Yeah, I just noticed that Open MPI was giving me all x86_64 binaries with the configuration flags
./configure --host=riscv64-unknown-linux --enable-static --disable-shared --disable-dlopen --enable-mca-no-build=patcher-overwrite --prefix=/home/ubuntu/src/ben-build/openmpi and was very confused. I thought that the expected behavior for configure scripts was that setting --host=[myarch]-linux-gnu will tell the compiler to use the [myarch]-linux-gnu-[gcc,g++,etc.] compiler when building software that will run on the host arch. This is what other software I've encountered (e.g. MPICH) does. Basically, I want the `orterun` binaries to be compiled with riscv64-unknown-linux-[gcc,g++] compilers and the `mpi[cc,c++]` binaries to be compiled with x86_64-linux-gnu-[gcc,g++] and configured to *use* riscv64-unknown-linux-[gcc,g++] when compiling programs (because, like `orterun`, programs compiled with `mpi[cc,c++]` will run on the host arch). Can I get this by just setting [CC,CXX]=riscv64-unknown-linux-[gcc,g++], etc.? Ben
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