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win32: Simplify gmtime_r detection not depends on if _POSIX_C_SOURCE are defined on msys2/mingw 

We remove the CONFIG_LOCALTIME_R detection option in configure, and move the check
existence of gmtime_r from configure into C header and source directly by using macro
`_POSIX_THREAD_SAFE_FUNCTIONS`.
Before this patch, the configure script are always assume the compiler doesn't define
_POSIX_C_SOURCE macro at all, but that's not true, because thirdparty library such
as ncursesw may define -D_POSIX_C_SOURCE in it's pkg-config file. And that C Flags will
added -D_POSIX_C_SOURCE into each QEMU_CFLAGS. And that's causing the following compiling error:
n file included from C:/work/xemu/qemu/include/qemu/osdep.h:119,
                 from ../softmmu/main.c:25:
C:/work/xemu/qemu/include/sysemu/os-win32.h:53:12: error: redundant redeclaration of 'gmtime_r' [-Werror=redundant-decls]
   53 | struct tm *gmtime_r(const time_t *timep, struct tm *result);
      |            ^~~~~~~~
In file included from C:/work/xemu/qemu/include/qemu/osdep.h:94,
                 from ../softmmu/main.c:25:
C:/CI-Tools/msys64/mingw64/x86_64-w64-mingw32/include/time.h:284:36: note: previous definition of 'gmtime_r' was here
  284 | __forceinline struct tm *__CRTDECL gmtime_r(const time_t *_Time, struct tm *_Tm) {
      |                                    ^~~~~~~~
In file included from C:/work/xemu/qemu/include/qemu/osdep.h:119,
                 from ../softmmu/main.c:25:
C:/work/xemu/qemu/include/sysemu/os-win32.h:55:12: error: redundant redeclaration of 'localtime_r' [-Werror=redundant-decls]
   55 | struct tm *localtime_r(const time_t *timep, struct tm *result);
      |            ^~~~~~~~~~~
In file included from C:/work/xemu/qemu/include/qemu/osdep.h:94,
                 from ../softmmu/main.c:25:
C:/CI-Tools/msys64/mingw64/x86_64-w64-mingw32/include/time.h:281:36: note: previous definition of 'localtime_r' was here
  281 | __forceinline struct tm *__CRTDECL localtime_r(const time_t *_Time, struct tm *_Tm) {
      |                                    ^~~~~~~~~~~
Compiling C object libcommon.fa.p/hw_gpio_zaurus.c.obj
In file included from C:/work/xemu/qemu/include/qemu/osdep.h:119,
                 from ../hw/i2c/smbus_slave.c:16:
C:/work/xemu/qemu/include/sysemu/os-win32.h:53:12: error: redundant redeclaration of 'gmtime_r' [-Werror=redundant-decls]
   53 | struct tm *gmtime_r(const time_t *timep, struct tm *result);
      |            ^~~~~~~~
In file included from C:/work/xemu/qemu/include/qemu/osdep.h:94,
                 from ../hw/i2c/smbus_slave.c:16:
C:/CI-Tools/msys64/mingw64/x86_64-w64-mingw32/include/time.h:284:36: note: previous definition of 'gmtime_r' was here
  284 | __forceinline struct tm *__CRTDECL gmtime_r(const time_t *_Time, struct tm *_Tm) {
      |                                    ^~~~~~~~
In file included from C:/work/xemu/qemu/include/qemu/osdep.h:119,
                 from ../hw/i2c/smbus_slave.c:16:
C:/work/xemu/qemu/include/sysemu/os-win32.h:55:12: error: redundant redeclaration of 'localtime_r' [-Werror=redundant-decls]
   55 | struct tm *localtime_r(const time_t *timep, struct tm *result);
      |            ^~~~~~~~~~~
In file included from C:/work/xemu/qemu/include/qemu/osdep.h:94,
                 from ../hw/i2c/smbus_slave.c:16:
C:/CI-Tools/msys64/mingw64/x86_64-w64-mingw32/include/time.h:281:36: note: previous definition of 'localtime_r' was here
  281 | __forceinline struct tm *__CRTDECL localtime_r(const time_t *_Time, struct tm *_Tm) {
      |                                    ^~~~~~~~~~~
Compiling C object libcommon.fa.p/hw_dma_xilinx_axidma.c.obj

After this patch, whenever ncursesw or other thirdparty libraries tried to define or not
define  _POSIX_C_SOURCE, the source will building properly. Because now, we don't make any
assumption if _POSIX_C_SOURCE are defined. We solely relied on if the macro `_POSIX_THREAD_SAFE_FUNCTIONS`
are defined in msys2/mingw header.

