[Bug c/63301] New: inconsistency on wchar_t and wint_t types and sizes for diverse architectures

[marcos.diaz at tallertechnologies dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63301

            Bug ID: 63301
           Summary: inconsistency on wchar_t and wint_t types and sizes
                    for diverse architectures
           Product: gcc
           Version: 4.8.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marcos.diaz at tallertechnologies dot com

Created attachment 33514
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33514&action=edit
Test to print wchar_t

At compiling the attached file with the following command:
sparc-rtems4.11-gcc testw_char.c -Wall -Wextra -c

The following warning appeared:

testw_char.c: In function 'main':
testw_char.c:6:2: warning: format '%lc' expects argument of type 'wint_t', but
argument 2 has type 'wchar_t' [-Wformat=]
  printf("%lc", wc);
  ^
testw_char.c:6:2: warning: format '%lc' expects argument of type 'wint_t', but
argument 2 has type 'wchar_t' [-Wformat=]

But if we compile the same file with, for example, arm-rtems4.11-gcc we get no
warning.

At further investigation we saw that the types of the wint_t and wchar_t for
this architecture were different:

 sparc-rtems4.11-gcc testw_char.c -Wall -Wextra -c -E

The output is as follows:
...
typedef long int wchar_t;
typedef unsigned int wint_t;
...

(Note that the type of wchar_t is larger than of wint_t)

With help from Joel Sherrill in RTEMS we could see that those architectures
that issue the warning have inconsistency in the types of wint_t and wchar_t,
and the others dont:

=== arm-rtems4.11-gcc - no warning

typedef unsigned int wchar_t;
typedef unsigned int wint_t;

(this has no warnings).

These are the others that Joel detected with the inconsistency:

=== m68k-rtems4.11-gcc

typedef long int wchar_t;
typedef unsigned int wint_t;

=== m32c-rtems4.11-gcc - warning

typedef long int wchar_t;
typedef unsigned int wint_t;

=== powerpc-rtems4.11-gcc - warning

typedef long int wchar_t;
typedef unsigned int wint_t;

=== sh-rtems4.11-gcc - warning

typedef long int wchar_t;
typedef unsigned int wint_t;

=== sparc-rtems4.11-gcc - warning

typedef long int wchar_t;
typedef unsigned int wint_t;

=== v850-rtems4.11-gcc - warning

typedef long int wchar_t;
typedef unsigned int wint_t;


The configuration for sparc-rtems4.11-gcc: (the others are similar)

Using built-in specs.
COLLECT_GCC=sparc-rtems4.11-gcc
COLLECT_LTO_WRAPPER=/home/marcos/Desktop/WcharRTEMS/ins-gcc/libexec/gcc/sparc-rtems4.11/4.8.3/lto-wrapper
Target: sparc-rtems4.11
Configured with: ../gcc-4.8.3/configure --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=sparc-rtems4.11 --disable-libstdcxx-pch
--with-gnu-as --with-gnu-ld --verbose --with-newlib --with-system-zlib
--disable-nls --without-included-gettext --disable-win32-registry
--enable-version-specific-runtime-libs --disable-lto
--enable-newlib-io-c99-formats --enable-newlib-iconv
--enable-newlib-iconv-encodings=big5,cp775,cp850,cp852,cp855,cp866,euc_jp,euc_kr,euc_tw,iso_8859_1,iso_8859_10,iso_8859_11,iso_8859_13,iso_8859_14,iso_8859_15,iso_8859_2,iso_8859_3,iso_8859_4,iso_8859_5,iso_8859_6,iso_8859_7,iso_8859_8,iso_8859_9,iso_ir_111,koi8_r,koi8_ru,koi8_u,koi8_uni,ucs_2,ucs_2_internal,ucs_2be,ucs_2le,ucs_4,ucs_4_internal,ucs_4be,ucs_4le,us_ascii,utf_16,utf_16be,utf_16le,utf_8,win_1250,win_1251,win_1252,win_1253,win_1254,win_1255,win_1256,win_1257,win_1258
--enable-threads --disable-plugin --enable-languages=c,c++