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
126AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
127AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl
128AC_CONFIG_COMMANDS([ifelse($1,,$PACKAGE-config.h,$1)],[dnl
129AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
130AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
131AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
132AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
133AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
134AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
135m4_pushdef([_script],[conftest.prefix])dnl
136m4_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,,,$3)" | sed -e 's/ *//'`
143if test ".$_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 ".$_INP" != "." && break
150   done
151fi
152if test ".$_INP" = "."; then
153   case "$_OUT" in
154      */*) _INP=`basename "$_OUT"`
155      ;;
156      *-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
157      ;;
158      *) _INP=config.h
159      ;;
160   esac
161fi
162if test -z "$_PKG" ; then
163   AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
164else
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  if test -f $_INP ; then
170    echo "s/^@%:@undef  *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/" > _script
171    echo "s/^@%:@undef  *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/" >> _script
172    echo "s/^@%:@def[]ine  *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1 \\" >> _script
173    echo "@%:@def[]ine $_UPP""_\\1 \\2 \\" >> _script
174    echo "@%:@endif/" >>_script
175    echo "s/^@%:@def[]ine  *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1 \\" >> _script
176    echo "@%:@define $_LOW""_\\1 \\2 \\" >> _script
177    echo "@%:@endif/" >> _script
178    # now executing _script on _DEF input to create _OUT output file
179    echo "@%:@ifndef $_DEF"      >$tmp/pconfig.h
180    echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h
181    echo ' ' >>$tmp/pconfig.h
182    echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h
183
184    sed -f _script $_INP >>$tmp/pconfig.h
185    echo ' ' >>$tmp/pconfig.h
186    echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h
187    echo "@%:@endif" >>$tmp/pconfig.h
188    if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
189      AC_MSG_NOTICE([$_OUT is unchanged])
190    else
191      ac_dir=`AS_DIRNAME(["$_OUT"])`
192      AS_MKDIR_P(["$ac_dir"])
193      rm -f "$_OUT"
194      mv $tmp/pconfig.h "$_OUT"
195    fi
196    cp _script _configs.sed
197  else
198    AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
199  fi
200  rm -f conftest.*
201fi
202m4_popdef([_symbol])dnl
203m4_popdef([_script])dnl
204AS_VAR_POPDEF([_INP])dnl
205AS_VAR_POPDEF([_UPP])dnl
206AS_VAR_POPDEF([_LOW])dnl
207AS_VAR_POPDEF([_PKG])dnl
208AS_VAR_POPDEF([_DEF])dnl
209AS_VAR_POPDEF([_OUT])dnl
210],[PACKAGE="$PACKAGE"])])
211
212dnl implementation note: a bug report (31.5.2005) from Marten Svantesson points
213dnl out a problem where `echo "\1"` results in a Control-A. The unix standard
214dnl    http://www.opengroup.org/onlinepubs/000095399/utilities/echo.html
215dnl defines all backslash-sequences to be inherently non-portable asking
216dnl for replacement mit printf. Some old systems had problems with that
217dnl one either. However, the latest libtool (!) release does export an $ECHO
218dnl (and $echo) that does the right thing - just one question is left: what
219dnl was the first version to have it? Is it greater 2.58 ?
220