On 2013-12-02 at 17:06 -0500, Phil Pennock wrote: > We have to decide on how to resolve a coding issue in Exim, and there > are two fixes available. One fix adds a bunch of complexity. The other > fix just starts using 64-bit integers. I _think_, that as we approach > 2014, we can now rely upon 64-bit integers being available, but we don't > want to leave a platform behind if it's still in use with Exim.
Note: 64-bit integers are often available on 32-bit userlands. A 32-bit
kernel, or a VM, shouldn't matter.
You should be able to compile and run this, and see "4294967297" printed
twice, which is (2^32 + 1):
----------------------------8< cut here >8------------------------------
#include <stdint.h>
#include <stdio.h>
int
main(int argc, char *argv[]) {
int64_t s64;
uint64_t u64;
s64 = 1LL + (1LL << 32);
u64 = 1LL + (1LL << 32);
printf("signed: %lld\nunsigned: %llu\n", s64, u64);
}
----------------------------8< cut here >8------------------------------
If that works, then you're fine. If it doesn't work, then we need to
figure out if that's because your system is so old that it doesn't like
<stdint.h> and the LL modifier, or if it's because your system really
truly doesn't support 64-bit integers in C source code.
Thanks,
-Phil
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