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.\" Copyright (c) 2009-2018 by Aleksey Cheusov (vle@gmx.net)
.\" Absolutely no warranty.
.\"
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.TH MKC_CHECK_HEADER 1 "Mar 30, 2019" "" ""
.SH NAME
mkc_check_header \- detects presense of header file.
.SH SYNOPSIS
.BI mkc_check_header " [OPTIONS] <headers>"
.SH DESCRIPTION
.B mkc_check_header
detects presense of header file.
As a result it prints either 1 (true) or 0 (false) to stdout.
.I headers
may be either a single header file or a list of headers separated by comma.
In this case all mentioned headers are put into a single .c file and
.I "${CC}"
is run.
By default
.I "$CC -c"
is used for checking.
By default, temporary and cache files
.RI _mkc_header_ lheader_h .{c,err,res}
are created under
.B MKC_CACHEDIR
directory. Here,
.I lheader_h
is the last header from comma-separated list
.IR headers .
.SH OPTIONS
.TP
.B "-h"
Display help message.
.TP
.B "-e"
Use
.I "$CC -E"
for checking instead of
.IR "$CC -c" .
.TP
.B "-d"
Delete cache file.
.SH ENVIRONMENT
.TP
.B CC
Compiler. By default
.I cc
is used.
.TP
.B CPPFLAGS, CFLAGS
Options passed to the compiler.
.TP
.B MKC_VERBOSE
If set to 1, verbose messages are output to stderr.
.TP
.B MKC_SHOW_CACHED
If set to 1 and MKC_VERBOSE is set to 1, cached results
are output to stderr.
.TP
.B MKC_CACHEDIR
Directory where temporary and cache files are created.
If unset they are created in a current directory.
.TP
.B MKC_NOCACHE
All results are cached unless MKC_NOCACHE variable is set
to 1.
.TP
.B MKC_DELETE_TMPFILES
If set to 1, temporary files are removed.
.SH EXAMPLES
.VS
   mkc_check_header stdint.h
   mkc_check_header getopt.h
   mkc_check_header sys/types.h,sys/stat.h,fts.h
.VE
.SH C FILE CONTENT
.VS
#include <header1.h>
 ...
#include <headerN.h>
int __fake_variable;
.VE
.SH AUTHOR
Aleksey Cheusov <vle@gmx.net>