2012/7/11 Simson Garfinkel <[email protected]>
> When I #include <fstream> with mingw64-g++ the PRId64 value is no longer
> interpreted correctly.
>
> Here is the test program:
>
> #define __STDC_FORMAT_MACROS
> #include <inttypes.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <stdint.h>
> #include <fstream>
> int main(int argc,char **argv)
> {
> uint64_t val=1234567890;
> printf("%"PRId64"\n",val);
> exit(0);
> }
>
>
> [simsong@FC17 ~]$ x86_64-w64-mingw32-g++ -Wall x.cpp
> x.cpp: In function 'int main(int, char**)':
> x.cpp:19:29: warning: unknown conversion type character 'l' in format
> [-Wformat]
> x.cpp:19:29: warning: too many arguments for format [-Wformat-extra-args]
> [simsong@FC17 ~]$
>
I can reproduce on my GCC 4.7.1 build. The preprocessor output looks like
this:
int main(int argc,char **argv)
{
uint64_t val=1234567890;
printf("%""lld""\n",val);
exit(0);
}
Which should then be pasted together (if I'm not confusing the order of
phases of translation here) to "%lld".
Note also this code is not C++11 compatible, as the "%"PRId64 is considered
a string literal, thus one single token that is not touched by the
preprocessor (see here for reference:
http://stackoverflow.com/questions/11869593/c99-printf-formatters-vs-c11-user-defined-literalsand
exemplified here:
http://liveworkspace.org/code/63c888c11d29eef2f50733be5a5af5e6). GCC
4.7(.1?) will produce an error in accordance with the C++11 Standard.
The reduced test case for this would thus be:
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <fstream>
int main(int argc,char **argv)
{
uint64_t val=1234567890;
printf("%lld\n",val);
exit(0);
}
Additionally, I can confirm that GCC 4.6.3 has the same erroneous warning,
and Clang 3.1 using the same C and C++ headers does not show a warning.
GCC 4.7.1 on Linux does not show this problem:
http://liveworkspace.org/code/f11d1c9024d2319611b4191f7878f856
That concludes my investigation of this piece of code, in the hope it helps
the real coders to find what is going wrong here.
Ruben
> But if I change the test program to this:
>
> #define __STDC_FORMAT_MACROS
> #include <inttypes.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <stdint.h>
> //#include <fstream>
> int main(int argc,char **argv)
> {
> uint64_t val=1234567890;
> printf("%"PRId64"\n",val);
> exit(0);
> }
>
> Then I have no problem compiling:
>
> [simsong@FC17 ~]$ x86_64-w64-mingw32-g++ -Wall x.cpp
> [simsong@FC17 ~]$
>
>
> [simsong@FC17 ~]$ x86_64-w64-mingw32-g++ --version
> x86_64-w64-mingw32-g++ (GCC) 4.7.0 20120322 (Fedora MinGW 4.7.0-2.fc17)
> Copyright (C) 2012 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> [simsong@FC17 ~]$
>
> This makes no sense to me. Is this a bug?
>
>
>
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