Hi, I suggest cleaning some comments, mostly using the "official" spellings for MinGW and Mingw-w64.
Am 22.09.2015 um 16:13 schrieb Daniel P. Berrange:
> The oslib-win32 file currently provides a localtime_r and
> gmtime_r replacement unconditionally. Some versions of
> Mingw64 would provide crude macros for localtime_r/gmtime_r
MinGW / Mingw-w64
> which QEMU takes care to disable. Latest versions of Mingw64
Mingw-w64
> now provide actual functions for localtime_r/gmtime_r, but
> with a twist that you have to include unistd.h or pthread.h
> before including time.h. By luck some files in QEMU have
> such an include order, resulting in compile errors:
>
> CC util/osdep.o
> In file included from include/qemu-common.h:48:0,
> from util/osdep.c:48:
> include/sysemu/os-win32.h:77:12: error: redundant redeclaration of 'gmtime_r'
> [-Werror=redundant-decls]
> struct tm *gmtime_r(const time_t *timep, struct tm *result);
> ^
> In file included from include/qemu-common.h:35:0,
> from util/osdep.c:48:
> /usr/i686-w64-mingw32/sys-root/mingw/include/time.h:272:107: note: previous
> definition of 'gmtime_r' was here
> In file included from include/qemu-common.h:48:0,
> from util/osdep.c:48:
> include/sysemu/os-win32.h:79:12: error: redundant redeclaration of
> 'localtime_r' [-Werror=redundant-decls]
> struct tm *localtime_r(const time_t *timep, struct tm *result);
> ^
> In file included from include/qemu-common.h:35:0,
> from util/osdep.c:48:
> /usr/i686-w64-mingw32/sys-root/mingw/include/time.h:269:107: note: previous
> definition of 'localtime_r' was here
>
> This change adds a configure test to see if localtime_r
> exits, and only enables the QEMU impl if missing. We also
> re-arrange qemu-common.h try attempt to guarantee that all
> source files get unistd.h before time.h and thus see the
> localtime_r/gmtime_r defs.
>
> Signed-off-by: Daniel P. Berrange <berra...@redhat.com>
> ---
> configure | 34 ++++++++++++++++++++++++++++++++++
> include/qemu/osdep.h | 4 +++-
> include/sysemu/os-win32.h | 2 ++
> util/oslib-win32.c | 2 ++
> 4 files changed, 41 insertions(+), 1 deletion(-)
>
> diff --git a/configure b/configure
> index 52f5b79..4654be8 100755
> --- a/configure
> +++ b/configure
> @@ -1737,6 +1737,37 @@ else
> fi
>
> ##########################################
> +# Mingw64 localtime_r/gmtime_r check
MinGW / Mingw-w64
> +
> +if test "$mingw32" = "yes"; then
> + # Some versions of Mingw32/64 lack localtime_r
MinGW / Mingw-w64
> + # and gmtime_r entirely
Missing .
> + #
> + # Some versions of Mingw64 define a macro for
Mingw-w64
> + # localtime_r/gmtime_r/etc
Why etc? Missing .
> + #
> + # Some versions of Ming64 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
Missing .
> +cat > $TMPC << EOF
> +#include <unistd.h>
> +#include <time.h>
> +#undef localtime_r
> +int main(void) { localtime_r(NULL, NULL); return 0; }
> +EOF
> + if compile_prog "" "" ; then
> + localtime_r="yes"
> + else
> + localtime_r="no"
> + fi
> +fi
> +
> +##########################################
> # pkg-config probe
>
> if ! has "$pkg_config_exe"; then
> @@ -5050,6 +5081,9 @@ fi
> if test "$zero_malloc" = "yes" ; then
> echo "CONFIG_ZERO_MALLOC=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
> diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
> index ab3c876..e490028 100644
> --- a/include/qemu/osdep.h
> +++ b/include/qemu/osdep.h
> @@ -38,10 +38,12 @@
> #include <strings.h>
> #include <inttypes.h>
> #include <limits.h>
> +/* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
> + * function availability on recentish Mingw64 platforms */
Mingw-w64. I'm not sure how long this hack will work.
A future patch could add -DPOSIX_C_SOURCE to the compiler options
if configure has set $localtime_r.
> +#include <unistd.h>
> #include <time.h>
> #include <ctype.h>
> #include <errno.h>
> -#include <unistd.h>
> #include <fcntl.h>
> #include <sys/stat.h>
> #include <sys/time.h>
> diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h
> index 706d85a..13dcef6 100644
> --- a/include/sysemu/os-win32.h
> +++ b/include/sysemu/os-win32.h
> @@ -73,10 +73,12 @@
> #define siglongjmp(env, val) longjmp(env, val)
>
> /* Missing POSIX functions. Don't use MinGW-w64 macros. */
> +#ifndef CONFIG_LOCALTIME_R
> #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 */
>
>
> static inline void os_setup_signal_handling(void) {}
> diff --git a/util/oslib-win32.c b/util/oslib-win32.c
> index 730a670..08f5a9c 100644
> --- a/util/oslib-win32.c
> +++ b/util/oslib-win32.c
> @@ -95,6 +95,7 @@ void qemu_anon_ram_free(void *ptr, size_t size)
> }
> }
>
> +#ifndef CONFIG_LOCALTIME_R
> /* FIXME: add proper locking */
> struct tm *gmtime_r(const time_t *timep, struct tm *result)
> {
> @@ -118,6 +119,7 @@ struct tm *localtime_r(const time_t *timep, struct tm
> *result)
> }
> return p;
> }
> +#endif /* CONFIG_LOCALTIME_R */
>
> void qemu_set_block(int fd)
> {
>
Otherwise this patch looks good.
If you agree, I'd clean the comments before I add
the patch to my patch queue for Windows
(git://qemu.weilnetz.de/qemu.git wxx).
Regards
Stefan
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