Differences between version 3 and predecessor to the previous major change of PortabilityNotes.
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| Newer page: | version 3 | Last edited on Thursday, October 12, 2006 3:37:57 pm | by PerryLorier | Revert |
| Older page: | version 2 | Last edited on Friday, July 7, 2006 9:44:30 am | by AristotlePagaltzis | Revert |
@@ -154,12 +154,15 @@
<verbatim>
uint64_t x;
printf("%"PRIu64,x);
</verbatim>
+
+! Avoid using other peoples types in your headers
+Other peoples types change in size, sometimes at the flick of a #define. One example is off_t changes if LARGEFILE64 is defined under Linux. Use the c99 <tt><stdint.h></tt> types (uint64_t) so that they don't vary. If you absolutely must reference someone elses type, do so via a pointer (eg FILE*) and treat it as opaque.
!! See also
* [HP] has [a set of C portability notes | http://docs.hp.com/en/5074/portability.html], although it targets HP-UX.
* [Intel] has [a similar set of notes | http://www.intel.com/cd/ids/developer/asmo-na/eng/technologies/64bit/200519.htm?page=1] (for porting to [ia64] and [amd64])
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Part of CategoryProgramming
