On 1/14/2012 18:55, Kai Tietz wrote: > 2012/1/14 JonY <[email protected]>: >> On 1/14/2012 17:08, Kai Tietz wrote: >>> >>> JonY, >>> >>> I don't see any need in decorating default-printf/scanf-family names >>> by those macros. They getting those default-styles by compiler itself >>> and it isn't of any interest to write it explict here. >>> >>> Kai >> >> OK, I noted something interesting anyway: >> >> This produces no warning, gets printf wrapper to ___mingw_vprintf. >> echo 'int main(){printf("%llu\n",0ull); return 0;}'|i686-w64-mingw32-gcc >> -xc++ -Wall -Wformat -include stdio.h -D__USE_MINGW_ANSI_STDIO=1 -O0 - >> -s -S -o- -fno-builtin >> >> This makes a warning, assembly code similar. >> echo 'int main(){printf("%llu\n",0ull); return 0;}'|i686-w64-mingw32-gcc >> -xc++ -Wall -Wformat -include stdio.h -D__USE_MINGW_ANSI_STDIO=1 -O0 - >> -s -S -o- >> >> No warnings for both if using -xc, maybe its my odd setup. > > Yes, because testcase is invalid. POSIX-printf gets activated if > header is included. By default msvcrt's printf is used. So add > #include <stdio.h> to make testcase valid. >
It is already included with -include stdio.h, it even generated a wrapper to ___mingw_vprintf. Clearly, the overrides in the header has taken effect. Besides, if the include was missing, -xc++ shouldn't be able to build. I even tested my adding the defines into stdio.h itself. >> Btw, why are some of the msvcrt prototypes not declared with _CRTIMP anyway? > > See headers, see libmingwex.a implementation and this question is answered. > > Kai For default printf, the comment says "Default configuration: simply direct all calls to MSVCRT...".
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