Collection of DPF-based plugins for packaging
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  1. # ===========================================================================
  2. # https://www.gnu.org/software/autoconf-archive/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. # Generate an installable config.h.
  12. #
  13. # A package should not normally install its config.h as a system header,
  14. # but if it must, this macro can be used to avoid namespace pollution by
  15. # making a copy of config.h with a prefix added to all the macro names.
  16. #
  17. # Each "#define SOMEDEF" line of the configuration header has the given
  18. # prefix added, in the same case as the first character of the macro name.
  19. #
  20. # Defaults:
  21. #
  22. # OUTPUT-HEADER = $PACKAGE-config.h
  23. # PREFIX = $PACKAGE
  24. # ORIG-HEADER, from AM_CONFIG_HEADER(config.h)
  25. #
  26. # Your configure.ac script should contain both macros in this order.
  27. #
  28. # Example:
  29. #
  30. # AC_INIT(config.h.in) # config.h.in as created by "autoheader"
  31. # AM_INIT_AUTOMAKE(testpkg, 0.1.1) # makes #undef VERSION and PACKAGE
  32. # AM_CONFIG_HEADER(config.h) # prep config.h from config.h.in
  33. # AX_PREFIX_CONFIG_H(mylib/_config.h) # prep mylib/_config.h from it..
  34. # AC_MEMORY_H # makes "#undef NEED_MEMORY_H"
  35. # AC_C_CONST_H # makes "#undef const"
  36. # AC_OUTPUT(Makefile) # creates the "config.h" now
  37. # # and also mylib/_config.h
  38. #
  39. # If the argument to AX_PREFIX_CONFIG_H would have been omitted then the
  40. # default output file would have been called simply "testpkg-config.h",
  41. # but even under the name "mylib/_config.h" it contains prefix-defines
  42. # like
  43. #
  44. # #ifndef TESTPKG_VERSION
  45. # #define TESTPKG_VERSION "0.1.1"
  46. # #endif
  47. # #ifndef TESTPKG_NEED_MEMORY_H
  48. # #define TESTPKG_NEED_MEMORY_H 1
  49. # #endif
  50. # #ifndef _testpkg_const
  51. # #define _testpkg_const _const
  52. # #endif
  53. #
  54. # and this "mylib/_config.h" can be installed along with other header
  55. # files, which is most convenient when creating a shared library (that has
  56. # some headers) whose functionality depends on features detected at
  57. # compile-time. No need to invent some "mylib-confdefs.h.in" manually.
  58. #
  59. # Note that some AC_DEFINEs that end up in the config.h file are actually
  60. # self-referential - e.g. AC_C_INLINE, AC_C_CONST, and the AC_TYPE_OFF_T
  61. # say that they "will define inline|const|off_t if the system does not do
  62. # it by itself". You might want to clean up about these - consider an
  63. # extra mylib/conf.h that reads something like:
  64. #
  65. # #include <mylib/_config.h>
  66. # #ifndef _testpkg_const
  67. # #define _testpkg_const const
  68. # #endif
  69. #
  70. # and then start using _testpkg_const in the header files. That is also a
  71. # good thing to differentiate whether some library-user has starting to
  72. # take up with a different compiler, so perhaps it could read something
  73. # like this:
  74. #
  75. # #ifdef _MSC_VER
  76. # #include <mylib/_msvc.h>
  77. # #else
  78. # #include <mylib/_config.h>
  79. # #endif
  80. # #ifndef _testpkg_const
  81. # #define _testpkg_const const
  82. # #endif
  83. #
  84. # LICENSE
  85. #
  86. # Copyright (c) 2014 Reuben Thomas <rrt@sc3d.org>
  87. # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
  88. # Copyright (c) 2008 Marten Svantesson
  89. # Copyright (c) 2008 Gerald Point <Gerald.Point@labri.fr>
  90. #
  91. # This program is free software; you can redistribute it and/or modify it
  92. # under the terms of the GNU General Public License as published by the
  93. # Free Software Foundation; either version 3 of the License, or (at your
  94. # option) any later version.
  95. #
  96. # This program is distributed in the hope that it will be useful, but
  97. # WITHOUT ANY WARRANTY; without even the implied warranty of
  98. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  99. # Public License for more details.
  100. #
  101. # You should have received a copy of the GNU General Public License along
  102. # with this program. If not, see <https://www.gnu.org/licenses/>.
  103. #
  104. # As a special exception, the respective Autoconf Macro's copyright owner
  105. # gives unlimited permission to copy, distribute and modify the configure
  106. # scripts that are the output of Autoconf when processing the Macro. You
  107. # need not follow the terms of the GNU General Public License when using
  108. # or distributing such scripts, even though portions of the text of the
  109. # Macro appear in them. The GNU General Public License (GPL) does govern
  110. # all other use of the material that constitutes the Autoconf Macro.
  111. #
  112. # This special exception to the GPL applies to versions of the Autoconf
  113. # Macro released by the Autoconf Archive. When you make and distribute a
  114. # modified version of the Autoconf Macro, you may extend this special
  115. # exception to the GPL to apply to your modified version as well.
