[freetds] building 0.83.dev.20101013 with VC9: _vsnprintf error

jklowden at schemamania.org jklowden at schemamania.org
Thu Oct 14 09:52:26 EDT 2010

On Thu, Oct 14, 2010 at 11:24:59AM +0200, Roman Neuhauser wrote:
> here's what i got building yesterday's snapshot with VC9.
> c:\MinGW\msys\1.0\home\roman\wc\freetds-0.83.dev.20101013>nmake -nologo -f Nmakefile FROM_TARBALL= PLATFORM=win32 CONFIGURATION=debug
>         cl  -nologo     -W3 -Wp64 -EHsc -TC -Gm  -errorReport:prompt -D "_MBCS" -D "_LIB" -D "WIN32"  -D "_CRT_SECURE_NO_WARNINGS" -D _CRT_NONSTDC_NO_DEPRECATE -D "HAVE_CONFIG_H"  -D "_FREETDS_LIBRARY_SOURCE" -I "include" -I "win32" -I "include\x64" -c -MTd -Od -D "_DEBUG"  -ZI -RTC1   -Fo"src\replacements\win32\debug\\"  -Fd"src\replacements\win32\debug\vc80.pdb"  src\replacements\asprintf.c src\replacements\basename.c src\replacements\fakepoll.c src\replacements\gettimeofday.c src\replacements\getopt.c src\replacements\iconv.c src\replacements\readpassphrase.c src\replacements\strlcat.c src\replacements\strlcpy.c src\replacements\strtok_r.c src\replacements\vasprintf.c
> getopt.c
> c:\program files\microsoft visual studio 9.0\vc\include\stdio.h(358) : error C3163: '_vsnprintf': attributes inconsistent with previous declaration
>         c:\program files\microsoft visual studio 9.0\vc\include\stdio.h(350) : see declaration of '_vsnprintf'

This looks to be a matter of lying to the compiler.  

$ grep -i printf win32/config.h
/* Define to 1 if you have the `asprintf' function. */
/* #undef HAVE_ASPRINTF */
/* Define to 1 if you have the `vasprintf' function. */
/* #undef HAVE_VASPRINTF */
/* Define to 1 if you have the `vsnprintf' function. */
/* #undef HAVE_VSNPRINTF */
/* Define to 1 if you have the `_vsnprintf' function. */

so HAVE__VSNPRINTF is true, but HAVE_VSNPRINTF is not.  That's a mistake, because Microsoft provides vsnprintf(3).

Then, include/replacements.h says:

#undef vsnprintf
#define vsnprintf _vsnprintf
int vsnprintf(char *ret, size_t max, const char *fmt, va_list ap);
#endif /*  HAVE_VSNPRINTF */
#endif /* !HAVE__VSNPRINTF */

so the preprocessor has been told to define vsnprintf in terms of _vsnprintf.  When the compiler reads stdio.h, it finds two declaraations: the real one and our override.  

I would try modifying win32/config.h to define HAVE_VSNPRINTF:




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