AC_CREATE_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
, 

2006-10-13

Guido U. Draheim <guidod@gmx.de>

GPLWithACException
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts

cryp.to ac-archive's Obsoleted (obsoleted)

• obsoleted Use AX_PREFIX_CONFIG_H.

• * this is a new variant from ac_prefix_config_ this one will use a

lowercase-prefix if the config-define was starting with a lowercase-char, e.g.

 #define const or #define restrict or #define off_t

(and this one can live in another directory, e.g. testpkg/config.h therefore I decided to move the output-header to be the first arg)

takes the usual config.h generated header file; looks for each of the generated "#define SOMEDEF" lines, and prefixes the defined name (ie. makes it "#define PREFIX_SOMEDEF". The result is written to the output config.header file. The PREFIX is converted to uppercase for the conversions.

• - default OUTPUT-HEADER = $PACKAGE-config.h - default PREFIX =

$PACKAGE - default ORIG-HEADER, derived from OUTPUT-HEADER

       if OUTPUT-HEADER has a "/", use the basename
       if OUTPUT-HEADER has a "-", use the section after it.
       otherwise, just config.h

In most cases, the configure.in will contain a line saying

       AC_CONFIG_HEADER(config.h)

somewhere *before* AC_OUTPUT and a simple line saying

      AC_PREFIX_CONFIG_HEADER

somewhere *after* AC_OUTPUT.

example:

 AC_INIT(config.h.in)        # config.h.in as created by "autoheader"
 AM_INIT_AUTOMAKE(testpkg, 0.1.1)   # "#undef VERSION" and "PACKAGE"
 AM_CONFIG_HEADER(config.h)         #                in config.h.in
 AC_MEMORY_H                        # "#undef NEED_MEMORY_H"
 AC_C_CONST_H                       # "#undef const"
 AC_OUTPUT(Makefile)                # creates the "config.h" now
 AC_CREATE_PREFIX_CONFIG_H          # creates "testpkg-config.h"
       and the resulting "testpkg-config.h" contains lines like
 #ifndef TESTPKG_VERSION
 #define TESTPKG_VERSION "0.1.1"
 #endif
 #ifndef TESTPKG_NEED_MEMORY_H
 #define TESTPKG_NEED_MEMORY_H 1
 #endif
 #ifndef _testpkg_const
 #define _testpkg_const const
 #endif

 and this "testpkg-config.h" can be installed along with other
 header-files, which is most convenient when creating a shared
 library (that has some headers) where some functionality is
 dependent on the OS-features detected at compile-time. No
 need to invent some "testpkg-confdefs.h.in" manually. :-)

AC_DEFUN([AC_CREATE_PREFIX_CONFIG_H],
[changequote({, })dnl
ac_prefix_conf_OUT=`echo ifelse($1, , $PACKAGE-config.h, $1)`
ac_prefix_conf_DEF=`echo _$ac_prefix_conf_OUT | sed -e 'y:abcdefghijklmnopqrstuvwxyz./,-:ABCDEFGHIJKLMNOPQRSTUVWXYZ____:'`
ac_prefix_conf_PKG=`echo ifelse($2, , $PACKAGE, $2)`
ac_prefix_conf_LOW=`echo _$ac_prefix_conf_PKG | sed -e 'y:ABCDEFGHIJKLMNOPQRSTUVWXYZ-:abcdefghijklmnopqrstuvwxyz_:'`
ac_prefix_conf_UPP=`echo $ac_prefix_conf_PKG | sed -e 'y:abcdefghijklmnopqrstuvwxyz-:ABCDEFGHIJKLMNOPQRSTUVWXYZ_:'  -e '/^[0-9]/s/^/_/'`
ac_prefix_conf_INP=`echo ifelse($3, , _, $3)`
if test "$ac_prefix_conf_INP" = "_"; then
   case $ac_prefix_conf_OUT in
      */*) ac_prefix_conf_INP=`basename $ac_prefix_conf_OUT`
      ;;
      *-*) ac_prefix_conf_INP=`echo $ac_prefix_conf_OUT | sed -e 's/[a-zA-Z0-9_]*-//'`
      ;;
      *) ac_prefix_conf_INP=config.h
      ;;
   esac
fi
changequote([, ])dnl
if test -z "$ac_prefix_conf_PKG" ; then
   AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
else
  AC_MSG_RESULT(creating $ac_prefix_conf_OUT - prefix $ac_prefix_conf_UPP for $ac_prefix_conf_INP defines)
  if test -f $ac_prefix_conf_INP ; then
    AC_ECHO_MKFILE([/* automatically generated */], $ac_prefix_conf_OUT)
changequote({, })dnl
    echo '#ifndef '$ac_prefix_conf_DEF >>$ac_prefix_conf_OUT
    echo '#define '$ac_prefix_conf_DEF' 1' >>$ac_prefix_conf_OUT
    echo ' ' >>$ac_prefix_conf_OUT
    echo /'*' $ac_prefix_conf_OUT. Generated automatically at end of configure. '*'/ >>$ac_prefix_conf_OUT

    echo 's/#undef  *\([A-Z_]\)/#undef '$ac_prefix_conf_UPP'_\1/' >conftest.sed
    echo 's/#undef  *\([a-z]\)/#undef '$ac_prefix_conf_LOW'_\1/' >>conftest.sed
    echo 's/#define  *\([A-Z_][A-Za-z0-9_]*\)\(.*\)/#ifndef '$ac_prefix_conf_UPP"_\\1 \\" >>conftest.sed
    echo '#define '$ac_prefix_conf_UPP"_\\1 \\2 \\" >>conftest.sed
    echo '#endif/' >>conftest.sed
    echo 's/#define  *\([a-z][A-Za-z0-9_]*\)\(.*\)/#ifndef '$ac_prefix_conf_LOW"_\\1 \\" >>conftest.sed
    echo '#define '$ac_prefix_conf_LOW"_\\1 \\2 \\" >>conftest.sed
    echo '#endif/' >>conftest.sed
    sed -f conftest.sed $ac_prefix_conf_INP >>$ac_prefix_conf_OUT
    echo ' ' >>$ac_prefix_conf_OUT
    echo '/*' $ac_prefix_conf_DEF '*/' >>$ac_prefix_conf_OUT
    echo '#endif' >>$ac_prefix_conf_OUT
changequote([, ])dnl
  else
    AC_MSG_ERROR([input file $ac_prefix_conf_IN does not exist, dnl
    skip generating $ac_prefix_conf_OUT])
  fi
  rm -f conftest.*
fi])