Try the following program with g++ with and without the first line:
#define __STDC_LIMIT_MACROS 1
#include <limits.h>
#include <stdint.h>
#include <iostream>
using namespace std;
#if INTMAX_MAX != LONG_MAX
#error error2
#endif
#if INTMAX_MAX != LLONG_MAX
#error error3
#endif
#if UINTMAX_MAX != ULONG_MAX
#error error5
#endif
#if UINTMAX_MAX != ULLONG_MAX
#error error6
#endif
int main(void)
{
intmax_t a = 0;
cout << INTMAX_MAX << " " << LLONG_MAX << endl;
return 0;
}
On 9 April 2014 16:38, Jean-Pierre Flori <jpfl...@gmail.com> wrote:
> Oh sure, one has to use g++... and the the !__cpluplus becomes false.
>
> 2014-04-09 16:36 GMT+02:00 Bill Hart <goodwillh...@googlemail.com>:
> > g++ bla.c
> > prag.c:5:17: warning: expected a string after '#pragma message'
> [-Wpragmas]
> > #pragma message INTMAX_MAX
> > ^
> > prag.c:6:17: warning: expected a string after '#pragma message'
> [-Wpragmas]
> > #pragma message __STDC_LIMIT_MACROS
> >
> >
> >
> > On 9 April 2014 16:33, Jean-Pierre Flori <jpfl...@gmail.com> wrote:
> >>
> >> 2014-04-09 16:24 GMT+02:00 Bill Hart <goodwillh...@googlemail.com>:
> >> > Yeah, as I said, they get defined only if you first do:
> >> >
> >> > #define __STDC_LIMIT_MACROS 1
> >> It seems I don't need this define on my setup (unless I misunderstood
> >> you):
> >>
> >> $ cat bla.c
> >> #include <stdint.h>
> >> #include <limits.h>
> >>
> >> #pragma message LONG_MAX
> >> #pragma message INTMAX_MAX
> >> #pragma message __STDC_LIMIT_MACROS
> >> #if LONG_MAX == INTMAX_MAX
> >> #pragma message eq
> >> #endif
> >>
> >> $cpp bla.c
> >> ...
> >> # 4 "bla.c"
> >> #pragma message 9223372036854775807L
> >> # 4 "bla.c"
> >>
> >>
> >> # 5 "bla.c"
> >> #pragma message (9223372036854775807L)
> >> # 5 "bla.c"
> >>
> >>
> >> # 6 "bla.c"
> >> #pragma message __STDC_LIMIT_MACROS
> >> # 6 "bla.c"
> >>
> >>
> >>
> >> # 8 "bla.c"
> >> #pragma message eq
> >> # 8 "bla.c"
> >
> >
>
>
>
> --
> Jean-Pierre Flori
>
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