Fix lldb-vscode builds on Windows targeting POSIX

@stella.stamenova found out that lldb-vscode's Win32 macros were failing
when building on windows targetings POSIX platforms.

I'm changing these macros for LLVM_ON_UNIX, which should be more
accurate.

lldb/tools/lldb-vscode/IOStream.cpp

@@ -8,7 +8,7 @@
 
 #include "IOStream.h"
 
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
 #include <io.h>
 #else
 #include <netinet/in.h>
@@ -33,7 +33,7 @@ StreamDescriptor::~StreamDescriptor() {
     return;
 
   if (m_is_socket)
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
     ::closesocket(m_socket);
 #else
     ::close(m_socket);
@@ -108,7 +108,7 @@ bool InputStream::read_full(std::ofstream *log, size_t length,
     }
     if (bytes_read < 0) {
       int reason = 0;
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
       if (descriptor.m_is_socket)
         reason = WSAGetLastError();
       else

lldb/tools/lldb-vscode/IOStream.h

@@ -9,7 +9,9 @@
 #ifndef LLDB_TOOLS_LLDB_VSCODE_IOSTREAM_H
 #define LLDB_TOOLS_LLDB_VSCODE_IOSTREAM_H
 
-#if defined(_WIN32)
+#include "llvm/Config/llvm-config.h" // for LLVM_ON_UNIX
+
+#if !LLVM_ON_UNIX
 // We need to #define NOMINMAX in order to skip `min()` and `max()` macro
 // definitions that conflict with other system headers.
 // We also need to #undef GetObject (which is defined to GetObjectW) because

lldb/tools/lldb-vscode/RunInTerminal.cpp

@@ -6,7 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if !defined(WIN32)
+#include "RunInTerminal.h"
+
+#if LLVM_ON_UNIX
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -21,8 +23,6 @@
 
 #include "lldb/lldb-defines.h"
 
-#include "RunInTerminal.h"
-
 using namespace llvm;
 
 namespace lldb_vscode {

lldb/tools/lldb-vscode/VSCode.cpp

@@ -14,7 +14,7 @@
 #include "VSCode.h"
 #include "llvm/Support/FormatVariadic.h"
 
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
 #define NOMINMAX
 #include <fcntl.h>
 #include <io.h>
@@ -41,7 +41,7 @@ VSCode::VSCode()
       stop_at_entry(false), is_attach(false),
       reverse_request_seq(0), waiting_for_run_in_terminal(false) {
   const char *log_file_path = getenv("LLDBVSCODE_LOG");
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
   // Windows opens stdout and stdin in text mode which converts \n to 13,10
   // while the value is just 10 on Darwin/Linux. Setting the file mode to binary
   // fixes this.

lldb/tools/lldb-vscode/VSCode.h

@@ -9,6 +9,8 @@
 #ifndef LLDB_TOOLS_LLDB_VSCODE_VSCODE_H
 #define LLDB_TOOLS_LLDB_VSCODE_VSCODE_H
 
+#include "llvm/Config/llvm-config.h" // for LLVM_ON_UNIX
+
 #include <condition_variable>
 #include <iosfwd>
 #include <map>

lldb/tools/lldb-vscode/lldb-vscode.cpp

@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "VSCode.h"
+
 #include <assert.h>
 #include <limits.h>
 #include <stdarg.h>
@@ -14,7 +16,7 @@
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
 // We need to #define NOMINMAX in order to skip `min()` and `max()` macro
 // definitions that conflict with other system headers.
 // We also need to #undef GetObject (which is defined to GetObjectW) because
@@ -52,9 +54,8 @@
 
 #include "JSONUtils.h"
 #include "LLDBUtils.h"
-#include "VSCode.h"
 
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
 #ifndef PATH_MAX
 #define PATH_MAX MAX_PATH
 #endif
@@ -131,7 +132,7 @@ SOCKET AcceptConnection(int portno) {
           *g_vsc.log << "error: accept (" << strerror(errno) << ")"
                      << std::endl;
     }
-#if defined(_WIN32)
+#if !LLVM_ON_UNIX
     closesocket(sockfd);
 #else
     close(sockfd);
@@ -3084,7 +3085,7 @@ int main(int argc, char *argv[]) {
     }
   }
 
-#if !defined(_WIN32)
+#if LLVM_ON_UNIX
   if (input_args.hasArg(OPT_wait_for_debugger)) {
     printf("Paused waiting for debugger to attach (pid = %i)...\n", getpid());
     pause();