On Sat, Nov 2, 2013 at 8:28 AM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 27 October 2013 23:36, Cyd Haselton wrote: >> Android apparently doesn't support implicit conversion so had to do a >> cast before the argument is passed. > > N.B. it's not "Android" that doesn't support conversion from long > long* to long*, it's C++. Not sure what N.B. means... This is probably an obvious question but since I'm still working my way through C I have to ask: If C++ does not support that conversion, why is it in the code? And does C++ not support implicit conversion from long long* to long* or explicit, or both? > > As I said, the question is why Android's stat::st_size field is not of > type off_t in the first place. That is an excellent question and one that I can't answer completely as I'm still parsing my way through the Android libc source. I can say that st_size is defined as an unsigned long (which according to the error is off_t) in one location...and from what I can tell it seems to be conditional upon a macro definition. Here's a snippet from the asm/stat.h unsigned long st_size; *snip* #define STAT64_HAS_BROKEN_ST_INO 1 *snip* long long st_size; Confusingly, however, it appears to be defined as a long long in every other stat.h...or kernel_stat.h. Even MORE confusing, st_size is defined as an off_t...but, near as I can tell, only for the mips architecture.
