| blob | 70dee8fb4eca963fc564ae1fd59d445d03daf97f |
1 dnl @synopsis AX_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
2 dnl
3 dnl This is a new variant from ac_prefix_config_ this one will use a
4 dnl lowercase-prefix if the config-define was starting with a
5 dnl lowercase-char, e.g. "#define const", "#define restrict", or
6 dnl "#define off_t", (and this one can live in another directory, e.g.
7 dnl testpkg/config.h therefore I decided to move the output-header to
8 dnl be the first arg)
9 dnl
10 dnl takes the usual config.h generated header file; looks for each of
11 dnl the generated "#define SOMEDEF" lines, and prefixes the defined
12 dnl name (ie. makes it "#define PREFIX_SOMEDEF". The result is written
13 dnl to the output config.header file. The PREFIX is converted to
14 dnl uppercase for the conversions.
15 dnl
16 dnl Defaults:
17 dnl
18 dnl OUTPUT-HEADER = $PACKAGE-config.h
19 dnl PREFIX = $PACKAGE
20 dnl ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
21 dnl
22 dnl Your configure.ac script should contain both macros in this order,
23 dnl and unlike the earlier variations of this prefix-macro it is okay
24 dnl to place the AX_PREFIX_CONFIG_H call before the AC_OUTPUT
25 dnl invokation.
26 dnl
27 dnl Example:
28 dnl
29 dnl AC_INIT(config.h.in) # config.h.in as created by "autoheader"
30 dnl AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE
31 dnl AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in
32 dnl AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
33 dnl AC_MEMORY_H # makes "#undef NEED_MEMORY_H"
34 dnl AC_C_CONST_H # makes "#undef const"
35 dnl AC_OUTPUT(Makefile) # creates the "config.h" now
36 dnl # and also mylib/_config.h
37 dnl
38 dnl if the argument to AX_PREFIX_CONFIG_H would have been omitted then
39 dnl the default outputfile would have been called simply
40 dnl "testpkg-config.h", but even under the name "mylib/_config.h" it
41 dnl contains prefix-defines like
42 dnl
43 dnl #ifndef TESTPKG_VERSION
44 dnl #define TESTPKG_VERSION "0.1.1"
45 dnl #endif
46 dnl #ifndef TESTPKG_NEED_MEMORY_H
47 dnl #define TESTPKG_NEED_MEMORY_H 1
48 dnl #endif
49 dnl #ifndef _testpkg_const
50 dnl #define _testpkg_const _const
51 dnl #endif
52 dnl
53 dnl and this "mylib/_config.h" can be installed along with other
54 dnl header-files, which is most convenient when creating a shared
55 dnl library (that has some headers) where some functionality is
56 dnl dependent on the OS-features detected at compile-time. No need to
57 dnl invent some "mylib-confdefs.h.in" manually. :-)
58 dnl
59 dnl Note that some AC_DEFINEs that end up in the config.h file are
60 dnl actually self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the
61 dnl AC_TYPE_OFF_T say that they "will define inline|const|off_t if the
62 dnl system does not do it by itself". You might want to clean up about
63 dnl these - consider an extra mylib/conf.h that reads something like:
64 dnl
65 dnl #include <mylib/_config.h>
66 dnl #ifndef _testpkg_const
67 dnl #define _testpkg_const const
68 dnl #endif
69 dnl
70 dnl and then start using _testpkg_const in the header files. That is
71 dnl also a good thing to differentiate whether some library-user has
72 dnl starting to take up with a different compiler, so perhaps it could
73 dnl read something like this:
74 dnl
75 dnl #ifdef _MSC_VER
76 dnl #include <mylib/_msvc.h>
77 dnl #else
78 dnl #include <mylib/_config.h>
79 dnl #endif
80 dnl #ifndef _testpkg_const
81 dnl #define _testpkg_const const
82 dnl #endif
83 dnl
84 dnl @category Misc
85 dnl @author Guido U. Draheim <guidod@gmx.de>
86 dnl @version 2003-07-03
87 dnl @license GPLWithACException
88 AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
89 AC_PROVIDE_IFELSE([AC_CONFIG_HEADERS], dnl
