The problem described below was found when building the latest pretest
of wget2 with mingw.org's MinGW system headers and libraries.
Compilation of utimens.c fails thusly:
In file included from ./sys/stat.h:47:0,
from ./fcntl.h:58,
from utimens.c:28:
d:\usr\include\sys\stat.h:173:14: error: unknown type name '_dev_t'
struct _stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:173:14: error: unknown type name '_ino_t'
struct _stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:173:14: error: unknown type name '_mode_t'
struct _stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:173:14: error: unknown type name '_dev_t'
struct _stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:173:14: error: unknown type name '_off_t'
struct _stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:180:13: error: unknown type name '_dev_t'
struct stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:180:13: error: unknown type name '_ino_t'
struct stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:180:13: error: unknown type name '_mode_t'
struct stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:180:13: error: unknown type name '_dev_t'
struct stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:180:13: error: unknown type name '_off_t'
struct stat __struct_stat_defined( _off_t, time_t );
^
d:\usr\include\sys\stat.h:188:17: error: unknown type name '_dev_t'
struct _stati64 __struct_stat_defined( __off64_t, time_t );
^
d:\usr\include\sys\stat.h:188:17: error: unknown type name '_ino_t'
struct _stati64 __struct_stat_defined( __off64_t, time_t );
^
d:\usr\include\sys\stat.h:188:17: error: unknown type name '_mode_t'
struct _stati64 __struct_stat_defined( __off64_t, time_t );
^
d:\usr\include\sys\stat.h:188:17: error: unknown type name '_dev_t'
struct _stati64 __struct_stat_defined( __off64_t, time_t );
^
d:\usr\include\sys\stat.h:188:17: error: unknown type name '__off64_t'
struct _stati64 __struct_stat_defined( __off64_t, time_t );
^
d:\usr\include\sys\stat.h:195:17: error: unknown type name '_dev_t'
struct __stat64 __struct_stat_defined( __off64_t, __time64_t );
^
d:\usr\include\sys\stat.h:195:17: error: unknown type name '_ino_t'
struct __stat64 __struct_stat_defined( __off64_t, __time64_t );
^
d:\usr\include\sys\stat.h:195:17: error: unknown type name '_mode_t'
struct __stat64 __struct_stat_defined( __off64_t, __time64_t );
^
d:\usr\include\sys\stat.h:195:17: error: unknown type name '_dev_t'
struct __stat64 __struct_stat_defined( __off64_t, __time64_t );
^
d:\usr\include\sys\stat.h:195:17: error: unknown type name '__off64_t'
struct __stat64 __struct_stat_defined( __off64_t, __time64_t );
^
In file included from ./sys/stat.h:513:0,
from ./fcntl.h:58,
from utimens.c:28:
d:\usr\include\io.h:503:14: error: unknown type name '__off64_t'
__CRT_INLINE __off64_t lseek64 (int, __off64_t, int);
^~~~~~~~~
d:\usr\include\io.h:503:38: error: unknown type name '__off64_t'
__CRT_INLINE __off64_t lseek64 (int, __off64_t, int);
^~~~~~~~~
d:\usr\include\io.h:505:1: error: unknown type name '__off64_t'
__off64_t lseek64 (int fd, __off64_t offset, int whence)
^~~~~~~~~
d:\usr\include\io.h:505:28: error: unknown type name '__off64_t'
__off64_t lseek64 (int fd, __off64_t offset, int whence)
^~~~~~~~~
In file included from utimens.h:20:0,
from utimens.c:25:
./sys/stat.h:1023:1: error: unknown type name 'mode_t'
_GL_FUNCDECL_RPL (mkdir, int, (char const *name, mode_t mode)
^
In file included from d:\usr\include\unistd.h:57:0,
from ./unistd.h:40,
from ./fcntl.h:67,
from utimens.c:28:
d:\usr\include\process.h:99:53: error: unknown type name '_pid_t'
_CRTIMP __cdecl __MINGW_NOTHROW int _cwait (int *, _pid_t, int);
^~~~~~
d:\usr\include\process.h:101:34: error: unknown type name '_pid_t'
_CRTIMP __cdecl __MINGW_NOTHROW _pid_t _getpid (void);
^~~~~~
d:\usr\include\process.h:177:52: error: unknown type name 'pid_t'
_CRTIMP __cdecl __MINGW_NOTHROW int cwait (int *, pid_t, int);
^~~~~
d:\usr\include\process.h:178:34: error: unknown type name 'pid_t'
_CRTIMP __cdecl __MINGW_NOTHROW pid_t getpid (void);
^~~~~
In file included from d:\usr\include\time.h:45:0,
from ./time.h:41,
from utimens.h:20,
from utimens.c:25:
d:\usr\include\sys/types.h:75:19: error: two or more data types in
declaration specifiers
typedef _off_t off_t;
^
d:\usr\include\sys/types.h:75:19: error: two or more data types in
declaration specifiers
typedef _off_t off_t;
^
d:\usr\include\sys/types.h:75:19: error: two or more data types in
declaration specifiers
typedef _off_t off_t;
^
Makefile:1931: recipe for target `utimens.lo' failed
make[3]: *** [utimens.lo] Error 1
Similar errors happen in nanosleep.c and in libwget/thread.c. All of
the types that GCC complains about are defined in MinGW's sys/types.h.
The reason for all these errors is the fact that Gnulib's
sys_types.in.h does this:
#ifndef _@GUARD_PREFIX@_SYS_TYPES_H
/* The include_next requires a split double-inclusion guard. */
# define _GL_INCLUDING_SYS_TYPES_H
#@INCLUDE_NEXT@ @NEXT_SYS_TYPES_H@
# undef _GL_INCLUDING_SYS_TYPES_H
#ifndef _@GUARD_PREFIX@_SYS_TYPES_H
#define _@GUARD_PREFIX@_SYS_TYPES_H
This assumes that the system header sys/types.h can be included just
once, anywhere in the program, and that is sufficient. (MinGW's
time.h includes sys/types.h, which causes it to include Gnulib's
sys/types.h.) Is that a portable assumption?
What happens with MinGW headers is that when MinGW's sys/types.h is
included from time.h, only a small portion of sys/types.h is
processed, the one that is relevant to time.h types, and that portion
doesn't include the types mentioned in the above error messages. The
next time sys/types.h is included by the program, the Gnulib header
decides it doesn't need to delegate to the system header, because
_@GUARD_PREFIX@_SYS_TYPES_H is already defined. So the relevant
portions of MinGW's sys/types.h are skipped, and we get the error
messages.
My semi-kludgey solution was to include sys/types.h explicitly before
including time.h. I hope there's a more elegant solution, preferably
internal to Gnulib.
Thanks.
P.S. Please CC me on any responses, as I'm not subscribed to the list.
