build: Try to make Mac compilation more likely to succeed

I just switched all __linux to not _WIN32 in the hopes that Unix/Linux
API would be more likely to be found on Mac OS. This has not been
tested on Mac so it may or may not work.

include/debug.hh

@@ -75,7 +75,7 @@ static inline void win_get_last_error(void)
 
 static inline void log_platform_error(const char *aux)
 {
-#ifdef __linux__
+#ifndef _WIN32
         if (aux) {
             LOG_ERROR("%s: %s %d\n", aux, strerror(errno), errno);
         } else {

include/util.hh

@@ -21,7 +21,7 @@ typedef SSIZE_T ssize_t;
 #endif
 
 /* https://stackoverflow.com/questions/1537964/visual-c-equivalent-of-gccs-attribute-packed  */
-#if defined(__MINGW32__) || defined(__MINGW64__) || defined(__linux__)
+#if defined(__MINGW32__) || defined(__MINGW64__) || defined(__GNUC__)
 #define PACK(__Declaration__) __Declaration__ __attribute__((__packed__))
 #else
 #define PACK(__Declaration__) __pragma(pack(push, 1)) __Declaration__ __pragma(pack(pop))

src/pkt_dispatch.cc

@@ -6,7 +6,7 @@
 #include "random.hh"
 #include "util.hh"
 
-#ifdef __linux__
+#ifndef _WIN32
 #include <errno.h>
 #else
 #define MSG_DONTWAIT 0

src/poll.cc

@@ -63,7 +63,7 @@ rtp_error_t uvgrtp::poll::poll(std::vector<uvgrtp::socket>& sockets, uint8_t *bu
         return RTP_INVALID_VALUE;
     }
 
-#ifdef __linux__
+#ifndef _WIN32
     struct pollfd fds[uvgrtp::MULTICAST_MAX_PEERS];
     int ret;
 

src/queue.cc

@@ -53,7 +53,7 @@ rtp_error_t uvgrtp::frame_queue::init_transaction()
         active_      = new transaction_t;
         active_->key = uvgrtp::random::generate_32();
 
-#ifdef __linux__
+#ifndef _WIN32
         active_->headers     = new struct mmsghdr[max_mcount_];
         active_->chunks      = new struct iovec[max_ccount_];
 #else

src/queue.hh

@@ -53,7 +53,7 @@ namespace uvgrtp {
         uvgrtp::frame::rtp_header rtp_common;
         uvgrtp::frame::rtp_header *rtp_headers = nullptr;
 
-#ifdef __linux__
+#ifndef _WIN32
         struct mmsghdr *headers = nullptr;
         struct iovec   *chunks = nullptr;
 #else

src/random.cc

@@ -31,10 +31,10 @@ rtp_error_t uvgrtp::random::init()
 
 int uvgrtp::random::generate(void *buf, size_t n)
 {
-#ifdef __linux__
+#ifndef _WIN32
 #ifdef HAVE_GETRANDOM
     return getrandom(buf, n, 0);
-#else // HAVE_GETRANDOM
+#else
 
     // Replace with the syscall
     int read = syscall(SYS_getrandom, buf, n, 0);
@@ -52,7 +52,7 @@ int uvgrtp::random::generate(void *buf, size_t n)
 
     return read;
 #endif // HAVE_GETRANDOM
-#else // __linux__
+#else
 
     if (n > UINT32_MAX)
     {

src/rtp.cc

@@ -4,7 +4,7 @@
 #include "debug.hh"
 #include "random.hh"
 
-#ifdef __linux__
+#ifndef _WIN32
 #include <arpa/inet.h>
 #include <unistd.h>
 #endif

src/socket.cc

@@ -33,7 +33,7 @@ uvgrtp::socket::socket(int flags):
 
 uvgrtp::socket::~socket()
 {
-#ifdef __linux__
+#ifndef _WIN32
     close(socket_);
 #else
     closesocket(socket_);
@@ -153,7 +153,7 @@ rtp_error_t uvgrtp::socket::__sendto(sockaddr_in& addr, uint8_t *buf, size_t buf
 {
     int nsend = 0;
 
-#ifdef __linux__
+#ifndef _WIN32
     if ((nsend = ::sendto(socket_, buf, buf_len, flags, (const struct sockaddr *)&addr, sizeof(addr_))) == -1) {
         LOG_ERROR("Failed to send data: %s", strerror(errno));
 
@@ -210,7 +210,7 @@ rtp_error_t uvgrtp::socket::__sendtov(
     int flags, int *bytes_sent
 )
 {
-#ifdef __linux__
+#ifndef _WIN32
     int sent_bytes = 0;
 
     for (size_t i = 0; i < buffers.size(); ++i) {
@@ -332,7 +332,7 @@ rtp_error_t uvgrtp::socket::__sendtov(
     int flags, int *bytes_sent
 )
 {
-#ifdef __linux__
+#ifndef _WIN32
     int sent_bytes = 0;
     struct mmsghdr *hptr, *headers;
 
@@ -493,7 +493,7 @@ rtp_error_t uvgrtp::socket::__recv(uint8_t *buf, size_t buf_len, int flags, int
         return RTP_INVALID_VALUE;
     }
 
-#ifdef __linux__
+#ifndef _WIN32
     int32_t ret = ::recv(socket_, buf, buf_len, flags);
 
     if (ret == -1) {
@@ -553,7 +553,7 @@ rtp_error_t uvgrtp::socket::__recvfrom(uint8_t *buf, size_t buf_len, int flags,
     if (sender)
         len_ptr = &len;
 
-#ifdef __linux__
+#ifndef _WIN32
     int32_t ret = ::recvfrom(socket_, buf, buf_len, flags, (struct sockaddr *)sender, len_ptr);
 
     if (ret == -1) {