On Sat, Mar 2, 2013 at 6:29 AM, Dmitri Gribenko <[email protected]> wrote:
On Sat, Mar 2, 2013 at 6:51 AM, Dave Goodell <[email protected]> wrote:
On Mar 1, 2013, at 9:57 PM CST, Jeff Hammond wrote:
I apologize in advance for being ultra-pedantic.
I am using MPI in a purely C++ code. Is there a way to make this warning go away? I know at least one MPICH developer who shares my disdain for compiler warnings, so I hope this isn't too unreasonable.
Since I am using a C++ compiler, I can't exactly tell it to use C99 mode.
/Users/jhammond/eclipse/MPICH2/trunk/install-clang/include/mpi.h:526:9: warning: 'long long' is an extension when C99 mode is not enabled [-pedantic,-Wlong-long] typedef long long MPI_Count;
Don't compile with -pedantic. It's almost never a useful flag. Alternatively, add "-Wno-long-long" if you need other windmills to tilt at.
I would argue that -pedantic is, in fact, a useful flag. For example, LLVM and Clang are compiled with -pedantic, but we also add -Wno-long-long (and a few other flags) to disable warnings about extensions that are implemented virtually in every compiler. And, LLVM and Clang have *zero* warnings when compiled with itself.
Is there a configure option that will cause MPICH to "typedef long MPI_Count" instead? I compile apps with -pedantic when I want to be absolutely certainly that a non-standard language usage is causing an error. I know MPICH isn't the issue here but that doesn't mean that I don't aspire to compile apps without any warnings. Jeff -- Jeff Hammond Argonne Leadership Computing Facility University of Chicago Computation Institute [email protected] / (630) 252-5381 http://www.linkedin.com/in/jeffhammond https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond