Hello Adrian, Jonathan, * Adrian Knoth wrote on Sat, Aug 19, 2006 at 08:38:15PM CEST: > On Thu, Aug 17, 2006 at 11:48:44PM +0100, Jonathan Underwood wrote: > > > Compiling a file with the gcc options -Wall and -pedantic gives the > > following warning: > > mpi.h:147: warning: ISO C90 does not support 'long long' > > Is this intentional, or is this a bug? > > If you do not insist on using C90, you may compile with -std=c99 > to get rid of this message ;)
More precisely, the OpenMPI installation that provides this mpi.h file was compiled with 'long long' support, which quite undoubtedly is a feature rather than a bug. Users should not compile their code with strict C89 settings. > I don't have the C90 (ANSI-C) at my fingertips, but I confirm it > does not support "long long". Yes. > Perhaps we should use int64_t instead. No, that would not help: int64_t is C99, so it should not be declared either in C89 mode. Also, the int64_t is required to have 64 bits, and could thus theoretically be smaller than 'long long' (no, I don't think any such systems exist today). Cheers, Ralf
