warnings: fix code that emits compiler warnings

PR-URL: https://github.com/libuv/libuv/pull/2066
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Refael Ackermann <refack@gmail.com>

33 files changed, 129 insertions, 72 deletions

diff --git a/src/timer.c b/src/timer.c
index 2bf449a7..dd78bcba 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -152,7 +152,7 @@ int uv__next_timeout(const uv_loop_t* loop) {
   if (diff > INT_MAX)
     diff = INT_MAX;
 
-  return diff;
+  return (int) diff;
 }
 
 
diff --git a/src/unix/fs.c b/src/unix/fs.c
index a2cfc3ae..d22c70f0 100644
--- a/src/unix/fs.c
+++ b/src/unix/fs.c
@@ -71,6 +71,10 @@
 # include <utime.h>
 #endif
 
+#if defined(_AIX) && _XOPEN_SOURCE <= 600
+extern char *mkdtemp(char *template); /* See issue #740 on AIX < 7 */
+#endif
+
 #define INIT(subtype)                                                         \
   do {                                                                        \
     if (req == NULL)                                                          \
@@ -723,7 +727,7 @@ static ssize_t uv__fs_utime(uv_fs_t* req) {
   atr.att_atimechg = 1;
   atr.att_mtime = req->mtime;
   atr.att_atime = req->atime;
-  return __lchattr(req->path, &atr, sizeof(atr));
+  return __lchattr((char*) req->path, &atr, sizeof(atr));
 #else
   errno = ENOSYS;
   return -1;
diff --git a/src/unix/os390.c b/src/unix/os390.c
index b43aebfc..c86036e9 100644
--- a/src/unix/os390.c
+++ b/src/unix/os390.c
@@ -229,8 +229,8 @@ static int getexe(const int pid, char* buf, size_t len) {
   assert(((Output_buf.Output_data.offsetPath >>24) & 0xFF) == 'A');
 
   /* Get the offset from the lowest 3 bytes */
-  Output_path = (char*)(&Output_buf) +
-                (Output_buf.Output_data.offsetPath & 0x00FFFFFF);
+  Output_path = (struct Output_path_type*) ((char*) (&Output_buf) +
+      (Output_buf.Output_data.offsetPath & 0x00FFFFFF));
 
   if (Output_path->len >= len) {
     errno = ENOBUFS;
diff --git a/src/unix/sunos.c b/src/unix/sunos.c
index ec5ecd7d..2552a019 100644
--- a/src/unix/sunos.c
+++ b/src/unix/sunos.c
@@ -707,13 +707,14 @@ static int uv__set_phys_addr(uv_interface_address_t* address,
 
   struct sockaddr_dl* sa_addr;
   int sockfd;
-  int i;
+  size_t i;
   struct arpreq arpreq;
 
   /* This appears to only work as root */
   sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
   memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
   for (i = 0; i < sizeof(address->phys_addr); i++) {
+    /* Check that all bytes of phys_addr are zero. */
     if (address->phys_addr[i] != 0)
       return 0;
   }
diff --git a/src/uv-data-getter-setters.c b/src/uv-data-getter-setters.c
index 533e4a2f..b7fcd4a7 100644
--- a/src/uv-data-getter-setters.c
+++ b/src/uv-data-getter-setters.c
@@ -3,11 +3,11 @@
 const char* uv_handle_type_name(uv_handle_type type) {
   switch (type) {
 #define XX(uc,lc) case UV_##uc: return #lc;
-    UV_HANDLE_TYPE_MAP(XX)
+  UV_HANDLE_TYPE_MAP(XX)
 #undef XX
-    case UV_FILE: return "file";
-    case UV_HANDLE_TYPE_MAX:
-    case UV_UNKNOWN_HANDLE: return NULL;
+  case UV_FILE: return "file";
+  case UV_HANDLE_TYPE_MAX:
+  case UV_UNKNOWN_HANDLE: return NULL;
   }
   return NULL;
 }
@@ -31,10 +31,12 @@ void uv_handle_set_data(uv_handle_t* handle, void* data) {
 const char* uv_req_type_name(uv_req_type type) {
   switch (type) {
 #define XX(uc,lc) case UV_##uc: return #lc;
-    UV_REQ_TYPE_MAP(XX)
+  UV_REQ_TYPE_MAP(XX)
 #undef XX
-    case UV_REQ_TYPE_MAX:
-    case UV_UNKNOWN_REQ: return NULL;
+  case UV_REQ_TYPE_MAX:
+  case UV_UNKNOWN_REQ:
+  default: /* UV_REQ_TYPE_PRIVATE */
+     return NULL;
   }
   return NULL;
 }
diff --git a/src/win/dl.c b/src/win/dl.c
index 5b84555c..676be4dc 100644
--- a/src/win/dl.c
+++ b/src/win/dl.c
@@ -64,7 +64,8 @@ void uv_dlclose(uv_lib_t* lib) {
 
