Porting to Cygwin

This is the initial porting.

IS_CYGWIN might be changed to some other macro function.

A simple function like below code is working in Cygwin.

---
import Foundation
let swifty = NSURLComponents(string: "https://swift.org")!
print("\(swifty.host!)")
---

Author: tinysun212

CoreFoundation/Base.subproj/CFFileUtilities.c

@@ -346,7 +346,7 @@ CF_PRIVATE CFMutableArrayRef _CFCreateContentsOfDirectory(CFAllocatorRef alloc,
     FindClose(handle);
     pathBuf[pathLength] = '\0';
 
-#elif DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#elif DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
     uint8_t extBuff[CFMaxPathSize];
     int extBuffInteriorDotCount = 0; //people insist on using extensions like ".trace.plist", so we need to know how many dots back to look :(
 
@@ -456,13 +456,13 @@ CF_PRIVATE CFMutableArrayRef _CFCreateContentsOfDirectory(CFAllocatorRef alloc,
                     isDir = ((statBuf.st_mode & S_IFMT) == S_IFDIR);
                 }
             }
-#if DEPLOYMENT_TARGET_LINUX
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
             fileURL = CFURLCreateFromFileSystemRepresentationRelativeToBase(alloc, (uint8_t *)dp->d_name, namelen, isDir, dirURL);
 #else
             fileURL = CFURLCreateFromFileSystemRepresentationRelativeToBase(alloc, (uint8_t *)dp->d_name, dp->d_namlen, isDir, dirURL);
 #endif
         } else {
-#if DEPLOYMENT_TARGET_LINUX
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
             fileURL = CFURLCreateFromFileSystemRepresentationRelativeToBase (alloc, (uint8_t *)dp->d_name, namelen, false, dirURL);
 #else
             fileURL = CFURLCreateFromFileSystemRepresentationRelativeToBase (alloc, (uint8_t *)dp->d_name, dp->d_namlen, false, dirURL);
@@ -549,7 +549,7 @@ CF_PRIVATE SInt32 _CFGetPathProperties(CFAllocatorRef alloc, char *path, Boolean
 
     if (modTime != NULL) {
         if (fileExists) {
-#if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX
+#if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
             struct timespec ts = {statBuf.st_mtime, 0};
 #else
             struct timespec ts = statBuf.st_mtimespec;
@@ -1073,7 +1073,7 @@ CF_PRIVATE void _CFIterateDirectory(CFStringRef directoryPath, Boolean appendSla
     struct dirent *dent;
     if ((dirp = opendir(directoryPathBuf))) {
         while ((dent = readdir(dirp))) {
-#if DEPLOYMENT_TARGET_LINUX
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
             CFIndex nameLen = strlen(dent->d_name);
 #else
             CFIndex nameLen = dent->d_namlen;

CoreFoundation/Base.subproj/CFInternal.h

@@ -97,8 +97,11 @@ CF_EXTERN_C_BEGIN
 #include <CoreFoundation/CFLogUtilities.h>
 #include <CoreFoundation/CFRuntime.h>
 #include <limits.h>
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
+#if DEPLOYMENT_TARGET_CYGWIN
+#else
 #include <xlocale.h>
+#endif
 #include <unistd.h>
 #include <sys/time.h>
 #include <signal.h>
@@ -484,7 +487,7 @@ CF_INLINE Boolean __CFLockTry(volatile CFLock_t *lock) {
     return (InterlockedCompareExchange((LONG volatile *)lock, ~0, 0) == 0);
 }
 
-#elif DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#elif DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 
 typedef int32_t CFLock_t;
 #define CFLockInit 0
@@ -814,6 +817,8 @@ CF_PRIVATE const wchar_t *_CFDLLPath(void);
 #define PATH_SEP_STR CFSTR("/")
 #endif
 
+#include <stdio.h>
+
 CF_INLINE const char *CFPathRelativeToAppleFrameworksRoot(const char *path, Boolean *allocated) {
     if (!__CFProcessIsRestricted() && path) {
         const char *platformRoot = __CFgetenv("APPLE_FRAMEWORKS_ROOT");

CoreFoundation/Base.subproj/CFPlatform.c

@@ -162,7 +162,9 @@ const char *_CFProcessPath(void) {
 Boolean _CFIsMainThread(void) {
     return syscall(SYS_gettid) == getpid();
 }
+#endif
 
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
 const char *_CFProcessPath(void) {
     if (__CFProcessPath) return __CFProcessPath;
     char buf[CFMaxPathSize + 1];
@@ -196,7 +198,7 @@ CF_PRIVATE CFStringRef _CFProcessNameString(void) {
 }
 
 
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 
 #include <pwd.h>
 #include <sys/param.h>
@@ -240,7 +242,7 @@ CF_EXPORT CFStringRef CFGetUserName(void) {
 
