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MSVC: Fix an "incompatible pointer types" compiler warning
In particular, the following warning is issued while compiling compat/msvc.c: ...mingw.c(223) : warning C4133: 'function' : incompatible \ types - from '_stati64 *' to '_stat64 *' which relates to a call of _fstati64() in the mingw_fstat() function definition. This is caused by various layers of macro magic and attempts to avoid macro redefinition compiler warnings. For example, the call to _fstati64() mentioned above is actually a call to _fstat64(), and expects a pointer to a struct _stat64 rather than the struct _stati64 which is passed to mingw_fstat(). The definition of struct _stati64 given in compat/msvc.h had the same "shape" as the definition of struct _stat64, so the call to _fstat64() does not actually cause any runtime errors, but the structure types are indeed incompatible. In order to avoid the compiler warning, we add declarations for the mingw_lstat() and mingw_fstat() functions and supporting macros to msvc.h, suppressing the corresponding declarations in mingw.h, so that we can use the appropriate structure type (and function) names from the msvc headers. Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -209,13 +209,15 @@ int mingw_getpagesize(void);
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* mingw_fstat() instead of fstat() on Windows.
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*/
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#define off_t off64_t
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#define stat _stati64
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#define lseek _lseeki64
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#ifndef ALREADY_DECLARED_STAT_FUNCS
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#define stat _stati64
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int mingw_lstat(const char *file_name, struct stat *buf);
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int mingw_fstat(int fd, struct stat *buf);
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#define fstat mingw_fstat
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#define lstat mingw_lstat
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#define _stati64(x,y) mingw_lstat(x,y)
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#endif
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int mingw_utime(const char *file_name, const struct utimbuf *times);
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#define utime mingw_utime
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@ -21,30 +21,22 @@ static __inline int strcasecmp (const char *s1, const char *s2)
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}
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#undef ERROR
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#undef stat
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#undef _stati64
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#include "compat/mingw.h"
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#undef stat
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#define stat _stati64
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#define _stat64(x,y) mingw_lstat(x,y)
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/*
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Even though _stati64 is normally just defined at _stat64
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on Windows, we specify it here as a proper struct to avoid
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compiler warnings about macro redefinition due to magic in
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mingw.h. Struct taken from ReactOS (GNU GPL license).
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*/
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struct _stati64 {
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_dev_t st_dev;
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_ino_t st_ino;
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unsigned short st_mode;
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short st_nlink;
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short st_uid;
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short st_gid;
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_dev_t st_rdev;
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__int64 st_size;
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time_t st_atime;
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time_t st_mtime;
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time_t st_ctime;
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};
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/* Use mingw_lstat() instead of lstat()/stat() and mingw_fstat() instead
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* of fstat(). We add the declaration of these functions here, suppressing
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* the corresponding declarations in mingw.h, so that we can use the
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* appropriate structure type (and function) names from the msvc headers.
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*/
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#define stat _stat64
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int mingw_lstat(const char *file_name, struct stat *buf);
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int mingw_fstat(int fd, struct stat *buf);
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#define fstat mingw_fstat
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#define lstat mingw_lstat
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#define _stat64(x,y) mingw_lstat(x,y)
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#define ALREADY_DECLARED_STAT_FUNCS
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#include "compat/mingw.h"
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#undef ALREADY_DECLARED_STAT_FUNCS
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#endif
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