1 # This module looks for the Message Passing Interface (MPI).
3 # This module will set the following variables:
4 # MPI_FOUND TRUE if we have found MPI
5 # MPI_COMPILE_FLAGS Compilation flags for MPI programs
6 # MPI_INCLUDE_PATH Include path for MPI header
7 # MPI_LINK_FLAGS Linking flags for MPI programs
8 # MPI_LIBRARIES Libraries to link MPI programs against
9 # MPI_LIBRARY Deprecated; first MPI library to link against
10 # MPI_EXTRA_LIBRARY Deprecated; second MPI library to link against
11 # MPIEXEC Executable for running MPI programs
13 # This module will attempt to auto-detect these settings, first by
14 # looking for a C++ MPI driver (e.g., mpic++, mpiCC, or mpicxx; set by
15 # MPICXX) and later by checking common MPI paths and library names.
17 # Try to find the MPI driver program
19 NAMES mpic++ mpicxx mpiCC
20 DOC "MPI C++ compiler. Used only to detect MPI compilation flags.")
21 mark_as_advanced(MPICXX)
25 DOC "Executable for running MPI programs.")
26 mark_as_advanced(MPIEXEC)
28 if (NOT OLD_MPICXX STREQUAL MPICXX)
29 set(MPI_FORCE_RECONFIGURE TRUE)
30 set(OLD_MPICXX ${MPICXX} CACHE INTERNAL "Previous value of MPICXX" FORCE)
31 endif (NOT OLD_MPICXX STREQUAL MPICXX)
34 # If there is no MPI C++ compiler, we force ourselves to configure
36 set(MPI_FORCE_RECONFIGURE TRUE)
40 # Check whether the -showme:compile option works. This indicates
41 # that we have either Open MPI or a newer version of LAM-MPI, and
42 # implies that -showme:link will also work.
43 exec_program(${MPICXX}
45 OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
46 RETURN_VALUE MPICXX_RETURN)
48 if (MPICXX_RETURN EQUAL 0)
49 # If we appear to have -showme:compile, then we should also have
50 # -showme:link. Try it.
51 exec_program(${MPICXX}
53 OUTPUT_VARIABLE MPI_LINK_CMDLINE
54 RETURN_VALUE MPICXX_RETURN)
55 endif (MPICXX_RETURN EQUAL 0)
57 if (MPICXX_RETURN EQUAL 0)
58 # Do nothing: we have our command lines now
59 else (MPICXX_RETURN EQUAL 0)
60 # Older versions of LAM-MPI have "-showme". Try it.
61 exec_program(${MPICXX}
63 OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
64 RETURN_VALUE MPICXX_RETURN)
65 endif (MPICXX_RETURN EQUAL 0)
67 if (MPICXX_RETURN EQUAL 0)
68 # Do nothing: we have our command lines now
69 else (MPICXX_RETURN EQUAL 0)
70 # MPICH uses "-show". Try it.
71 exec_program(${MPICXX}
73 OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
74 RETURN_VALUE MPICXX_RETURN)
75 endif (MPICXX_RETURN EQUAL 0)
77 if (MPICXX_RETURN EQUAL 0)
78 # We have our command lines, but we might need to copy
79 # MPI_COMPILE_CMDLINE into MPI_LINK_CMDLINE, if the underlying
80 if (NOT MPI_LINK_CMDLINE)
81 SET(MPI_LINK_CMDLINE ${MPI_COMPILE_CMDLINE})
82 endif (NOT MPI_LINK_CMDLINE)
83 else (MPICXX_RETURN EQUAL 0)
84 message(STATUS "Unable to determine MPI from MPI driver ${MPICXX}")
85 endif (MPICXX_RETURN EQUAL 0)
88 if (NOT MPI_FORCE_RECONFIGURE)
89 # We don't actually have to reconfigure anything
90 elseif (MPI_COMPILE_CMDLINE)
91 # Extract compile flags from the compile command line.