 
 int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
-  *ptr = (void*) GetProcAddress(lib->handle, name);
+  /* Cast though integer to suppress pedantic warning about forbidden cast. */
+  *ptr = (void*)(uintptr_t) GetProcAddress(lib->handle, name);
   return uv__dlerror(lib, "", *ptr ? 0 : GetLastError());
 }
 
@@ -75,8 +76,9 @@ const char* uv_dlerror(const uv_lib_t* lib) {
 
 
 static void uv__format_fallback_error(uv_lib_t* lib, int errorno){
-  DWORD_PTR args[1] = { (DWORD_PTR) errorno };
-  LPSTR fallback_error = "error: %1!d!";
+  static const CHAR fallback_error[] = "error: %1!d!";
+  DWORD_PTR args[1];
+  args[0] = (DWORD_PTR) errorno;
 
   FormatMessageA(FORMAT_MESSAGE_FROM_STRING |
                  FORMAT_MESSAGE_ARGUMENT_ARRAY |
diff --git a/src/win/fs-event.c b/src/win/fs-event.c
index 25809ea4..1244967a 100644
--- a/src/win/fs-event.c
+++ b/src/win/fs-event.c
@@ -215,11 +215,11 @@ int uv_fs_event_start(uv_fs_event_t* handle,
         uv__free(long_path);
         long_path = NULL;
       }
-    }
 
-    if (long_path) {
-      uv__free(pathw);
-      pathw = long_path;
+      if (long_path) {
+        uv__free(pathw);
+        pathw = long_path;
+      }
     }
 
     dir_to_watch = pathw;
diff --git a/src/win/fs.c b/src/win/fs.c
index 7ad0d077..a7dfb7c5 100644
--- a/src/win/fs.c
+++ b/src/win/fs.c
@@ -98,14 +98,17 @@
     return;                                                                 \
   }
 
+#define MILLIONu (1000U * 1000U)
+#define BILLIONu (1000U * 1000U * 1000U)
+
 #define FILETIME_TO_UINT(filetime)                                          \
-   (*((uint64_t*) &(filetime)) - 116444736000000000ULL)
+   (*((uint64_t*) &(filetime)) - (uint64_t) 116444736 * BILLIONu)
 
 #define FILETIME_TO_TIME_T(filetime)                                        \
-   (FILETIME_TO_UINT(filetime) / 10000000ULL)
+   (FILETIME_TO_UINT(filetime) / (10u * MILLIONu))
 
 #define FILETIME_TO_TIME_NS(filetime, secs)                                 \
-   ((FILETIME_TO_UINT(filetime) - (secs * 10000000ULL)) * 100)
+   ((FILETIME_TO_UINT(filetime) - (secs * (uint64_t) 10 * MILLIONu)) * 100U)
 
 #define FILETIME_TO_TIMESPEC(ts, filetime)                                  \
    do {                                                                     \
@@ -115,8 +118,8 @@
 
 #define TIME_T_TO_FILETIME(time, filetime_ptr)                              \
   do {                                                                      \
-    uint64_t bigtime = ((uint64_t) ((time) * 10000000ULL)) +                \
-                                  116444736000000000ULL;                    \
+    uint64_t bigtime = ((uint64_t) ((time) * (uint64_t) 10 * MILLIONu)) +   \
+                       (uint64_t) 116444736 * BILLIONu;                     \
     (filetime_ptr)->dwLowDateTime = bigtime & 0xFFFFFFFF;                   \
     (filetime_ptr)->dwHighDateTime = bigtime >> 32;                         \
   } while(0)
@@ -788,9 +791,8 @@ void fs__unlink(uv_fs_t* req) {
     /* Remove read-only attribute */
     FILE_BASIC_INFORMATION basic = { 0 };
 
