> -----Original Message----- > From: Jed Brown [mailto:five9a2 at gmail.com] On Behalf Of Jed Brown > Sent: Thursday, April 25, 2013 11:09 AM > To: Chetan Jhurani; 'For users of the development version of PETSc' > Subject: Re: [petsc-dev] MPI_UNSIGNED_LONG_LONG in mpiuni.h > > Chetan Jhurani <chetan.jhurani at gmail.com> writes: > > > Hi, > > > > mpiuni.h does not define MPI_UNSIGNED_LONG_LONG, which leads > > to a problem in defining MPIU_SIZE_T here in petscsys.h. > > > > #if (PETSC_SIZEOF_SIZE_T) == (PETSC_SIZEOF_INT) > > #define MPIU_SIZE_T MPI_UNSIGNED > > #elif (PETSC_SIZEOF_SIZE_T) == (PETSC_SIZEOF_LONG) > > #define MPIU_SIZE_T MPI_UNSIGNED_LONG > > #elif (PETSC_SIZEOF_SIZE_T) == (PETSC_SIZEOF_LONG_LONG) > > #define MPIU_SIZE_T MPI_UNSIGNED_LONG_LONG > > mpiuni/mpi.h also has this unguarded statement. Do all Windows > compilers now provide 'long long'? > > #define MPI_LONG_LONG_INT sizeof(long long) > > We could make mpiuni define MPIU_SIZE_T itself instead of jumping > through hoops to find the matching type. > > Chetan, what's your perspective about using stdint.h?
Info about long long: Visual Studio 2005 supports long long (sizeof = 8) even when compiling in 32 bit mode, so I assume all later ones do. Trilinos 11.0+ uses long long for 64-bit indices. I have tested it with two compilers (2005/2012) and I'm guessing others have used other versions. About stdint.h: I see that it is there with Visual Studio 2012 on my machine, but not with 2005. Below is more info on stdint and MS VS. I never had a need to use it so can't say more than this. http://stackoverflow.com/questions/126279/c99-stdint-h-header-and-ms-visual-studio Chetan
