Macro: ac_auto_include_headers

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Synopsis

  `AC_AUTO_INCLUDE_HEADERS (HEADER-FILE, INCLUDE-FILE ...)`

Version

  1.1 (2002/03/17) Installed_Packages @ ac-archive-0.5.39

Author

  Scott Pakin <pakin@uiuc.edu>

Description

  Given a HEADER-FILE and a space-separated list of INCLUDE-FILEs, AC_AUTO_INCLUDE_HEADERS will append to HEADER-FILE a conditional #include for each INCLUDE-FILE. For instance, the following macro call:

  `AC_AUTO_INCLUDE_HEADERS([config-inc.h], [sys/foobar.h])`

  will append the following text to config-inc.h:

  `#ifdef HAVE_SYS_FOOBAR_H`
  `# include <sys/foobar.h>`
  `#endif`

  AC_AUTO_INCLUDE_HEADERS makes it easy to auto-generate a single header file that can then be #include'd by multiple files in a project. Because the #ifdef's are appended to HEADER-FILE, it's also convenient to include additional text in that file. For instance:

  `cat <<\CIH_EOF > config-inc.h`
  `/* This file was generated automatically by configure. */`

  `#ifndef _CONFIG_INC_H_`
  `#define _CONFIG_INC_H_`

  `#include <stdio.h>`

  `CIH_EOF`
  `AC_AUTO_INCLUDE_HEADERS([config-inc.h], [arpa/inet.h dlfcn.h errno.h])`
  `echo "#endif" >> config-inc.h`

  Here's an easy way to get a complete list of header files from config.h:

  `cat config.h | perl -ane '/ HAVE_\S+_H / && do {$_=$F[$#F-1]; s/^HAVE_//; s/_H/.h/; s|_|/|g; tr/A-Z/a-z/; print "$_ "}'`

  You can then manually edit the resulting list.

M4 Source Code

      AC_DEFUN([AC_AUTO_INCLUDE_HEADERS],
      [touch $1
      for ac_auto_include_file in $2; do
        ac_auto_include_have=`echo $ac_auto_include_file | sed 'y%./*abcdefghijklmnopqrstuvwxyz%__PABCDEFGHIJKLMNOPQRSTUVWXYZ%;s%[^_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]%_%g'`
        echo "#ifdef HAVE_$ac_auto_include_have" >> $1
        echo "# include <$ac_auto_include_file>" >> $1
        echo "#endif" >> $1
        echo "" >> $1
      done])