Bug into all_reduce

[micdestefano@…]

Good Morning.

I've found a bug into the file

boost/mpi/collectives/all_reduce.hpp

At line 36 you should change

is_mpi_op<Op, T>::op()

into

(is_mpi_op<Op, T>::op())

i.e. add a couple of parentheses around the expression. Without those parentheses, this build error occurs:

error: macro "MPI_Allreduce" passed 7 arguments, but takes just 6

because the comma that separates template parameters confuses the preprocessor.

I've noticed that the bug is still present into the Boost.MPI development version.

My compiler is gcc 4.1.2.

Thank you in advance.
Michele De Stefano

[federico.golfre@…]

Hi!

Using the gather function of the Boost.MPI (which calls the MPI_Allreduce) my compiler (gcc 4.1.2) throws the same error.

I've changed the boost/mpi/collectives/all_reduce.hpp following the instructions posted by Michele and it runs.

Thank you, Federico Golfrè Andreasi

[anonymous]

Good Morning. I noticed that on January, 31st, Boost 1.38.0 will be released. I've also noticed that the bug I signaled (see above) has not been fixed yet.

May you fix it before the release, please ?

I also suggested the modification and I'm sure that in 5 minutes you'll be done.
Please, control other collectives too.

Thank you again.

Michele

[micdestefano@…]

I re-opened this ticket, because the bug is still present into the 1.38.0 version.

[micdestefano@…]

The bug is still present into the 1.39 release.

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