# Apply optimizations flags to targets and correctly export interface
#
# Define two functions
#
# - spc_set_objlib_optimization_flags(<objlib>)
#     To apply the optimization flags to the object libraries
#
# - spc_set_target_optimization_flags(<target>)
#     To apply the optimization flags to the
#

# Gold Linker
# ------------
# for LTO flags and compilation optimization
include(gold_linker)
if (USE_LD_GOLD)
    LIST(APPEND PUBLIC_FEATURES ${SPECMICP_GOLD_LINKER_FLAG})
endif()

# OPENMP
if (OpenMP_CXX_FOUND AND SPECMICP_USE_OPENMP)
    set(SPECMICP_HAVE_OPENMP ON)
endif()

# Native architecture
# -------------------
include(CheckCXXCompilerFlag)
if(${SPECMICP_OPTIMIZE_FOR_NATIVE})
    CHECK_CXX_COMPILER_FLAG("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
    if(COMPILER_SUPPORTS_MARCH_NATIVE)
        LIST(APPEND PUBLIC_FEATURES -march=native)
    endif()
endif()


# Link time optimization
# ----------------------
include(lto)
if(HAVE_LTO_FLAG AND SPECMICP_LTO)
    LIST(APPEND PUBLIC_FEATURES ${SPECMICP_LTO_FLAGS})
endif()


# functions definitions
# ---------------------



# Cache
set(SPECMICP_PRIVATE_OPTIONS ${PRIVATE_FEATURES} CACHE INTERNAL "Specmicp public optimization options")
set(SPECMICP_PUBLIC_OPTIONS  ${PUBLIC_FEATURES} CACHE INTERNAL "Specmicp private optimization options")


function(spc_set_objlib_optimization_flags target)
    # object libraries cannot directly link to other libraries, so we only add the flag
    LIST(APPEND PUBLIC_OPTIONS ${SPECMICP_PUBLIC_OPTIONS})
    if (OpenMP_CXX_FOUND AND SPECMICP_USE_OPENMP)
        LIST(APPEND PUBLIC_OPTIONS ${OpenMP_CXX_FLAGS})
    endif()
    target_compile_options(${target} PUBLIC ${PUBLIC_OPTIONS} PRIVATE ${SPECMICP_PRIVATE_OPTIONS})

endfunction(spc_set_objlib_optimization_flags target)

function(spc_set_target_optimization_flags target)
    target_compile_options(${target} PUBLIC ${SPECMICP_PUBLIC_OPTIONS} PRIVATE ${SPECMICP_PRIVATE_OPTIONS})
    if(OpenMP_CXX_FOUND AND SPECMICP_USE_OPENMP)
        target_link_libraries(${target} PUBLIC OpenMP::OpenMP_CXX)
    endif()
endfunction(spc_set_target_optimization_flags target)