[PATCH][gdb] Fix s390x -m31 build

[Tom de Vries <tdevries at suse dot de>]

Hi,

When building gdb on s390x with -m31, we run into this Wformat
warning (which Werror turns into an error):
...
gdb/dwarf2read.c: In function \
  'void create_addrmap_from_aranges(dwarf2_per_objfile*, \
                                    dwarf2_section_info*)':
gdb/dwarf2read.c:3277:22: error: format '%zu' expects argument of type \
  'size_t', but argument 3 has type 'int' [-Werror=format=]
    warning (_("Section .debug_aranges in %s entry at offset %zu "
...

The Wformat warning is triggered in this statement:
...
          warning (_("Section .debug_aranges in %s entry at offset %zu "
                     "length %s exceeds section length %s, "
                     "ignoring .debug_aranges."),
                   objfile_name (objfile), entry_addr - section->buffer,
                   plongest (bytes_read + entry_length),
                   pulongest (section->size));
...
where 'entry_addr - section->buffer' is of type ptrdiff_t and '%zu' prints an
unsigned with the same size as size_t/ssize_t.

On s390x with -m31, we have:
- size_t   : unsigned long int (32-bit)
- ptrdiff_t: int               (32-bit)

Wformat warns against this because even though long int and int have the same
size, the types are not compatible.

[ The Wformat warning is to similar to what we would get for x86_64 -m32
(where long and int are also the same size) and:
...
int i;
printf ("%ld", i);
... ]

Fix this by changing the length modifier from 'z' to the ptrdiff_t length
modifier 't', and change the conversion specifier from 'u' to the more
appropriate 'd'.

Build and reg-tested on x86_64.
Build on s390x-linux with -m31.

OK for trunk?

Thanks,
- Tom

[gdb] Fix s390x -m31 build

gdb/ChangeLog:

2019-06-20  Tom de Vries  <tdevries@suse.de>

	* dwarf2read.c (create_addrmap_from_aranges)
	(read_debug_names_from_section): Print ptrdiff_t using '%td' instead
	of '%zu'.

---
 gdb/dwarf2read.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 9cf513b582..0fcd0defce 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -3246,7 +3246,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
       const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
       if (addr + entry_length > section->buffer + section->size)
 	{
-	  warning (_("Section .debug_aranges in %s entry at offset %zu "
+	  warning (_("Section .debug_aranges in %s entry at offset %td "
 	             "length %s exceeds section length %s, "
 		     "ignoring .debug_aranges."),
 		   objfile_name (objfile), entry_addr - section->buffer,
@@ -3260,7 +3260,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
       addr += 2;
       if (version != 2)
 	{
-	  warning (_("Section .debug_aranges in %s entry at offset %zu "
+	  warning (_("Section .debug_aranges in %s entry at offset %tu "
 		     "has unsupported version %d, ignoring .debug_aranges."),
 		   objfile_name (objfile), entry_addr - section->buffer,
 		   version);
@@ -3274,7 +3274,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
 	= debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
       if (per_cu_it == debug_info_offset_to_per_cu.cend ())
 	{
-	  warning (_("Section .debug_aranges in %s entry at offset %zu "
+	  warning (_("Section .debug_aranges in %s entry at offset %tu "
 		     "debug_info_offset %s does not exists, "
 		     "ignoring .debug_aranges."),
 		   objfile_name (objfile), entry_addr - section->buffer,
@@ -3286,7 +3286,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
       const uint8_t address_size = *addr++;
       if (address_size < 1 || address_size > 8)
 	{
-	  warning (_("Section .debug_aranges in %s entry at offset %zu "
+	  warning (_("Section .debug_aranges in %s entry at offset %tu "
 		     "address_size %u is invalid, ignoring .debug_aranges."),
 		   objfile_name (objfile), entry_addr - section->buffer,
 		   address_size);
@@ -3296,7 +3296,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
       const uint8_t segment_selector_size = *addr++;
       if (segment_selector_size != 0)
 	{
-	  warning (_("Section .debug_aranges in %s entry at offset %zu "
+	  warning (_("Section .debug_aranges in %s entry at offset %tu "
 		     "segment_selector_size %u is not supported, "
 		     "ignoring .debug_aranges."),
 		   objfile_name (objfile), entry_addr - section->buffer,
@@ -3312,7 +3312,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
            padding > 0; padding--)
 	if (*addr++ != 0)
 	  {
-	    warning (_("Section .debug_aranges in %s entry at offset %zu "
+	    warning (_("Section .debug_aranges in %s entry at offset %tu "
 		       "padding is not zero, ignoring .debug_aranges."),
 		     objfile_name (objfile), entry_addr - section->buffer);
 	    return;
@@ -3322,7 +3322,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
 	{
 	  if (addr + 2 * address_size > entry_end)
 	    {
-	      warning (_("Section .debug_aranges in %s entry at offset %zu "
+	      warning (_("Section .debug_aranges in %s entry at offset %tu "
 			 "address list is not properly terminated, "
 			 "ignoring .debug_aranges."),
 		       objfile_name (objfile), entry_addr - section->buffer);
@@ -5537,7 +5537,7 @@ read_debug_names_from_section (struct objfile *objfile,
   if (addr != abbrev_table_start + abbrev_table_size)
     {
       warning (_("Section .debug_names in %s has abbreviation_table "
-                 "of size %zu vs. written as %u, ignoring .debug_names."),
+		 "of size %tu vs. written as %u, ignoring .debug_names."),
 	       filename, addr - abbrev_table_start, abbrev_table_size);
       return false;
     }