Getting R and Rcpp CPP and LD flags

CMakeFile.txt

set(NUM_TRUNC_CHARS 2)

execute_process(
        COMMAND R CMD config --cppflags
        OUTPUT_VARIABLE RCPPFLAGS)
string(SUBSTRING ${RCPPFLAGS} ${NUM_TRUNC_CHARS} -1 RCPPFLAGS)
include_directories(${RCPPFLAGS})
message("R CPP flags: ${RCPPFLAGS}")

execute_process(
        COMMAND R CMD config --ldflags
        OUTPUT_VARIABLE RLDFLAGS)
string(LENGTH ${RLDFLAGS} RLDFLAGS_LEN)
message("R LD flags: ${RLDFLAGS}")

if (${RLDFLAGS} MATCHES "[-][L]([^ ;])+")
    string(SUBSTRING ${CMAKE_MATCH_0} ${NUM_TRUNC_CHARS} -1 RLDFLAGS_L)
    string(STRIP ${RLDFLAGS_L} RLDFLAGS_L )
    link_directories(${RLDFLAGS_L})
endif()

if (${RLDFLAGS} MATCHES "[-][l]([^;])+")
    string(SUBSTRING ${CMAKE_MATCH_0} ${NUM_TRUNC_CHARS} -1 RLDFLAGS_l)
    string(STRIP ${RLDFLAGS_l} RLDFLAGS_l )
    link_libraries(${RLDFLAGS_l})
endif()

execute_process(
        COMMAND Rscript -e "Rcpp:::CxxFlags()"
        OUTPUT_VARIABLE RCPPINCL)
string(SUBSTRING ${RCPPINCL} ${NUM_TRUNC_CHARS} -1 RCPPINCL)
include_directories(${RCPPINCL})
message("Rcpp CPP flags: ${RCPPINCL}")

execute_process(
        COMMAND Rscript -e "Rcpp:::LdFlags()"
        OUTPUT_VARIABLE RCPPLIBS)
if (${RCPPLIBS} MATCHES "[-][L]([^ ;])+")
    string(SUBSTRING ${CMAKE_MATCH_0} ${NUM_TRUNC_CHARS} -1 RCPPLIBS_L)
    link_directories(${RCPPLIBS_L} )
endif()
message("Rcpp LD flags: ${RCPPLIBS}")