-    basic.FileAttributes = info.dwFileAttributes
-                           & ~(FILE_ATTRIBUTE_READONLY)
-                           | FILE_ATTRIBUTE_ARCHIVE;
+    basic.FileAttributes = (info.dwFileAttributes & ~FILE_ATTRIBUTE_READONLY) |
+                           FILE_ATTRIBUTE_ARCHIVE;
 
     status = pNtSetInformationFile(handle,
                                    &iosb,
@@ -1201,7 +1203,7 @@ INLINE static int fs__stat_handle(HANDLE handle, uv_stat_t* statbuf,
 
   /* st_blocks contains the on-disk allocation size in 512-byte units. */
   statbuf->st_blocks =
-      file_info.StandardInformation.AllocationSize.QuadPart >> 9ULL;
+      (uint64_t) file_info.StandardInformation.AllocationSize.QuadPart >> 9;
 
   statbuf->st_nlink = file_info.StandardInformation.NumberOfLinks;
 
@@ -1958,7 +1960,7 @@ static void fs__readlink(uv_fs_t* req) {
 }
 
 
-static size_t fs__realpath_handle(HANDLE handle, char** realpath_ptr) {
+static ssize_t fs__realpath_handle(HANDLE handle, char** realpath_ptr) {
   int r;
   DWORD w_realpath_len;
   WCHAR* w_realpath_ptr = NULL;
diff --git a/src/win/pipe.c b/src/win/pipe.c
index 9a3cbc8a..e303cc8a 100644
--- a/src/win/pipe.c
+++ b/src/win/pipe.c
@@ -1541,7 +1541,7 @@ int uv__pipe_write_ipc(uv_loop_t* loop,
         frame_header.flags |= UV__IPC_FRAME_HAS_SOCKET_XFER;
         break;
       default:
-        assert(0);  // Unreachable.
+        assert(0);  /* Unreachable. */
     }
     /* Add xfer info buffer. */
     bufs[buf_index++] = uv_buf_init((char*) &xfer_info, sizeof xfer_info);
@@ -2141,7 +2141,7 @@ int uv_pipe_open(uv_pipe_t* pipe, uv_file file) {
   if (pipe->ipc) {
     assert(!(pipe->flags & UV_HANDLE_NON_OVERLAPPED_PIPE));
     pipe->pipe.conn.ipc_remote_pid = uv_os_getppid();
-    assert(pipe->pipe.conn.ipc_remote_pid != -1);
+    assert(pipe->pipe.conn.ipc_remote_pid != (DWORD) -1);
   }
   return 0;
 }
@@ -2312,7 +2312,7 @@ uv_handle_type uv_pipe_pending_type(uv_pipe_t* handle) {
 }
 
 int uv_pipe_chmod(uv_pipe_t* handle, int mode) {
-  SID_IDENTIFIER_AUTHORITY sid_world = SECURITY_WORLD_SID_AUTHORITY;
+  SID_IDENTIFIER_AUTHORITY sid_world = { SECURITY_WORLD_SID_AUTHORITY };
   PACL old_dacl, new_dacl;
   PSECURITY_DESCRIPTOR sd;
   EXPLICIT_ACCESS ea;
diff --git a/src/win/poll.c b/src/win/poll.c
index 77eb071c..3c667860 100644
--- a/src/win/poll.c
+++ b/src/win/poll.c
@@ -75,7 +75,7 @@ static AFD_POLL_INFO* uv__get_afd_poll_info_dummy(void) {
 static void uv__fast_poll_submit_poll_req(uv_loop_t* loop, uv_poll_t* handle) {
   uv_req_t* req;
   AFD_POLL_INFO* afd_poll_info;
-  DWORD result;
+  int result;
 
   /* Find a yet unsubmitted req to submit. */
   if (handle->submitted_events_1 == 0) {
@@ -136,7 +136,7 @@ static void uv__fast_poll_submit_poll_req(uv_loop_t* loop, uv_poll_t* handle) {
 
 static int uv__fast_poll_cancel_poll_req(uv_loop_t* loop, uv_poll_t* handle) {
   AFD_POLL_INFO afd_poll_info;
-  DWORD result;
+  int result;
 
   afd_poll_info.Exclusive = TRUE;
   afd_poll_info.NumberOfHandles = 1;
diff --git a/src/win/process.c b/src/win/process.c
index e7cccd9c..f9c53de0 100644
--- a/src/win/process.c
+++ b/src/win/process.c
@@ -739,7 +739,7 @@ int make_program_env(char* env_block[], WCHAR** dst_ptr) {
     }
   }
   *ptr_copy = NULL;
-  assert(env_len == ptr - dst_copy);
+  assert(env_len == (size_t) (ptr - dst_copy));
 
