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# - Try to find R
# Once done this will define
#
# R_FOUND - system has R
# R_EXECUTABLE - executable of R
# R_HOME - home directory of R
# R_INCLUDE_DIR - the R include directory
# R_LIBRARIES - Link these to use R
# find the R binary
FIND_PROGRAM(R_EXECUTABLE R)
SET(ABORT_CONFIG FALSE)
IF(R_EXECUTABLE)
# find R_HOME
IF(NOT R_HOME)
EXECUTE_PROCESS(
COMMAND ${R_EXECUTABLE} "--slave" "--no-save" "-e" "cat(R.home())"
OUTPUT_VARIABLE R_HOME)
ENDIF(NOT R_HOME)
IF(NOT R_HOME)
MESSAGE(STATUS "Could NOT determine R_HOME (probably you misspecified the location of R)")
ENDIF(NOT R_HOME)
# find R include dir
IF(NOT R_INCLUDE_DIR)
IF(WIN32) # This version of the test will not work with R < 2.9.0, but the other version (in the else part) will not work on windows (and on windows the paths are generally standard, anyway).
EXECUTE_PROCESS(
COMMAND ${R_EXECUTABLE} "--slave" "--no-save" "-e" "cat(R.home('include'))"
OUTPUT_VARIABLE R_INCLUDE_DIR)
ELSE(WIN32)
EXECUTE_PROCESS(
COMMAND ${R_EXECUTABLE} CMD sh -c "echo -n $R_INCLUDE_DIR"
OUTPUT_VARIABLE R_INCLUDE_DIR)
ENDIF(WIN32)
ENDIF(NOT R_INCLUDE_DIR)
IF(NOT R_INCLUDE_DIR)
SET(R_INCLUDE_DIR ${R_HOME}/include)
MESSAGE(STATUS "R_Home not findable via R. Guessing")
ENDIF(NOT R_INCLUDE_DIR)
FIND_PATH(R_INCLUDE_DIR R.h)
# check for existence of libR.so
FIND_LIBRARY(R_R_LIBRARY
R
HINTS ${R_HOME}/lib ${R_SHARED_LIB_DIR} ${R_HOME}/bin )
IF(NOT R_R_LIBRARY)
MESSAGE(STATUS "libR not found. Make sure the location of R was detected correctly, above, and R was compiled with the --enable-shlib option")
ELSE(NOT R_R_LIBRARY)
GET_FILENAME_COMPONENT(R_SHARED_LIB_DIR ${R_R_LIBRARY}
PATH)
SET(R_LIBRARIES ${R_R_LIBRARY})
ENDIF(NOT R_R_LIBRARY)
# for at least some versions of R, we seem to have to link against -lRlapack. Else loading some
# R packages will fail due to unresolved symbols, or we can't link against -lR.
# However, we can't do this unconditionally,
# as this is not available in some configurations of R
FIND_LIBRARY(R_LAPACK_LIBRARY
Rlapack
HINTS ${R_SHARED_LIB_DIR} )
IF(NOT R_LAPACK_LIBRARY)
#MESSAGE(STATUS "No, it does not exist in ${R_SHARED_LIB_DIR}")
ELSE(NOT R_LAPACK_LIBRARY)
#MESSAGE(STATUS "Yes, ${R_LAPACK_LIBRARY} exists")
SET(R_LIBRARIES ${R_LIBRARIES} ${R_LAPACK_LIBRARY})
IF(NOT WIN32)
# Query gfortran to get the libgfortran.so path
FIND_PROGRAM(_GFORTRAN_EXECUTABLE NAMES gfortran)
IF(_GFORTRAN_EXECUTABLE)
EXECUTE_PROCESS(COMMAND ${_GFORTRAN_EXECUTABLE} -print-file-name=libgfortran.so
OUTPUT_VARIABLE _libgfortran_path
OUTPUT_STRIP_TRAILING_WHITESPACE
)
ENDIF()
IF(EXISTS ${_libgfortran_path})
SET(GFORTRAN_LIBRARY ${_libgfortran_path})
ELSE()
# if libgfortran wasn't found at this point, the installation is probably broken
# Let's try to find the library nonetheless.
FIND_LIBRARY(GFORTRAN_LIBRARY gfortran)
ENDIF()
IF (GFORTRAN_LIBRARY)
# needed when linking to Rlapack on linux for some unknown reason.
# apparently not needed on windows (let's see, when it comes back to bite us, though)
# and compiling on windows is hard enough even without requiring libgfortran, too.
SET(R_LIBRARIES ${R_LIBRARIES} ${GFORTRAN_LIBRARY})
ELSE (GFORTRAN_LIBRARY)
MESSAGE(STATUS "gfortran is needed for Rlapack but it could not be found")
SET(ABORT_CONFIG TRUE)
ENDIF (GFORTRAN_LIBRARY)
ENDIF(NOT WIN32)
ENDIF(NOT R_LAPACK_LIBRARY)
# for at least some versions of R, we seem to have to link against -lRlapack. Else loading some
# R packages will fail due to unresolved symbols, or we can't link against -lR.
# However, we can't do this unconditionally,
# as this is not available in some configurations of R
FIND_LIBRARY(R_BLAS_LIBRARY
Rblas
HINTS ${R_SHARED_LIB_DIR} )
IF(NOT R_BLAS_LIBRARY)
#MESSAGE(STATUS "No, it does not exist in ${R_SHARED_LIB_DIR}")
ELSE(NOT R_BLAS_LIBRARY)
#MESSAGE(STATUS "Yes, ${R_BLAS_LIBRARY} exists")
SET(R_LIBRARIES ${R_LIBRARIES} ${R_BLAS_LIBRARY})
ENDIF(NOT R_BLAS_LIBRARY)
ENDIF( R_EXECUTABLE )
IF(ABORT_CONFIG)
SET(R_FOUND FALSE)
ELSE(ABORT_CONFIG)
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(R DEFAULT_MSG
R_EXECUTABLE R_INCLUDE_DIR R_R_LIBRARY)
MARK_AS_ADVANCED(R_INCLUDE_DIR R_R_LIBRARY R_LAPACK_LIBRARY R_BLAS_LIBRARY)
ENDIF(ABORT_CONFIG)
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