90 ,[warning if no AC_CONFIG_HEADERS precedes $ ])dnl
91 AC_CONFIG_COMMANDS([ifelse($1,,$PACKAGE-config.h,$1)],[dnl
92 AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
93 AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
94 AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
95 AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
96 AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
97 AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
98 m4_pushdef([_script],[conftest.prefix])dnl
99 m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl
100 _OUT=`echo ifelse($1, , $PACKAGE-config.h, $1)`
101 _DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
102 _PKG=`echo ifelse($2, , $PACKAGE, $2)`
103 _LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"`
104 _UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"`
105 _INP=`echo "ifelse($3,,,$3)" | sed -e 's/ *//'`
106 if test ".$_INP" = "."; then
107 for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue
108 case "$ac_file" in
109 *.h) _INP=$ac_file ;;
110 *)
111 esac
112 test ".$_INP" != "." && break
113 done
114 fi
115 if test ".$_INP" = "."; then
116 case "$_OUT" in
117 */*) _INP=`basename "$_OUT"`
118 ;;
119 *-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
120 ;;
121 *) _INP=config.h
122 ;;
123 esac
124 fi
125 if test -z "$_PKG" ; then
126 AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
127 else
128 if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
129 _INP="$srcdir/$_INP"
130 fi fi
131 AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines)
132 if test -f $_INP ; then
133 echo "s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/" > _script
134 echo "s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/" >> _script
135 echo "s/^@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1 \\" >> _script
136 echo "@%:@def[]ine $_UPP""_\\1 \\2 \\" >> _script
137 echo "@%:@endif/" >>_script
138 echo "s/^@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1 \\" >> _script
139 echo "@%:@define $_LOW""_\\1 \\2 \\" >> _script
140 echo "@%:@endif/" >> _script
141 # now executing _script on _DEF input to create _OUT output file
142 echo "@%:@ifndef $_DEF" >$tmp/pconfig.h
143 echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h
144 echo ' ' >>$tmp/pconfig.h
145 echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h
147 sed -f _script $_INP >>$tmp/pconfig.h
148 echo ' ' >>$tmp/pconfig.h
149 echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h
150 echo "@%:@endif" >>$tmp/pconfig.h
151 if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
152 AC_MSG_NOTICE([$_OUT is unchanged])
153 else
154 ac_dir=`AS_DIRNAME(["$_OUT"])`
155 AS_MKDIR_P(["$ac_dir"])
156 rm -f "$_OUT"
157 mv $tmp/pconfig.h "$_OUT"
158 fi
159 cp _script _configs.sed
160 else
161 AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
162 fi
163 rm -f conftest.*
164 fi
165 m4_popdef([_symbol])dnl
166 m4_popdef([_script])dnl
167 AS_VAR_POPDEF([_INP])dnl
168 AS_VAR_POPDEF([_UPP])dnl
169 AS_VAR_POPDEF([_LOW])dnl
170 AS_VAR_POPDEF([_PKG])dnl
171 AS_VAR_POPDEF([_DEF])dnl
172 AS_VAR_POPDEF([_OUT])dnl
173 ],[PACKAGE="$PACKAGE"])])
175 dnl implementation note: a bug report (31.5.2005) from Marten Svantesson points
176 dnl out a problem where `echo "\1"` results in a Control-A. The unix standard
177 dnl http://www.opengroup.org/onlinepubs/000095399/utilities/echo.html
178 dnl defines all backslash-sequences to be inherently non-portable asking
179 dnl for replacement mit printf. Some old systems had problems with that
180 dnl one either. However, the latest libtool (!) release does export an $ECHO
181 dnl (and $echo) that does the right thing - just one question is left: what
182 dnl was the first version to have it? Is it greater 2.58 ?