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/usr/include/boost/predef/os

Name	Size	Mode	Actions
bsd/	-	0755	rm
aix.h	1732	0644	edit dl rm
amigaos.h	1123	0644	edit dl rm
beos.h	1026	0644	edit dl rm
bsd.h	3072	0644	edit dl rm
cygwin.h	1234	0644	edit dl rm
haiku.h	1093	0644	edit dl rm
hpux.h	1123	0644	edit dl rm
ios.h	1365	0644	edit dl rm
irix.h	1065	0644	edit dl rm
linux.h	1219	0644	edit dl rm
macos.h	1808	0644	edit dl rm
os400.h	1052	0644	edit dl rm
qnxnto.h	1518	0644	edit dl rm
solaris.h	1129	0644	edit dl rm
unix.h	1889	0644	edit dl rm
vms.h	1196	0644	edit dl rm
windows.h	1353	0644	edit dl rm

Edit: /usr/include/boost/predef/os/cygwin.h (1234B)

/*
Copyright Rene Rivera 2008-2015
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/

#ifndef BOOST_PREDEF_OS_CYGWIN_H
#define BOOST_PREDEF_OS_CYGWIN_H

#include <boost/predef/version_number.h>
#include <boost/predef/make.h>

/* tag::reference[]
= `BOOST_OS_CYGWIN`

http://en.wikipedia.org/wiki/Cygwin[Cygwin] evironment.

[options="header"]
|===
| {predef_symbol} | {predef_version}

| `+__CYGWIN__+` | {predef_detection}

| `CYGWIN_VERSION_API_MAJOR`, `CYGWIN_VERSION_API_MINOR` | V.R.0
|===
*/ // end::reference[]

#define BOOST_OS_CYGWIN BOOST_VERSION_NUMBER_NOT_AVAILABLE

#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && ( \
    defined(__CYGWIN__) \
    )
#   include <cygwin/version.h>
#   undef BOOST_OS_CYGWIN
#   define BOOST_OS_CYGWIN \
        BOOST_VERSION_NUMBER(CYGWIN_VERSION_API_MAJOR,\
                             CYGWIN_VERSION_API_MINOR, 0)
#endif

#if BOOST_OS_CYGWIN
#   define BOOST_OS_CYGWIN_AVAILABLE
#   include <boost/predef/detail/os_detected.h>
#endif

#define BOOST_OS_CYGWIN_NAME "Cygwin"

#endif

#include <boost/predef/detail/test.h>
BOOST_PREDEF_DECLARE_TEST(BOOST_OS_CYGWIN,BOOST_OS_CYGWIN_NAME)

/* Copyright Rene Rivera 2008-2015 Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) */ #ifndef BOOST_PREDEF_OS_CYGWIN_H #define BOOST_PREDEF_OS_CYGWIN_H #include #include /* tag::reference[] = `BOOST_OS_CYGWIN` http://en.wikipedia.org/wiki/Cygwin[Cygwin] evironment. [options="header"] |=== | {predef_symbol} | {predef_version} | `+__CYGWIN__+` | {predef_detection} | `CYGWIN_VERSION_API_MAJOR`, `CYGWIN_VERSION_API_MINOR` | V.R.0 |=== */ // end::reference[] #define BOOST_OS_CYGWIN BOOST_VERSION_NUMBER_NOT_AVAILABLE #if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && ( \ defined(__CYGWIN__) \ ) # include # undef BOOST_OS_CYGWIN # define BOOST_OS_CYGWIN \ BOOST_VERSION_NUMBER(CYGWIN_VERSION_API_MAJOR,\ CYGWIN_VERSION_API_MINOR, 0) #endif #if BOOST_OS_CYGWIN # define BOOST_OS_CYGWIN_AVAILABLE # include #endif #define BOOST_OS_CYGWIN_NAME "Cygwin" #endif #include BOOST_PREDEF_DECLARE_TEST(BOOST_OS_CYGWIN,BOOST_OS_CYGWIN_NAME)