 CF_EXPORT CFStringRef CFCopyUserName(void) {
     CFStringRef result = NULL;
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
     uid_t euid;
     __CFGetUGIDs(&euid, NULL);
     struct passwd *upwd = getpwuid(euid ? euid : getuid());
@@ -274,7 +276,7 @@ CF_EXPORT CFStringRef CFCopyUserName(void) {
 }
 
 CFURLRef CFCopyHomeDirectoryURL(void) {
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
     uid_t euid;
     __CFGetUGIDs(&euid, NULL);
     struct passwd *upwd = getpwuid(euid ? euid : getuid());
@@ -357,7 +359,7 @@ CF_EXPORT CFURLRef CFCopyHomeDirectoryURLForUser(CFStringRef uName) {
         }
     }
 #endif
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
     if (!uName) {
         uid_t euid;
         __CFGetUGIDs(&euid, NULL);
@@ -568,7 +570,7 @@ CF_PRIVATE void __CFFinalizeWindowsThreadData() {
 #endif
 
 
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 static pthread_key_t __CFTSDIndexKey;
 #endif
 
@@ -1067,7 +1069,7 @@ CF_PRIVATE int _NS_gettimeofday(struct timeval *tv, struct timezone *tz) {
 #pragma mark -
 #pragma mark Linux OSAtomic
 
-#if defined(DEPLOYMENT_TARGET_LINUX) || defined(DEPLOYMENT_TARGET_FREEBSD)
+#if defined(DEPLOYMENT_TARGET_LINUX) || defined(DEPLOYMENT_TARGET_FREEBSD) || defined(DEPLOYMENT_TARGET_CYGWIN)
 
 bool OSAtomicCompareAndSwapPtr(void *oldp, void *newp, void *volatile *dst) 
 { 

CoreFoundation/Base.subproj/CFPriv.h

@@ -36,7 +36,7 @@
 #include <CoreFoundation/CFMessagePort.h>
 #endif
 
-#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) || (TARGET_OS_EMBEDDED || TARGET_OS_IPHONE) || TARGET_OS_WIN32 || TARGET_OS_LINUX
+#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) || (TARGET_OS_EMBEDDED || TARGET_OS_IPHONE) || TARGET_OS_WIN32 || TARGET_OS_LINUX || DEPLOYMENT_TARGET_CYGWIN
 #include <CoreFoundation/CFRunLoop.h>
 #include <CoreFoundation/CFSocket.h>
 #include <CoreFoundation/CFBundlePriv.h>
@@ -565,7 +565,7 @@ CF_EXPORT CFMessagePortRef _CFMessagePortCreateLocalEx(CFAllocatorRef allocator,
 
 #if TARGET_OS_MAC || TARGET_OS_EMBEDDED || TARGET_OS_IPHONE
 #include <pthread.h>
-#elif !TARGET_OS_LINUX
+#elif !TARGET_OS_LINUX && !TARGET_OS_CYGWIN
 // Avoid including the pthread header
 #ifndef HAVE_STRUCT_TIMESPEC
 #define HAVE_STRUCT_TIMESPEC 1
@@ -600,7 +600,7 @@ CF_EXPORT bool _CFPropertyListCreateSingleValue(CFAllocatorRef allocator, CFData
 // Returns a subset of the property list, only including the keyPaths in the CFSet. If the top level object is not a dictionary, you will get back an empty dictionary as the result.
 CF_EXPORT bool _CFPropertyListCreateFiltered(CFAllocatorRef allocator, CFDataRef data, CFOptionFlags option, CFSetRef keyPaths, CFPropertyListRef *value, CFErrorRef *error) CF_AVAILABLE(10_8, 6_0);
 
-#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) || (TARGET_OS_EMBEDDED || TARGET_OS_IPHONE) || TARGET_OS_WIN32 || TARGET_OS_LINUX
+#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) || (TARGET_OS_EMBEDDED || TARGET_OS_IPHONE) || TARGET_OS_WIN32 || TARGET_OS_LINUX || DEPLOYMENT_TARGET_CYGWIN
 
 // Returns a subset of a bundle's Info.plist. The keyPaths follow the same rules as above CFPropertyList function. This function takes platform and product keys into account.
 typedef CF_OPTIONS(CFOptionFlags, _CFBundleFilteredPlistOptions) {