   /* sort our (UTF-16) copy */
   qsort(env_copy, env_block_count-1, sizeof(wchar_t*), qsort_wcscmp);
@@ -799,7 +799,7 @@ int make_program_env(char* env_block[], WCHAR** dst_ptr) {
         var_size = GetEnvironmentVariableW(required_vars[i].wide,
                                            ptr,
                                            (int) (env_len - (ptr - dst)));
-        if (var_size != len-1) { /* race condition? */
+        if (var_size != (DWORD) (len - 1)) { /* TODO: handle race condition? */
           uv_fatal_error(GetLastError(), "GetEnvironmentVariableW");
         }
       }
@@ -815,7 +815,7 @@ int make_program_env(char* env_block[], WCHAR** dst_ptr) {
   }
 
   /* Terminate with an extra NULL. */
-  assert(env_len == (ptr - dst));
+  assert(env_len == (size_t) (ptr - dst));
   *ptr = L'\0';
 
   uv__free(dst_copy);
diff --git a/src/win/tty.c b/src/win/tty.c
index 398288ec..45bbe968 100644
--- a/src/win/tty.c
+++ b/src/win/tty.c
@@ -791,8 +791,9 @@ void uv_process_tty_read_raw_req(uv_loop_t* loop, uv_tty_t* handle,
         if (KEV.uChar.UnicodeChar >= 0xDC00 &&
             KEV.uChar.UnicodeChar < 0xE000) {
           /* UTF-16 surrogate pair */
-          WCHAR utf16_buffer[2] = { handle->tty.rd.last_utf16_high_surrogate,
-                                    KEV.uChar.UnicodeChar};
+          WCHAR utf16_buffer[2];
+          utf16_buffer[0] = handle->tty.rd.last_utf16_high_surrogate;
+          utf16_buffer[1] = KEV.uChar.UnicodeChar;
           char_len = WideCharToMultiByte(CP_UTF8,
                                          0,
                                          utf16_buffer,
diff --git a/src/win/winapi.h b/src/win/winapi.h
index cfbac52e..2a8adf6b 100644
--- a/src/win/winapi.h
+++ b/src/win/winapi.h
@@ -4109,6 +4109,9 @@
 #endif
 
 /* from winternl.h */
+#if !defined(__UNICODE_STRING_DEFINED) && defined(__MINGW32_)
+#define __UNICODE_STRING_DEFINED
+#endif
 typedef struct _UNICODE_STRING {
   USHORT Length;
   USHORT MaximumLength;
diff --git a/test/run-tests.c b/test/run-tests.c
index 42bde0bb..2a699f46 100644
--- a/test/run-tests.c
+++ b/test/run-tests.c
@@ -142,11 +142,11 @@ static int maybe_run_test(int argc, char **argv) {
   if (strcmp(argv[1], "spawn_helper5") == 0) {
     const char out[] = "fourth stdio!\n";
     notify_parent_process();
+    {
 #ifdef _WIN32
-    DWORD bytes;
-    WriteFile((HANDLE) _get_osfhandle(3), out, sizeof(out) - 1, &bytes, NULL);
+      DWORD bytes;
+      WriteFile((HANDLE) _get_osfhandle(3), out, sizeof(out) - 1, &bytes, NULL);
 #else
-    {
       ssize_t r;
 
       do
@@ -154,8 +154,8 @@ static int maybe_run_test(int argc, char **argv) {
       while (r == -1 && errno == EINTR);
 
       fsync(3);
-    }
 #endif
+    }
     return 1;
   }
 
diff --git a/test/runner-win.c b/test/runner-win.c
index e3e91a7b..f60c23df 100644
--- a/test/runner-win.c
+++ b/test/runner-win.c
@@ -194,7 +194,7 @@ int process_wait(process_info_t *vec, int n, int timeout) {
 
   result = WaitForMultipleObjects(n, handles, TRUE, timeout_api);
 
-  if (result >= WAIT_OBJECT_0 && result < WAIT_OBJECT_0 + n) {
+  if (result < WAIT_OBJECT_0 + n) {
     /* All processes are terminated. */
     return 0;
   }
@@ -268,7 +268,8 @@ int process_read_last_line(process_info_t *p,
   if (!ReadFile(p->stdio_out, buffer, buffer_len - 1, &read, &overlapped))
     return -1;
 
