Fix compilation warnings in MinGW64 build using GCC 7

Reported by Richard Copley <rcopley@gmail.com>.
* src/w32heap.c (init_heap): Declare enable_lfh only for
mingw.org's MinGW build.

* src/w32console.c (w32con_write_glyphs):
* src/unexw32.c (get_section_info, COPY_CHUNK, unexec): Fix some
mismatches of data type vs format spec.

* src/w32fns.c (compute_tip_xy):
* src/w32proc.c (stop_timer_thread):
* src/w32notify.c (remove_watch):
* src/eval.c (internal_lisp_condition_case):
* src/editfns.c (Ftranslate_region_internal):
* src/data.c (Fmake_variable_buffer_local, cons_to_unsigned)
(cons_to_signed):
* src/buffer.c (fix_overlays_before): Initialize variables to
avoid compiler warnings.

* lib-src/etags.c (TeX_commands, process_file_name): Initialize
variables to avoid compilation warnings.

10 files changed, 17 insertions, 16 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 2d508f35cf6..0827e9ba445 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -3764,7 +3764,7 @@ fix_overlays_before (struct buffer *bp, ptrdiff_t prev, ptrdiff_t pos)
   /* If parent is nil, replace overlays_before; otherwise, parent->next.  */
   struct Lisp_Overlay *tail = bp->overlays_before, *parent = NULL, *right_pair;
   Lisp_Object tem;
-  ptrdiff_t end;
+  ptrdiff_t end = prev;
 
   /* After the insertion, the several overlays may be in incorrect
      order.  The possibility is that, in the list `overlays_before',
diff --git a/src/data.c b/src/data.c
index 559844b03fd..87010e3fb28 100644
--- a/src/data.c
+++ b/src/data.c
@@ -1823,7 +1823,7 @@ The function `default-value' gets the default value and `set-default' sets it.
   struct Lisp_Symbol *sym;
   struct Lisp_Buffer_Local_Value *blv = NULL;
   union Lisp_Val_Fwd valcontents;
-  bool forwarded;
+  bool forwarded = false;
 
   CHECK_SYMBOL (variable);
   sym = XSYMBOL (variable);
@@ -2607,7 +2607,7 @@ uintmax_t
 cons_to_unsigned (Lisp_Object c, uintmax_t max)
 {
   bool valid = false;
-  uintmax_t val;
+  uintmax_t val = max;
   if (INTEGERP (c))
     {
       valid = XINT (c) >= 0;
@@ -2661,7 +2661,7 @@ intmax_t
 cons_to_signed (Lisp_Object c, intmax_t min, intmax_t max)
 {
   bool valid = false;
-  intmax_t val;
+  intmax_t val = max;
   if (INTEGERP (c))
     {
       val = XINT (c);
diff --git a/src/editfns.c b/src/editfns.c
index d599fcfec80..95f35549e4e 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -3613,7 +3613,7 @@ It returns the number of characters changed.  */)
   for (; pos < end_pos; )
     {
       register unsigned char *p = BYTE_POS_ADDR (pos_byte);
-      unsigned char *str, buf[MAX_MULTIBYTE_LENGTH];
+      unsigned char *str = tt, buf[MAX_MULTIBYTE_LENGTH];
       int len, str_len;
       int oc;
       Lisp_Object val;
diff --git a/src/eval.c b/src/eval.c
index e3e7d8e26b2..c2cd6c60ea4 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1226,7 +1226,7 @@ internal_lisp_condition_case (Lisp_Object var, Lisp_Object bodyform,
                               Lisp_Object handlers)
 {
   struct handler *oldhandlerlist = handlerlist;
-  ptrdiff_t clausenb = 0;
+  volatile ptrdiff_t clausenb = 0;
 
   CHECK_SYMBOL (var);
 