92 string(REGEX MATCHALL "-D([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_FLAGS ${MPI_COMPILE_CMDLINE})
93 set(MPI_COMPILE_FLAGS_WORK)
94 foreach(FLAG ${MPI_ALL_COMPILE_FLAGS})
95 if (MPI_COMPILE_FLAGS_WORK)
96 set(MPI_COMPILE_FLAGS_WORK "${MPI_COMPILE_FLAGS_WORK} ${FLAG}")
97 else(MPI_COMPILE_FLAGS_WORK)
98 set(MPI_COMPILE_FLAGS_WORK ${FLAG})
99 endif(MPI_COMPILE_FLAGS_WORK)
102 # Extract include paths from compile command line
103 string(REGEX MATCH "-I([^\" ]+|\"[^\"]+\")" MPI_INCLUDE_PATH ${MPI_COMPILE_CMDLINE})
104 string(REGEX REPLACE "^-I" "" MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH})
105 string(REGEX REPLACE "//" "/" MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH})
107 # Extract linker paths from the link command line
108 string(REGEX MATCH "-L([^\" ]+|\"[^\"]+\")" MPI_LINK_PATH ${MPI_LINK_CMDLINE})
109 string(REGEX REPLACE "^-L" "" MPI_LINK_PATH ${MPI_LINK_PATH})
110 string(REGEX REPLACE "//" "/" MPI_LINK_PATH ${MPI_LINK_PATH})
112 # Extract linker flags from the link command line
113 string(REGEX MATCHALL "-Wl,([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS ${MPI_LINK_CMDLINE})
114 set(MPI_LINK_FLAGS_WORK)
115 foreach(FLAG ${MPI_ALL_LINK_FLAGS})
116 if (MPI_LINK_FLAGS_WORK)
117 set(MPI_LINK_FLAGS_WORK "${MPI_LINK_FLAGS_WORK} ${FLAG}")
118 else(MPI_LINK_FLAGS_WORK)
119 set(MPI_LINK_FLAGS_WORK ${FLAG})
120 endif(MPI_LINK_FLAGS_WORK)
123 # Extract the set of libraries to link against from the link command
125 string(REGEX MATCHALL "-l([^\" ]+|\"[^\"]+\")" MPI_LIBNAMES ${MPI_LINK_CMDLINE})
127 # Determine full path names for all of the libraries that one needs
128 # to link against in an MPI program
130 foreach(LIB ${MPI_LIBNAMES})
131 string(REGEX REPLACE "^-l" "" LIB ${LIB})
132 set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
133 find_library(MPI_LIB ${LIB} PATHS ${MPI_LINK_PATH})
135 list(APPEND MPI_LIBRARIES ${MPI_LIB})
137 status(ERROR "Unable to find MPI library ${LIB}")
140 set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE INTERNAL "Scratch variable for MPI detection" FORCE)
142 # Chop MPI_LIBRARIES into the old-style MPI_LIBRARY and
144 list(LENGTH MPI_LIBRARIES MPI_NUMLIBS)
145 if (MPI_NUMLIBS GREATER 0)
146 list(GET MPI_LIBRARIES 0 MPI_LIBRARY)
147 else (MPI_NUMLIBS GREATER 0)
148 set(MPI_LIBRARY "MPI_LIBRARY-NOTFOUND")
149 endif (MPI_NUMLIBS GREATER 0)
150 if (MPI_NUMLIBS GREATER 1)
151 cdr(MPI_EXTRA_LIBRARY ${MPI_LIBRARIES})
152 else (MPI_NUMLIBS GREATER 1)
153 set(MPI_EXTRA_LIBRARY "MPI_EXTRA_LIBRARY-NOTFOUND")
154 endif (MPI_NUMLIBS GREATER 1)
156 # Set up all of the appropriate cache entries
157 set(MPI_FOUND TRUE CACHE INTERNAL "Whether MPI was found" FORCE)
159 if (NOT MPI_FORCE_RECONFIGURE)
160 set(MPI_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI compilation flags")
161 set(MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH} CACHE STRING "MPI include path")
162 set(MPI_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags")
163 set(MPI_LIBRARIES ${MPI_LIBRARIES} CACHE STRING "MPI libraries to link against, separated by semicolons")
164 else (NOT MPI_FORCE_RECONFIGURE)
165 set(MPI_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI compilation flags" FORCE)
166 set(MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH} CACHE STRING "MPI include path" FORCE)
167 set(MPI_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags" FORCE)
168 set(MPI_LIBRARIES ${MPI_LIBRARIES} CACHE STRING "MPI libraries to link against, separated by semicolons" FORCE)
169 endif (NOT MPI_FORCE_RECONFIGURE)
170 else (MPI_COMPILE_CMDLINE)
171 find_path(MPI_INCLUDE_PATH mpi.h
175 /usr/local/mpi/include
176 "C:/Program Files/MPICH/SDK/Include"
177 "$ENV{SystemDrive}/Program Files/MPICH2/include"
178 "C:/Program Files/Microsoft Compute Cluster Pack/Include"
181 # TODO: How do we know whether we're building 32-bit vs. 64-bit?
