On 2017/9/13 0:15, Eli Zaretskii wrote:
You'd need to disassemble (or at least check with nm) the
object/function to find out if it's calling __mingw_printf or regular
printf, seems like emacs is using %lld and %I64 in different places.
%lld is used for intmax_t values, %I64d is used for 64-bit values.
Are you saying that MinGW64 doesn't support both %lld and %I64d? If
so, under which conditions is each one supported?
`printf()` provided by MSVCRT recognizes only `%I64d`, while
`__mingw_printf()` provided by MinGW-w64, which takes over `printf()`
due to `__USE_MINGW_ANSI_STDIO`, recognizes only `%lld`.
FWIW, with a C99-conforming `printf()` you can use `%jd` for `intmax_t`...
Check if keyboard.c and print.c is using __USE_MINGW_ANSI_STDIO
consistently.
The Emacs config.h defines __USE_MINGW_ANSI_STDIO, and all sources
include config.h. So yes, this is used consistently.
What is the effect of __USE_MINGW_ANSI_STDIO on format specs
recognized by the MinGW64 GCC 7 compiler at compile time?
This isn't related to the version of GCC, but to the version of
MinGW-w64 you have.
If `__USE_MINGW_ANSI_STDIO` is defined to something non-zero and
<intypes> is included *after* <stdio.h> or <wchar.h>, you get `%lld` for
`PRIdMAX`, otherwise you get `%I64d`. This basically covers three cases:
Case 1:
```
#include <stdio.h>
#include <inttypes.h>
int main(void){
/* Calls `printf()` from MSVCRT.
Outputs `I64d 42` */
printf("%s: %" PRIdMAX, PRIdMAX, INTMAX_C(42));
}
```
Case 2:
```
#define __USE_MINGW_ANSI_STDIO 1
#include <stdio.h>
#include <inttypes.h>
int main(void){
/* Calls `__mingw_printf()` from MinGW-w64.
Outputs `lld 42` */
printf("%s: %" PRIdMAX, PRIdMAX, INTMAX_C(42));
}
```
Case 3:
```
#define __USE_MINGW_ANSI_STDIO 1
/* The user declares such a function {him,her}self...
LD will resolve references to this function to the MSVCRT one,
which accepts `%I64d`, rather than `%lld`. */
extern int printf(const char *, ...);
#include <inttypes.h>
int main(void){
/* Calls `printf()` from MSVCRT.
Outputs "I64d 42" */
printf("%s: %" PRIdMAX, PRIdMAX, INTMAX_C(42));
}
```
--
Best regards,
LH_Mouse
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