Re: Mixing Fortran and C (on arm64, ppc64, ppc64el, mips64el and s390x)

On 27/09/15 09:05, Edmund Grimley Evans wrote:
> peter green<[email protected]>:
>
>    
>>  From the ppc64 build log (s390x was much the same).
>>      
> Thank you for taking the trouble to look at the build logs; I just saw
> that it was "Installed" and naively assumed it had worked!
>
> Perhaps then the architectures for which "INTEGER" is "long" (or
> whatever) really are exactly those architectures for which a pointer
> is 64-bit.

Umm, you seem to be reading things backwards.

#if defined(__alpha__) || defined(__sparc64__) || defined(__x86_64__) || 
defined(__ia64__)
typedef int integer;
typedef int logical;
#else
typedef long int integer;
typedef long int logical;
#endif

That code is defining "integer" and "logical" as "long" on most 
architectures but as "int" on a list of 64-bit architectures. My 
interpretation is that the code is trying to make "integer" and 
"logical" 32-bit on all systems.

If you only care about Debian and other modern systems you could 
probablly reduce the code to

typedef int integer;
typedef int logical;

Since int is 32-bit on all Debian architectures.
> #include<stdint.h>
> #if UINTPTR_MAX == UINT64_MAX
>
> I think that last approach is required to work by the standards, while
> __LP64__ is a GCC extension, though I might be wrong.
>    
If my understanding of the intent of the ifdef is correct and you 
believe it's ok to rely on c99 stuff you may as well just do

#include <|inttypes.h|>
typedef int32_t integer;
typedef int32_t logical;