182 find_library(MPI_LIBRARY
184 PATHS /usr/lib /usr/local/lib /usr/local/mpi/lib
185 "C:/Program Files/MPICH/SDK/Lib"
186 "$ENV{SystemDrive}/Program Files/MPICH/SDK/Lib"
187 "C:/Program Files/Microsoft Compute Cluster Pack/Lib/i386"
189 find_library(MPI_LIBRARY
192 "$ENV{SystemDrive}/Program Files/MPICH2/Lib")
194 find_library(MPI_EXTRA_LIBRARY
196 PATHS /usr/lib /usr/local/lib /usr/local/mpi/lib
197 "C:/Program Files/MPICH/SDK/Lib"
198 "C:/Program Files/Microsoft Compute Cluster Pack/Lib/i386"
199 DOC "If a second MPI library is necessary, specify it here.")
201 set(MPI_COMPILE_FLAGS "" CACHE STRING "MPI compilation flags")
202 set(MPI_LINK_FLAGS "" CACHE STRING "MPI linking flags")
204 if (MPI_EXTRA_LIBRARY)
205 set(MPI_LIBRARIES "${MPI_LIBRARY};${MPI_EXTRA_LIBRARY}" CACHE STRING "MPI libraries to link against, separated by semicolons")
206 else (MPI_EXTRA_LIBRARY)
207 set(MPI_LIBRARIES ${MPI_LIBRARY} CACHE STRING "MPI libraries to link against, separated by semicolons")
208 endif (MPI_EXTRA_LIBRARY)
211 set(MPI_FOUND TRUE CACHE INTERNAL "Whether MPI was found" FORCE)
213 set(MPI_FOUND FALSE CACHE INTERNAL "Whether MPI was found" FORCE)
215 endif (NOT MPI_FORCE_RECONFIGURE)
217 # on BlueGene/L the MPI lib is named libmpich.rts.a, there also these additional libs are required
218 if("${MPI_LIBRARY}" MATCHES "mpich.rts")
219 set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY} msglayer.rts devices.rts rts.rts devices.rts)
220 set(MPI_LIBRARY ${MPI_LIBRARY} msglayer.rts devices.rts rts.rts devices.rts)
221 endif("${MPI_LIBRARY}" MATCHES "mpich.rts")
223 set(MPI_LIBRARY ${MPI_LIBRARY} CACHE INTERNAL "MPI library to link against. Deprecated: use MPI_LIBRARIES instead")
224 set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY} CACHE INTERNAL "Second MPI library to link against. Deprecated: use MPI_LIBRARIES instead")
226 include(FindPackageHandleStandardArgs)
227 # handle the QUIETLY and REQUIRED arguments
228 find_package_handle_standard_args(MPI DEFAULT_MSG MPI_LIBRARY MPI_INCLUDE_PATH)
229 mark_as_advanced(MPI_INCLUDE_PATH MPI_COMPILE_FLAGS MPI_LINK_FLAGS MPI_LIBRARIES)