CoreFoundation/Base.subproj/CFRuntime.c

@@ -55,7 +55,7 @@ __kCFReleaseEvent = 29
 
 #if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX
 #include <malloc.h>
-#elif DEPLOYMENT_TARGET_FREEBSD
+#elif DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 #include <stdlib.h> // malloc()
 #else
 #include <malloc/malloc.h>
@@ -486,7 +486,7 @@ enum {
 #if DEPLOYMENT_TARGET_MACOSX
 #define NUM_EXTERN_TABLES 8
 #define EXTERN_TABLE_IDX(O) (((uintptr_t)(O) >> 8) & 0x7)
-#elif DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#elif DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 #define NUM_EXTERN_TABLES 1
 #define EXTERN_TABLE_IDX(O) 0
 #else
@@ -862,7 +862,7 @@ extern void __CFStringInitialize(void);
 extern void __CFCharacterSetInitialize(void);
 extern void __CFPFactoryInitialize(void);
 extern void __CFPlugInInitialize(void);
-#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_MACOSX
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_CYGWIN
 CF_PRIVATE void __CFTSDInitialize();
 #endif
 #if DEPLOYMENT_TARGET_WINDOWS
@@ -986,7 +986,7 @@ CF_PRIVATE Boolean __CFInitialized = 0;
 // move the next 2 lines down into the #if below, and make it static, after Foundation gets off this symbol on other platforms
 CF_EXPORT pthread_t _CFMainPThread;
 pthread_t _CFMainPThread = kNilPthreadT;
-#if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_IPHONESIMULATOR || DEPLOYMENT_TARGET_LINUX
+#if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_IPHONESIMULATOR || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
 
 CF_EXPORT pthread_t _CF_pthread_main_thread_np(void);
 pthread_t _CF_pthread_main_thread_np(void) {
@@ -996,7 +996,7 @@ pthread_t _CF_pthread_main_thread_np(void) {
 
 #endif
 
-#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 static void __CFInitialize(void) __attribute__ ((constructor));
 static
 #endif
@@ -1016,7 +1016,7 @@ void __CFInitialize(void) {
 #if DEPLOYMENT_TARGET_WINDOWS
         // Must not call any CF functions
         __CFTSDWindowsInitialize();
-#elif DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_MACOSX
+#elif DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_CYGWIN
         __CFTSDInitialize();
 #endif
 
@@ -1048,7 +1048,7 @@ void __CFInitialize(void) {
 #if DEPLOYMENT_RUNTIME_SWIFT
 
         #ifndef __CFSwiftGetBaseClass
-        #if TARGET_OS_LINUX
+        #if TARGET_OS_LINUX || DEPLOYMENT_TARGET_CYGWIN
         #define __CFSwiftGetBaseClass _TF10Foundation21__CFSwiftGetBaseClassFT_PMPs9AnyObject_
         #elif TARGET_OS_MAC
         #define __CFSwiftGetBaseClass _TF15SwiftFoundation21__CFSwiftGetBaseClassFT_PMPs9AnyObject_
@@ -1161,7 +1161,7 @@ void __CFInitialize(void) {
 #if DEPLOYMENT_RUNTIME_SWIFT
         _CFKeyedArchiverUIDGetTypeID();
         #ifndef __CFInitializeSwift
-        #if TARGET_OS_LINUX
+        #if TARGET_OS_LINUX || DEPLOYMENT_TARGET_CYGWIN
         #define __CFInitializeSwift _TF10Foundation19__CFInitializeSwiftFT_T_
         #elif TARGET_OS_MAC
         #define __CFInitializeSwift _TF15SwiftFoundation19__CFInitializeSwiftFT_T_

CoreFoundation/Base.subproj/CFUtilities.c

@@ -56,7 +56,7 @@
 #include <sys/errno.h>
 #include <mach/mach_time.h>
 #endif
-#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 #include <string.h>
 #include <pthread.h>
 #include <sys/mman.h>
@@ -1087,7 +1087,7 @@ CF_PRIVATE Boolean _CFReadMappedFromFile(CFStringRef path, Boolean map, Boolean
     if (0LL == statBuf.st_size) {
         bytes = malloc(8); // don't return constant string -- it's freed!
 	length = 0;
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
     } else if (map) {
         if((void *)-1 == (bytes = mmap(0, (size_t)statBuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0))) {
 	    int32_t savederrno = errno;
@@ -1261,7 +1261,7 @@ CFDictionaryRef __CFGetEnvironment() {
 #if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED
         extern char ***_NSGetEnviron();
         char **envp = *_NSGetEnviron();
-#elif DEPLOYMENT_TARGET_FREEBSD
+#elif DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
         extern char **environ;
         char **envp = environ;
 #elif DEPLOYMENT_TARGET_LINUX

CoreFoundation/Base.subproj/CoreFoundation_Prefix.h

@@ -162,7 +162,7 @@ typedef int		boolean_t;
 #include <sys/stat.h> // mode_t
 #endif
 
-#if DEPLOYMENT_TARGET_LINUX
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
 
 #define CF_PRIVATE __attribute__((visibility("hidden")))
 #define __strong
@@ -178,6 +178,8 @@ typedef int		boolean_t;
 