  116. #serial 16
  117. AC_DEFUN([AX_PREFIX_CONFIG_H],[dnl
  118. AC_PREREQ([2.62])
  119. AC_BEFORE([AC_CONFIG_HEADERS],[$0])dnl
  120. AC_CONFIG_COMMANDS(m4_default([$1], [$PACKAGE-config.h]),[dnl
  121. AS_VAR_PUSHDEF([_OUT],[ac_prefix_conf_OUT])dnl
  122. AS_VAR_PUSHDEF([_DEF],[ac_prefix_conf_DEF])dnl
  123. AS_VAR_PUSHDEF([_PKG],[ac_prefix_conf_PKG])dnl
  124. AS_VAR_PUSHDEF([_LOW],[ac_prefix_conf_LOW])dnl
  125. AS_VAR_PUSHDEF([_UPP],[ac_prefix_conf_UPP])dnl
  126. AS_VAR_PUSHDEF([_INP],[ac_prefix_conf_INP])dnl
  127. m4_pushdef([_script],[conftest.prefix])dnl
  128. m4_pushdef([_symbol],[m4_cr_Letters[]m4_cr_digits[]_])dnl
  129. _OUT=`echo m4_default([$1], [$PACKAGE-config.h])`
  130. _DEF=`echo _$_OUT | sed -e "y:m4_cr_letters:m4_cr_LETTERS[]:" -e "s/@<:@^m4_cr_Letters@:>@/_/g"`
  131. _PKG=`echo m4_default([$2], [$PACKAGE])`
  132. _LOW=`echo _$_PKG | sed -e "y:m4_cr_LETTERS-:m4_cr_letters[]_:"`
  133. _UPP=`echo $_PKG | sed -e "y:m4_cr_letters-:m4_cr_LETTERS[]_:" -e "/^@<:@m4_cr_digits@:>@/s/^/_/"`
  134. _INP=`echo "$3" | sed -e 's/ *//'`
  135. if test ".$_INP" = "."; then
  136. for ac_file in : $CONFIG_HEADERS; do test "_$ac_file" = _: && continue
  137. case "$ac_file" in
  138. *.h) _INP=$ac_file ;;
  139. *)
  140. esac
  141. test ".$_INP" != "." && break
  142. done
  143. fi
  144. if test ".$_INP" = "."; then
  145. case "$_OUT" in
  146. */*) _INP=`basename "$_OUT"`
  147. ;;
  148. *-*) _INP=`echo "$_OUT" | sed -e "s/@<:@_symbol@:>@*-//"`
  149. ;;
  150. *) _INP=config.h
  151. ;;
  152. esac
  153. fi
  154. if test -z "$_PKG" ; then
  155. AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
  156. else
  157. if test ! -f "$_INP" ; then if test -f "$srcdir/$_INP" ; then
  158. _INP="$srcdir/$_INP"
  159. fi fi
  160. AC_MSG_NOTICE(creating $_OUT - prefix $_UPP for $_INP defines)
  161. if test -f $_INP ; then
  162. AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_LETTERS[]_@:>@\\)/@%:@undef $_UPP""_\\1/"]) > _script
  163. AS_ECHO(["s/^@%:@undef *\\(@<:@m4_cr_letters@:>@\\)/@%:@undef $_LOW""_\\1/"]) >> _script
  164. AS_ECHO(["s/^@%:@def[]ine *\\(@<:@m4_cr_LETTERS[]_@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_UPP""_\\1\\"]) >> _script
  165. AS_ECHO(["@%:@def[]ine $_UPP""_\\1\\2\\"]) >> _script
  166. AS_ECHO(["@%:@endif/"]) >> _script
  167. AS_ECHO(["s/^@%:@def[]ine *\\(@<:@m4_cr_letters@:>@@<:@_symbol@:>@*\\)\\(.*\\)/@%:@ifndef $_LOW""_\\1\\"]) >> _script
  168. AS_ECHO(["@%:@define $_LOW""_\\1\\2\\"]) >> _script
  169. AS_ECHO(["@%:@endif/"]) >> _script
  170. # now executing _script on _DEF input to create _OUT output file
  171. echo "@%:@ifndef $_DEF" >$tmp/pconfig.h
  172. echo "@%:@def[]ine $_DEF 1" >>$tmp/pconfig.h
  173. echo ' ' >>$tmp/pconfig.h
  174. echo /'*' $_OUT. Generated automatically at end of configure. '*'/ >>$tmp/pconfig.h
  175. sed -f _script $_INP >>$tmp/pconfig.h
  176. echo ' ' >>$tmp/pconfig.h
  177. echo '/* once:' $_DEF '*/' >>$tmp/pconfig.h
  178. echo "@%:@endif" >>$tmp/pconfig.h
  179. if cmp -s $_OUT $tmp/pconfig.h 2>/dev/null; then
  180. AC_MSG_NOTICE([$_OUT is unchanged])
  181. else
  182. ac_dir=`AS_DIRNAME(["$_OUT"])`
  183. AS_MKDIR_P(["$ac_dir"])
  184. rm -f "$_OUT"
  185. mv $tmp/pconfig.h "$_OUT"
  186. fi
  187. else
  188. AC_MSG_ERROR([input file $_INP does not exist - skip generating $_OUT])
  189. fi
  190. rm -f conftest.*
  191. fi
  192. m4_popdef([_symbol])dnl
  193. m4_popdef([_script])dnl
  194. AS_VAR_POPDEF([_INP])dnl
  195. AS_VAR_POPDEF([_UPP])dnl
  196. AS_VAR_POPDEF([_LOW])dnl
  197. AS_VAR_POPDEF([_PKG])dnl
  198. AS_VAR_POPDEF([_DEF])dnl
  199. AS_VAR_POPDEF([_OUT])dnl
  200. ],[PACKAGE="$PACKAGE"])])