The _POSIX_THREAD_SAFE_FUNCTIONS are defined in mingw header like this:

```
#if defined(_POSIX_C_SOURCE) && !defined(_POSIX_THREAD_SAFE_FUNCTIONS)
#define _POSIX_THREAD_SAFE_FUNCTIONS 200112L
#endif

#ifdef _POSIX_THREAD_SAFE_FUNCTIONS
__forceinline struct tm *__CRTDECL localtime_r(const time_t *_Time, struct tm *_Tm) {
  return localtime_s(_Tm, _Time) ? NULL : _Tm;
}
__forceinline struct tm *__CRTDECL gmtime_r(const time_t *_Time, struct tm *_Tm) {
  return gmtime_s(_Tm, _Time) ? NULL : _Tm;
}
__forceinline char *__CRTDECL ctime_r(const time_t *_Time, char *_Str) {
  return ctime_s(_Str, 0x7fffffff, _Time) ? NULL : _Str;
}
__forceinline char *__CRTDECL asctime_r(const struct tm *_Tm, char * _Str) {
  return asctime_s(_Str, 0x7fffffff, _Tm) ? NULL : _Str;
}
#endif
```

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20201012234348.1427-5-luoyonggang@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Yonggang Luo 2020-10-13 07:43:47 +08:00 committed by Gerd Hoffmann
parent 65f5279761
commit 7c3afc8570
3 changed files with 4 additions and 38 deletions
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34
configure vendored
View File

@ -2386,37 +2386,6 @@ if test "$vhost_net" = ""; then
test "$vhost_kernel" = "yes" && vhost_net=yes
fi
##########################################
# MinGW / Mingw-w64 localtime_r/gmtime_r check
if test "$mingw32" = "yes"; then
# Some versions of MinGW / Mingw-w64 lack localtime_r
# and gmtime_r entirely.
#
# Some versions of Mingw-w64 define a macro for
# localtime_r/gmtime_r.
#
# Some versions of Mingw-w64 will define functions
# for localtime_r/gmtime_r, but only if you have
# _POSIX_THREAD_SAFE_FUNCTIONS defined. For fun
# though, unistd.h and pthread.h both define
# that for you.
#
# So this #undef localtime_r and #include <unistd.h>
# are not in fact redundant.
cat > $TMPC << EOF
#include <unistd.h>
#include <time.h>
#undef localtime_r
int main(void) { localtime_r(NULL, NULL); return 0; }
EOF
if compile_prog "" "" ; then
localtime_r="yes"
else
localtime_r="no"
fi
fi
##########################################
# pkg-config probe
@ -6610,9 +6579,6 @@ if [ "$bsd" = "yes" ] ; then
echo "CONFIG_BSD=y" >> $config_host_mak
fi
if test "$localtime_r" = "yes" ; then
echo "CONFIG_LOCALTIME_R=y" >> $config_host_mak
fi
if test "$qom_cast_debug" = "yes" ; then
echo "CONFIG_QOM_CAST_DEBUG=y" >> $config_host_mak
fi

4
include/sysemu/os-win32.h
View File

@ -48,12 +48,12 @@
#define siglongjmp(env, val) longjmp(env, val)
/* Missing POSIX functions. Don't use MinGW-w64 macros. */
#ifndef CONFIG_LOCALTIME_R
#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
#undef gmtime_r
struct tm *gmtime_r(const time_t *timep, struct tm *result);
#undef localtime_r
struct tm *localtime_r(const time_t *timep, struct tm *result);
#endif /* CONFIG_LOCALTIME_R */
#endif /* _POSIX_THREAD_SAFE_FUNCTIONS */
static inline void os_setup_signal_handling(void) {}
static inline void os_daemonize(void) {}

4
util/oslib-win32.c
View File

@ -106,7 +106,7 @@ void qemu_anon_ram_free(void *ptr, size_t size)
}
}
#ifndef CONFIG_LOCALTIME_R
#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
/* FIXME: add proper locking */
struct tm *gmtime_r(const time_t *timep, struct tm *result)
{
@ -130,7 +130,7 @@ struct tm *localtime_r(const time_t *timep, struct tm *result)
}
return p;
}
#endif /* CONFIG_LOCALTIME_R */
#endif /* _POSIX_THREAD_SAFE_FUNCTIONS */
static int socket_error(void)
{