-  for (start = read - 1; start >= 0; start--) {
+  start = read;
+  while (start-- > 0) {
     if (buffer[start] == '\n' || buffer[start] == '\r')
       break;
   }
@@ -308,7 +309,7 @@ void process_cleanup(process_info_t *p) {
 }
 
 
-static int clear_line() {
+static int clear_line(void) {
   HANDLE handle;
   CONSOLE_SCREEN_BUFFER_INFO info;
   COORD coord;
diff --git a/test/runner-win.h b/test/runner-win.h
index 8cc4c16e..975eed79 100644
--- a/test/runner-win.h
+++ b/test/runner-win.h
@@ -20,7 +20,9 @@
  */
 
 /* Don't complain about write(), fileno() etc. being deprecated. */
+#ifdef _MSC_VER
 #pragma warning(disable : 4996)
+#endif
 
 
 #include <winsock2.h>
diff --git a/test/test-close-fd.c b/test/test-close-fd.c
index 93a7bd7c..2ed9a100 100644
--- a/test/test-close-fd.c
+++ b/test/test-close-fd.c
@@ -73,4 +73,8 @@ TEST_IMPL(close_fd) {
   return 0;
 }
 
-#endif  /* !defined(_WIN32) */
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
+#endif /* !_WIN32 */
diff --git a/test/test-condvar.c b/test/test-condvar.c
index 50f3c047..32abccc2 100644
--- a/test/test-condvar.c
+++ b/test/test-condvar.c
@@ -235,7 +235,7 @@ TEST_IMPL(condvar_5) {
   uint64_t elapsed;
   uint64_t timeout;
 
-  timeout = 100 * 1e6; /* 100 ms in ns */
+  timeout = 100 * 1000 * 1000; /* 100 ms in ns */
 
   /* Mostly irrelevant. We need cond and mutex initialized. */
   worker_config_init(&wc, 0, NULL, NULL);
diff --git a/test/test-emfile.c b/test/test-emfile.c
index 8e44ac5c..bc1fce5f 100644
--- a/test/test-emfile.c
+++ b/test/test-emfile.c
@@ -38,6 +38,11 @@ static uv_tcp_t client_handle;
 
 
 TEST_IMPL(emfile) {
+  struct sockaddr_in addr;
+  struct rlimit limits;
+  uv_connect_t connect_req;
+  uv_loop_t* loop;
+  int first_fd;
 #if defined(_AIX) || defined(__MVS__)
   /* On AIX, if a 'accept' call fails ECONNRESET is set on the socket
    * which causes uv__emfile_trick to not work as intended and this test
@@ -45,11 +50,6 @@ TEST_IMPL(emfile) {
    */
   RETURN_SKIP("uv__emfile_trick does not work on this OS");
 #endif
-  struct sockaddr_in addr;
-  struct rlimit limits;
-  uv_connect_t connect_req;
-  uv_loop_t* loop;
-  int first_fd;
 
   /* Lower the file descriptor limit and use up all fds save one. */
   limits.rlim_cur = limits.rlim_max = maxfd + 1;
@@ -114,4 +114,8 @@ static void connect_cb(uv_connect_t* req, int status) {
   uv_close((uv_handle_t*) &client_handle, NULL);
 }
 
-#endif  /* !defined(_WIN32) */
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
+#endif /* !_WIN32 */
diff --git a/test/test-fork.c b/test/test-fork.c
index f47ae3e6..9e4684f0 100644
--- a/test/test-fork.c
+++ b/test/test-fork.c
@@ -676,5 +676,8 @@ TEST_IMPL(fork_threadpool_queue_work_simple) {
 }
 #endif /* !__MVS__ */
 
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
 
 #endif /* !_WIN32 */
diff --git a/test/test-fs.c b/test/test-fs.c
index 038d2dd6..5530b3c8 100644
--- a/test/test-fs.c
+++ b/test/test-fs.c
@@ -154,7 +154,7 @@ int uv_test_getiovmax(void) {
 static unsigned REPARSE_TAG = 0x9913;
 static GUID REPARSE_GUID = {
   0x1bf6205f, 0x46ae, 0x4527,
-  0xb1, 0x0c, 0xc5, 0x09, 0xb7, 0x55, 0x22, 0x80 };
+  { 0xb1, 0x0c, 0xc5, 0x09, 0xb7, 0x55, 0x22, 0x80 }};
 #endif
 
 static void check_permission(const char* filename, unsigned int mode) {
@@ -2331,9 +2331,6 @@ TEST_IMPL(fs_stat_root) {
 
