnl was the first version to have it? Is it greater 2.58 ?