Replaced __linux macro with __linux__

src/libslic3r/GCodeSender.cpp

@@ -134,7 +134,7 @@ GCodeSender::set_baud_rate(unsigned int baud_rate)
         speed_t newSpeed = baud_rate;
         ioctl(handle, IOSSIOSPEED, &newSpeed);
         ::tcsetattr(handle, TCSANOW, &ios);
-#elif __linux
+#elif __linux__
         termios2 ios;
         if (ioctl(handle, TCGETS2, &ios))
             printf("Error in TCGETS2: %s\n", strerror(errno));

src/libslic3r/utils.cpp

@@ -39,9 +39,9 @@
 
 #include <tbb/task_scheduler_init.h>
 
-#if defined(__linux) || defined(__GNUC__ )
+#if defined(__linux__) || defined(__GNUC__ )
 #include <strings.h>
-#endif /* __linux */
+#endif /* __linux__ */
 
 #ifdef _MSC_VER 
     #define strcasecmp _stricmp

src/slic3r/GUI/InstanceCheck.cpp

@@ -257,7 +257,7 @@ bool instance_check(int argc, char** argv, bool app_config_single_instance)
 	hashed_path = std::hash<std::string>{}(boost::filesystem::system_complete(argv[0]).string());
 #else
 	boost::system::error_code ec;
-#ifdef __linux
+#ifdef __linux__
 	// If executed by an AppImage, start the AppImage, not the main process.
 	// see https://docs.appimage.org/packaging-guide/environment-variables.html#id2
 	const char *appimage_env = std::getenv("APPIMAGE");
@@ -275,7 +275,7 @@ bool instance_check(int argc, char** argv, bool app_config_single_instance)
 			BOOST_LOG_TRIVIAL(error) << "APPIMAGE environment variable was set, but it does not point to a valid file: " << appimage_env;
 	}
 	if (! appimage_env_valid)
-#endif // __linux
+#endif // __linux__
 		hashed_path = std::hash<std::string>{}(boost::filesystem::canonical(boost::filesystem::system_complete(argv[0]), ec).string());
 	if (ec.value() > 0) { // canonical was not able to find the executable (can happen with appimage on some systems. Does it fail on Fuse file systems?)
 		ec.clear();

src/slic3r/Utils/Process.cpp

@@ -93,7 +93,7 @@ static void start_new_slicer_or_gcodeviewer(const NewSlicerInstanceType instance
 	{
 		std::vector<const char*> args;
 		args.reserve(3);
-#ifdef __linux
+#ifdef __linux__
 		static const char* gcodeviewer_param = "--gcodeviewer";
 		{
 			// If executed by an AppImage, start the AppImage, not the main process.
@@ -105,7 +105,7 @@ static void start_new_slicer_or_gcodeviewer(const NewSlicerInstanceType instance
 					args.emplace_back(gcodeviewer_param);
 			}
 		}
-#endif // __linux
+#endif // __linux__
 		std::string my_path;
 		if (args.empty()) {
 			// Binary path was not set to the AppImage in the Linux specific block above, call the application directly.

src/slic3r/Utils/Serial.cpp

@@ -313,7 +313,7 @@ void Serial::set_baud_rate(unsigned baud_rate)
 		speed_t newSpeed = baud_rate;
 		handle_errno(::ioctl(handle, IOSSIOSPEED, &newSpeed));
 		handle_errno(::tcsetattr(handle, TCSANOW, &ios));
-#elif __linux
+#elif __linux__
 
 		/* The following definitions are kindly borrowed from:
 			/usr/include/asm-generic/termbits.h