 
 TEST_IMPL(fs_futime) {
-#if defined(_AIX) && !defined(_AIX71)
-  RETURN_SKIP("futime is not implemented for AIX versions below 7.1");
-#else
   utime_check_t checkme;
   const char* path = "test_file";
   double atime;
@@ -2341,6 +2338,9 @@ TEST_IMPL(fs_futime) {
   uv_file file;
   uv_fs_t req;
   int r;
+#if defined(_AIX) && !defined(_AIX71)
+  RETURN_SKIP("futime is not implemented for AIX versions below 7.1");
+#endif
 
   /* Setup. */
   loop = uv_default_loop();
@@ -2402,7 +2402,6 @@ TEST_IMPL(fs_futime) {
 
   MAKE_VALGRIND_HAPPY();
   return 0;
-#endif
 }
 
 
diff --git a/test/test-ip6-addr.c b/test/test-ip6-addr.c
index 25570dca..bbf33a48 100644
--- a/test/test-ip6-addr.c
+++ b/test/test-ip6-addr.c
@@ -83,7 +83,7 @@ TEST_IMPL(ip6_addr_link_local) {
     ASSERT(0 == r);
 #ifdef _WIN32
     /* On Windows, the interface identifier is the numeric string of the index. */
-    ASSERT(strtol(interface_id, NULL, 10) == iface_index);
+    ASSERT(strtoul(interface_id, NULL, 10) == iface_index);
 #else
     /* On Unix/Linux, the interface identifier is the interface device name. */
     ASSERT(0 == strcmp(device_name, interface_id));
diff --git a/test/test-pipe-close-stdout-read-stdin.c b/test/test-pipe-close-stdout-read-stdin.c
index c8804b0e..126be2cc 100644
--- a/test/test-pipe-close-stdout-read-stdin.c
+++ b/test/test-pipe-close-stdout-read-stdin.c
@@ -105,4 +105,8 @@ TEST_IMPL(pipe_close_stdout_read_stdin) {
   return 0;
 }
 
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
 #endif /* ifndef _WIN32 */
diff --git a/test/test-poll-close-doesnt-corrupt-stack.c b/test/test-poll-close-doesnt-corrupt-stack.c
index 1dfc80e3..3393820f 100644
--- a/test/test-poll-close-doesnt-corrupt-stack.c
+++ b/test/test-poll-close-doesnt-corrupt-stack.c
@@ -49,7 +49,7 @@ static void poll_cb(uv_poll_t* h, int status, int events) {
 }
 
 
-static void NO_INLINE close_socket_and_verify_stack() {
+static void NO_INLINE close_socket_and_verify_stack(void) {
   const uint32_t MARKER = 0xDEADBEEF;
   const int VERIFY_AFTER = 10; /* ms */
   int r;
diff --git a/test/test-poll-oob.c b/test/test-poll-oob.c
index 2a6da843..77ffe31e 100644
--- a/test/test-poll-oob.c
+++ b/test/test-poll-oob.c
@@ -202,4 +202,9 @@ TEST_IMPL(poll_oob) {
   MAKE_VALGRIND_HAPPY();
   return 0;
 }
+
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
 #endif
diff --git a/test/test-process-title-threadsafe.c b/test/test-process-title-threadsafe.c
index c0dee48a..19098eda 100644
--- a/test/test-process-title-threadsafe.c
+++ b/test/test-process-title-threadsafe.c
@@ -70,7 +70,7 @@ TEST_IMPL(process_title_threadsafe) {
 #if defined(__sun) || defined(__CYGWIN__) || defined(__MSYS__) || \
     defined(__MVS__)
   RETURN_SKIP("uv_(get|set)_process_title is not implemented.");
-#else
+#endif
 
