diff options
| -rw-r--r-- | Modules/FindMPI.cmake | 62 |
1 files changed, 58 insertions, 4 deletions
diff --git a/Modules/FindMPI.cmake b/Modules/FindMPI.cmake index 1d42a91..d251088 100644 --- a/Modules/FindMPI.cmake +++ b/Modules/FindMPI.cmake @@ -184,8 +184,15 @@ endforeach() # (Windows implementations) do not have compiler wrappers, so this approach must be used. # function (interrogate_mpi_compiler lang try_libs) - # if it's already in the cache, don't bother with any of this stuff - if ((NOT MPI_${lang}_INCLUDE_PATH) OR (NOT MPI_${lang}_LIBRARIES)) + # MPI_${lang}_NO_INTERROGATE will be set to a compiler name when the *regular* compiler was + # discovered to be the MPI compiler. This happens on machines like the Cray XE6 that use + # modules to set cc, CC, and ftn to the MPI compilers. If the user force-sets another MPI + # compiler, MPI_${lang}_COMPILER won't be equal to MPI_${lang}_NO_INTERROGATE, and we'll + # inspect that compiler anew. This allows users to set new compilers w/o rm'ing cache. + string(COMPARE NOTEQUAL "${MPI_${lang}_NO_INTERROGATE}" "${MPI_${lang}_COMPILER}" interrogate) + + # If MPI is set already in the cache, don't bother with interrogating the compiler. + if (interrogate AND ((NOT MPI_${lang}_INCLUDE_PATH) OR (NOT MPI_${lang}_LIBRARIES))) if (MPI_${lang}_COMPILER) # Check whether the -showme:compile option works. This indicates that we have either OpenMPI # or a newer version of LAM-MPI, and implies that -showme:link will also work. @@ -436,6 +443,43 @@ function (interrogate_mpi_compiler lang try_libs) endfunction() +function(try_regular_compiler lang success) + # last ditch attempt: just try to compile something with the regular compiler + if (${lang} STREQUAL Fortran) + set(test_file ${CMAKE_CURRENT_BINARY_DIR}/cmake_mpi_test.f90) + file(WRITE ${test_file} + "program hello\n" + "include 'mpif.h'\n" + "integer ierror\n" + "call MPI_INIT(ierror)\n" + "call MPI_FINALIZE(ierror)\n" + "end\n") + else() + if (${lang} STREQUAL CXX) + set(test_file ${CMAKE_CURRENT_BINARY_DIR}/cmake_mpi_test.cpp) + else() + set(test_file ${CMAKE_CURRENT_BINARY_DIR}/cmake_mpi_test.c) + endif() + file(WRITE ${test_file} + "#include <mpi.h>\n" + "int main(int argc, char **argv) {\n" + " MPI_Init(&argc, &argv);\n" + " MPI_Finalize();\n" + "}\n") + endif() + try_compile(worked ${CMAKE_CURRENT_BINARY_DIR} ${test_file}) + if (worked) + set(MPI_${lang}_NO_INTERROGATE ${CMAKE_${lang}_COMPILER} CACHE STRING "Whether to interrogate MPI ${lang} compiler" FORCE) + set(MPI_${lang}_COMPILER ${CMAKE_${lang}_COMPILER} CACHE STRING "MPI ${lang} compiler" FORCE) + set(MPI_${lang}_COMPILE_FLAGS "" CACHE STRING "MPI ${lang} compilation flags" FORCE) + set(MPI_${lang}_INCLUDE_PATH "" CACHE STRING "MPI ${lang} include path" FORCE) + set(MPI_${lang}_LINK_FLAGS "" CACHE STRING "MPI ${lang} linking flags" FORCE) + set(MPI_${lang}_LIBRARIES "" CACHE STRING "MPI ${lang} libraries to link against" FORCE) + endif() + set(${success} ${worked} PARENT_SCOPE) + file(REMOVE ${test_file}) +endfunction() + # End definitions, commence real work here. # Most mpi distros have some form of mpiexec which gives us something we can reliably look for. @@ -507,8 +551,18 @@ foreach (lang C CXX Fortran) interrogate_mpi_compiler(${lang} ${try_libs}) mark_as_advanced(MPI_${lang}_COMPILER) - # Treat each language separately as far as outputting whether we found support for it and setting MPI_<lang>_FOUND. - find_package_handle_standard_args(MPI_${lang} DEFAULT_MSG MPI_${lang}_LIBRARIES MPI_${lang}_INCLUDE_PATH) + # last ditch try -- if nothing works so far, just try running the regular compiler and + # see if we can create an MPI executable. + set(regular_compiler_worked 0) + if (NOT MPI_${lang}_LIBRARIES OR NOT MPI_${lang}_INCLUDE_PATH) + try_regular_compiler(${lang} regular_compiler_worked) + endif() + + if (regular_compiler_worked) + find_package_handle_standard_args(MPI_${lang} DEFAULT_MSG MPI_${lang}_COMPILER) + else() + find_package_handle_standard_args(MPI_${lang} DEFAULT_MSG MPI_${lang}_LIBRARIES MPI_${lang}_INCLUDE_PATH) + endif() endif() endforeach() |