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# ============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_auto_include_headers.html
# ============================================================================
#
# SYNOPSIS
#
# AX_AUTO_INCLUDE_HEADERS(INCLUDE-FILE ...)
#
# DESCRIPTION
#
# Given a space-separated list of INCLUDE-FILEs, AX_AUTO_INCLUDE_HEADERS
# will output a conditional #include for each INCLUDE-FILE. The following
# example demonstrates how AX_AUTO_INCLUDE_HEADERS's might be used in a
# configure.ac script:
#
# AH_BOTTOM([
# AX_AUTO_INCLUDE_HEADERS([sys/resource.h invent.h sys/sysinfo.h])dnl
# ])
#
# The preceding invocation instructs autoheader to put the following code
# at the bottom of the config.h file:
#
# #ifdef HAVE_SYS_RESOURCE_H
# # include <sys/resource.h>
# #endif
# #ifdef HAVE_INVENT_H
# # include <invent.h>
# #endif
# #ifdef HAVE_SYS_SYSINFO_H
# # include <sys/sysinfo.h>
# #endif
#
# Note that AX_AUTO_INCLUDE_HEADERS merely outputs #ifdef/#include/#endif
# blocks. The configure.ac script still needs to invoke AC_CHECK_HEADERS
# to #define the various HAVE_*_H preprocessor macros.
#
# Here's an easy way to get from config.h a complete list of header files
# who existence is tested by the configure script:
#
# 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 and incorporate it into
# one or more calls to AX_AUTO_INCLUDE_HEADERS.
#
# LICENSE
#
# Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 9
AC_DEFUN([AX_AUTO_INCLUDE_HEADERS], [dnl
AC_FOREACH([AX_Header], [$1], [dnl
m4_pushdef([AX_IfDef], AS_TR_CPP(HAVE_[]AX_Header))dnl
[#]ifdef AX_IfDef
[#] include <AX_Header>
[#]endif
m4_popdef([AX_IfDef])dnl
])])
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