   ASSERT(0 == uv_set_process_title(titles[0]));
   ASSERT(0 == uv_thread_create(&getter_thread, getter_thread_body, NULL));
@@ -82,5 +82,4 @@ TEST_IMPL(process_title_threadsafe) {
     ASSERT(0 == uv_thread_join(&setter_threads[i]));
 
   return 0;
-#endif
 }
diff --git a/test/test-process-title.c b/test/test-process-title.c
index 886f83a7..efd48142 100644
--- a/test/test-process-title.c
+++ b/test/test-process-title.c
@@ -62,7 +62,8 @@ static void uv_get_process_title_edge_cases(void) {
 TEST_IMPL(process_title) {
 #if defined(__sun) || defined(__CYGWIN__) || defined(__MSYS__)
   RETURN_SKIP("uv_(get|set)_process_title is not implemented.");
-#else
+#endif
+
   /* Check for format string vulnerabilities. */
   set_title("%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s");
   set_title("new title");
@@ -71,5 +72,4 @@ TEST_IMPL(process_title) {
   uv_get_process_title_edge_cases();
 
   return 0;
-#endif
 }
diff --git a/test/test-signal-multiple-loops.c b/test/test-signal-multiple-loops.c
index 79242fc9..4281d23d 100644
--- a/test/test-signal-multiple-loops.c
+++ b/test/test-signal-multiple-loops.c
@@ -295,4 +295,8 @@ TEST_IMPL(signal_multiple_loops) {
   return 0;
 }
 
-#endif  /* !_WIN32 */
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
+#endif /* !_WIN32 */
diff --git a/test/test-spawn.c b/test/test-spawn.c
index 594a64c6..05c76f61 100644
--- a/test/test-spawn.c
+++ b/test/test-spawn.c
@@ -49,7 +49,9 @@ static char exepath[1024];
 static size_t exepath_size = 1024;
 static char* args[5];
 static int no_term_signal;
+#ifndef _WIN32
 static int timer_counter;
+#endif
 static uv_tcp_t tcp_server;
 
 #define OUTPUT_SIZE 1024
@@ -138,10 +140,12 @@ static void on_read(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
 }
 
 
+#ifndef _WIN32
 static void on_read_once(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
   uv_read_stop(tcp);
   on_read(tcp, nread, buf);
 }
+#endif
 
 
 static void write_cb(uv_write_t* req, int status) {
@@ -173,9 +177,11 @@ static void timer_cb(uv_timer_t* handle) {
 }
 
 
+#ifndef _WIN32
 static void timer_counter_cb(uv_timer_t* handle) {
   ++timer_counter;
 }
+#endif
 
 
 TEST_IMPL(spawn_fails) {
@@ -1198,7 +1204,7 @@ TEST_IMPL(argument_escaping) {
 int make_program_env(char** env_block, WCHAR** dst_ptr);
 
 TEST_IMPL(environment_creation) {
-  int i;
+  size_t i;
   char* environment[] = {
     "FOO=BAR",
     "SYSTEM=ROOT", /* substring of a supplied var name */
diff --git a/test/test-tcp-close-accept.c b/test/test-tcp-close-accept.c
index e4878398..624262bc 100644
--- a/test/test-tcp-close-accept.c
+++ b/test/test-tcp-close-accept.c
@@ -191,4 +191,8 @@ TEST_IMPL(tcp_close_accept) {
   return 0;
 }
 
-#endif  /* !_WIN32 */
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
+#endif /* !_WIN32 */
diff --git a/test/test-tcp-oob.c b/test/test-tcp-oob.c
index ca2361f9..53f8231e 100644
--- a/test/test-tcp-oob.c
+++ b/test/test-tcp-oob.c
@@ -138,4 +138,9 @@ TEST_IMPL(tcp_oob) {
   MAKE_VALGRIND_HAPPY();
   return 0;
 }
-#endif
+
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
+#endif /* !_WIN32 */
diff --git a/test/test-tcp-write-after-connect.c b/test/test-tcp-write-after-connect.c
index aa03228f..8198e7e1 100644
--- a/test/test-tcp-write-after-connect.c
+++ b/test/test-tcp-write-after-connect.c
@@ -65,4 +65,8 @@ TEST_IMPL(tcp_write_after_connect) {
   return 0;
 }
 
-#endif
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
+#endif /* !_WIN32 */
diff --git a/test/test-tty.c b/test/test-tty.c
index 979a6ec3..688711e5 100644
--- a/test/test-tty.c
+++ b/test/test-tty.c
@@ -315,10 +315,8 @@ TEST_IMPL(tty_raw_cancel) {
   int r;
   int ttyin_fd;
   uv_tty_t tty_in;
-  uv_loop_t* loop;
   HANDLE handle;
 
-  loop = uv_default_loop();
   /* Make sure we have an FD that refers to a tty */
   handle = CreateFileA("conin$",
                        GENERIC_READ | GENERIC_WRITE,