Make win32_io only for MSVC

This excludes cygwin and mingw from using the self implemented
functions.

src/google/protobuf/compiler/command_line_interface.cc

@@ -108,7 +108,7 @@ namespace compiler {
 #endif
 
 namespace {
-#if defined(_WIN32) && !defined(__CYGWIN__)
+#if defined(_MSC_VER)
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::access;

src/google/protobuf/compiler/command_line_interface_unittest.cc

@@ -69,7 +69,7 @@ namespace google {
 namespace protobuf {
 namespace compiler {
 
-#if defined(_WIN32)
+#if defined(_MSC_VER)
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::access;

src/google/protobuf/compiler/importer.cc

@@ -59,6 +59,9 @@
 
 #ifdef _WIN32
 #include <ctype.h>
+#endif
+
+#ifdef _MSC_VER
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::access;

src/google/protobuf/compiler/objectivec/objectivec_helpers.cc

@@ -50,7 +50,7 @@
 #include <google/protobuf/stubs/io_win32.h>
 #include <google/protobuf/stubs/strutil.h>
 
-#if defined(_WIN32)
+#if defined(_MSC_VER)
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::open;

src/google/protobuf/compiler/plugin.cc

@@ -49,7 +49,7 @@
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
 
-#if defined(_WIN32)
+#if defined(_MSC_VER)
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::setmode;

src/google/protobuf/io/zero_copy_stream_impl.cc

@@ -56,6 +56,9 @@ namespace io {
 // Win32 lseek is broken:  If invoked on a non-seekable file descriptor, its
 // return value is undefined.  We re-define it to always produce an error.
 #define lseek(fd, offset, origin) ((off_t)-1)
+#endif
+
+#ifdef _MSC_VER
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::access;

src/google/protobuf/io/zero_copy_stream_unittest.cc

@@ -83,6 +83,9 @@ namespace {
 
 #ifdef _WIN32
 #define pipe(fds) _pipe(fds, 4096, O_BINARY)
+#endif
+
+#ifdef _MSC_VER
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::access;

src/google/protobuf/message_unittest.cc

@@ -63,7 +63,7 @@
 namespace google {
 namespace protobuf {
 
-#if defined(_WIN32)
+#if defined(_MSC_VER)
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::close;

src/google/protobuf/stubs/io_win32.cc

@@ -39,15 +39,13 @@
 //
 // This file is only used on Windows, it's empty on other platforms.
 
-#if defined(_WIN32)
+#if defined(_MSC_VER)
 
 // Comment this out to fall back to using the ANSI versions (open, mkdir, ...)
 // instead of the Unicode ones (_wopen, _wmkdir, ...). Doing so can be useful to
 // debug failing tests if that's caused by the long path support.
 // Long path support is disabled in MinGW
-#ifndef __MINGW32__
 #define SUPPORT_LONGPATHS
-#endif  // !__MINGW32__
 
 #include <ctype.h>
 #include <direct.h>
@@ -361,5 +359,5 @@ wstring testonly_path_to_winpath(const string& path) {
 }  // namespace protobuf
 }  // namespace google
 
-#endif  // defined(_WIN32)
+#endif  // defined(_MSC_VER)
 

src/google/protobuf/stubs/io_win32.h

@@ -45,7 +45,7 @@
 #ifndef GOOGLE_PROTOBUF_STUBS_IO_WIN32_H__
 #define GOOGLE_PROTOBUF_STUBS_IO_WIN32_H__
 
-#if defined(_WIN32)
+#if defined(_MSC_VER)
 
 #include <string>
 #include <google/protobuf/stubs/port.h>
@@ -91,7 +91,7 @@ LIBPROTOBUF_EXPORT std::wstring testonly_path_to_winpath(
 #define STDOUT_FILENO 1
 #endif
 
-#endif  // defined(_WIN32)
+#endif  // defined(_MSC_VER)
 
 #endif  // GOOGLE_PROTOBUF_STUBS_IO_WIN32_H__
 

src/google/protobuf/testing/file.cc

@@ -55,6 +55,9 @@ namespace protobuf {
 #define lstat stat
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
+#endif
+
+#ifdef _MSC_VER
 using google::protobuf::internal::win32::access;
 using google::protobuf::internal::win32::chdir;
 using google::protobuf::internal::win32::fopen;

src/google/protobuf/testing/googletest.cc

@@ -52,7 +52,7 @@
 namespace google {
 namespace protobuf {
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
 // them like we do below.
 using google::protobuf::internal::win32::close;