diff --git a/src/unexw32.c b/src/unexw32.c
index 904447c3ec9..5259b2a52b0 100644
--- a/src/unexw32.c
+++ b/src/unexw32.c
@@ -357,7 +357,7 @@ get_section_info (file_data *p_infile)
   /* Check the NT header signature ...  */
   if (nt_header->Signature != IMAGE_NT_SIGNATURE)
     {
-      printf ("Invalid IMAGE_NT_SIGNATURE 0x%x in %s...bailing.\n",
+      printf ("Invalid IMAGE_NT_SIGNATURE 0x%lx in %s...bailing.\n",
               nt_header->Signature, p_infile->name);
       exit (1);
     }
@@ -496,7 +496,7 @@ copy_executable_and_dump_data (file_data *p_infile,
         printf ("%s\n", (message));                                             \
         printf ("\t0x%08x Offset in input file.\n", s - p_infile->file_base);   \
         printf ("\t0x%08x Offset in output file.\n", dst - p_outfile->file_base); \
-        printf ("\t0x%08x Size in bytes.\n", count);                            \
+        printf ("\t0x%08lx Size in bytes.\n", count);                           \
       }                                                                         \
     memcpy (dst, s, count);                                                     \
     dst += count;                                                               \
@@ -739,7 +739,7 @@ unexec (const char *new_name, const char *old_name)
   /* Open the undumped executable file.  */
   if (!open_input_file (&in_file, in_filename))
     {
-      printf ("Failed to open %s (%d)...bailing.\n",
+      printf ("Failed to open %s (%lu)...bailing.\n",
               in_filename, GetLastError ());
       exit (1);
     }
@@ -754,7 +754,7 @@ unexec (const char *new_name, const char *old_name)
     extra_bss_size_static;
   if (!open_output_file (&out_file, out_filename, size))
     {
-      printf ("Failed to open %s (%d)...bailing.\n",
+      printf ("Failed to open %s (%lu)...bailing.\n",
               out_filename, GetLastError ());
       exit (1);
     }
diff --git a/src/w32console.c b/src/w32console.c
index 8df6379d407..a4c089fa964 100644
--- a/src/w32console.c
+++ b/src/w32console.c
@@ -333,7 +333,7 @@ w32con_write_glyphs (struct frame *f, register struct glyph *string,
                                            coding->produced, cursor_coords,
                                            &r))
             {
-              printf ("Failed writing console attributes: %d\n",
+              printf ("Failed writing console attributes: %lu\n",
                       GetLastError ());
               fflush (stdout);
             }
@@ -343,7 +343,7 @@ w32con_write_glyphs (struct frame *f, register struct glyph *string,
                                             coding->produced, cursor_coords,
                                             &r))
             {
-              printf ("Failed writing console characters: %d\n",
+              printf ("Failed writing console characters: %lu\n",
                       GetLastError ());
               fflush (stdout);
             }
diff --git a/src/w32fns.c b/src/w32fns.c
index bf3c1d5d303..60682ae3a1a 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -4413,7 +4413,6 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
           TranslateMessage (&windows_msg);
           goto dflt;
         }
-
       /* Fall through */
 
     case WM_SYSCHAR:
@@ -7171,7 +7170,7 @@ compute_tip_xy (struct frame *f,
                 int width, int height, int *root_x, int *root_y)
 {
   Lisp_Object left, top, right, bottom;
-  int min_x = 0, min_y, max_x = 0, max_y;
+  int min_x = 0, min_y = 0, max_x = 0, max_y = 0;
 
   /* User-specified position?  */
   left = Fcdr (Fassq (Qleft, parms));
diff --git a/src/w32heap.c b/src/w32heap.c
index 54de9617494..cd1324cc867 100644
--- a/src/w32heap.c
+++ b/src/w32heap.c
@@ -228,7 +228,9 @@ init_heap (void)
 {
   if (using_dynamic_heap)
     {
+#ifndef MINGW_W64
       unsigned long enable_lfh = 2;
+#endif
 
       /* After dumping, use a new private heap.  We explicitly enable
          the low fragmentation heap (LFH) here, for the sake of pre
diff --git a/src/w32notify.c b/src/w32notify.c
index e8bdef8bdd3..7987d9f6562 100644
--- a/src/w32notify.c
+++ b/src/w32notify.c
@@ -423,7 +423,7 @@ remove_watch (struct notification *dirwatch)
     {
       int i;
       BOOL status;
-      DWORD exit_code = 0, err;
+      DWORD exit_code = 0, err = 0;
 
       /* Only the thread that issued the outstanding I/O call can call
          CancelIo on it.  (CancelIoEx is available only since Vista.)
diff --git a/src/w32proc.c b/src/w32proc.c
index 085995df58a..4459ebe324b 100644
--- a/src/w32proc.c
+++ b/src/w32proc.c
@@ -485,7 +485,7 @@ stop_timer_thread (int which)
   struct itimer_data *itimer =
     (which == ITIMER_REAL) ? &real_itimer : &prof_itimer;
   int i;
-  DWORD err, exit_code = 255;
+  DWORD err = 0, exit_code = 255;
   BOOL status;
 
   /* Signal the thread that it should terminate.  */