 #include <pthread.h>
 
+#if DEPLOYMENT_TARGET_CYGWIN
+#else
 CF_INLINE size_t
 strlcpy(char * dst, const char * src, size_t maxlen) {
     const size_t srclen = strlen(src);
@@ -205,6 +207,7 @@ strlcat(char * dst, const char * src, size_t maxlen) {
 }
 
 #define issetugid() 0
+#endif
 
 // Implemented in CFPlatform.c 
 bool OSAtomicCompareAndSwapPtr(void *oldp, void *newp, void *volatile *dst);
@@ -263,7 +266,14 @@ void OSMemoryBarrier();
 
 #endif
 
-#if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX    
+#if DEPLOYMENT_TARGET_CYGWIN
+#define HAVE_STRUCT_TIMESPEC 1
+#define strncasecmp_l(a, b, c, d) strncasecmp(a, b, c)
+#define _NO_BOOL_TYPEDEF
+#undef interface
+#endif
+
+#if DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN 
 #if !defined(MIN)
 #define MIN(A,B)	((A) < (B) ? (A) : (B))
 #endif
@@ -463,7 +473,7 @@ CF_EXPORT int64_t OSAtomicAdd64Barrier( int64_t __theAmount, volatile int64_t *_
 #define CF_PRIVATE __attribute__((__visibility__("hidden")))
 #endif
 
-#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_WINDOWS
+#if DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_CYGWIN
 
 #include <stdarg.h>
 

CoreFoundation/Base.subproj/SwiftRuntime/TargetConditionals.h

@@ -46,6 +46,7 @@
     
         TARGET_OS_WIN32           - Generated code will run under 32-bit Windows
         TARGET_OS_UNIX            - Generated code will run under some Unix (not OSX) 
+           TARGET_OS_CYGWIN           - Generated code will run under 64-bit Cygwin
         TARGET_OS_MAC             - Generated code will run under Mac OS X variant
            TARGET_OS_IPHONE          - Generated code for firmware, devices, or simulator 
               TARGET_OS_IOS             - Generated code will run under iOS 
@@ -76,21 +77,31 @@
 #define TARGET_OS_LINUX        0
 #define TARGET_OS_WINDOWS      0
 #define TARGET_OS_BSD          0
+#define TARGET_OS_CYGWIN       0
 #elif __linux__
 #define TARGET_OS_DARWIN       0
 #define TARGET_OS_LINUX        1
 #define TARGET_OS_WINDOWS      0
 #define TARGET_OS_BSD          0
+#define TARGET_OS_CYGWIN       0
+#elif __CYGWIN__
+#define TARGET_OS_DARWIN       0
+#define TARGET_OS_LINUX        0
+#define TARGET_OS_WINDOWS      0
+#define TARGET_OS_BSD          0
+#define TARGET_OS_CYGWIN       1
 #elif _WIN32 || _WIN64
 #define TARGET_OS_DARWIN       0
 #define TARGET_OS_LINUX        0
 #define TARGET_OS_WINDOWS      1
 #define TARGET_OS_BSD          0
+#define TARGET_OS_CYGWIN       0
 #elif __unix__
 #define TARGET_OS_DARWIN       0
 #define TARGET_OS_LINUX        0
 #define TARGET_OS_WINDOWS      0
 #define TARGET_OS_BSD          1
+#define TARGET_OS_CYGWIN       0
 #else
 #error unknown operating system
 #endif

CoreFoundation/Collections.subproj/CFData.c

@@ -35,7 +35,7 @@ CF_INLINE unsigned long __CFPageSize() {
     GetSystemInfo(&sysInfo);
     return sysInfo.dwPageSize;
 }
-#elif DEPLOYMENT_TARGET_LINUX
+#elif DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_CYGWIN
 #include <unistd.h>
 CF_INLINE unsigned long __CFPageSize() {
     return (unsigned long)getpagesize();

CoreFoundation/Locale.subproj/CFLocale.c

@@ -24,7 +24,7 @@
 #include <CoreFoundation/CFNumber.h>
 #include "CFInternal.h"
 #include "CFLocaleInternal.h"
-#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 #include <unicode/uloc.h>           // ICU locales
 #include <unicode/ulocdata.h>       // ICU locale data
 #include <unicode/ucal.h>
@@ -283,7 +283,7 @@ static CFLocaleRef __CFLocaleCurrent = NULL;
 #define FALLBACK_LOCALE_NAME CFSTR("")
 #elif DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_EMBEDDED_MINI
 #define FALLBACK_LOCALE_NAME CFSTR("en_US")
-#elif DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD
+#elif DEPLOYMENT_TARGET_WINDOWS || DEPLOYMENT_TARGET_LINUX || DEPLOYMENT_TARGET_FREEBSD || DEPLOYMENT_TARGET_CYGWIN
 #define FALLBACK_LOCALE_NAME CFSTR("en_US")
 #endif