# Set standard, system and compiler libraries explicitly.
# This is intended for more control of what we are linking.

set (DEFAULT_LIBS "-nodefaultlibs")

# We need builtins from Clang
execute_process (COMMAND
    ${CMAKE_CXX_COMPILER} --target=${CMAKE_CXX_COMPILER_TARGET} --print-libgcc-file-name --rtlib=compiler-rt
    OUTPUT_VARIABLE BUILTINS_LIBRARY
    COMMAND_ERROR_IS_FATAL ANY
    OUTPUT_STRIP_TRAILING_WHITESPACE)

# Apparently, in clang-19, the UBSan support library for C++ was moved out into ubsan_standalone_cxx.a, so we have to include both.
if (SANITIZE STREQUAL undefined)
    string(REPLACE "builtins.a" "ubsan_standalone_cxx.a" EXTRA_BUILTINS_LIBRARY "${BUILTINS_LIBRARY}")
endif ()

if (NOT EXISTS "${BUILTINS_LIBRARY}")
    set (BUILTINS_LIBRARY "-lgcc")
endif ()

if (OS_ANDROID)
    # pthread and rt are included in libc
    set (DEFAULT_LIBS "${DEFAULT_LIBS} ${BUILTINS_LIBRARY} ${EXTRA_BUILTINS_LIBRARY} ${COVERAGE_OPTION} -lc -lm -ldl")
elseif (USE_MUSL)
    set (DEFAULT_LIBS "${DEFAULT_LIBS} ${BUILTINS_LIBRARY} ${EXTRA_BUILTINS_LIBRARY} ${COVERAGE_OPTION} -static -lc")
else ()
    set (DEFAULT_LIBS "${DEFAULT_LIBS} ${BUILTINS_LIBRARY} ${EXTRA_BUILTINS_LIBRARY} ${COVERAGE_OPTION} -lc -lm -lrt -lpthread -ldl")
endif ()

message(STATUS "Default libraries: ${DEFAULT_LIBS}")

set(CMAKE_CXX_STANDARD_LIBRARIES ${DEFAULT_LIBS})
set(CMAKE_C_STANDARD_LIBRARIES ${DEFAULT_LIBS})

# Unfortunately '-pthread' doesn't work with '-nodefaultlibs'.
# Just make sure we have pthreads at all.
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)

include (cmake/unwind.cmake)
include (cmake/cxx.cmake)

if (NOT OS_ANDROID)
    if (NOT USE_MUSL)
        # Our compatibility layer doesn't build under Android, many errors in musl.
        add_subdirectory(base/glibc-compatibility)
    endif ()
    add_subdirectory(base/harmful)
endif ()

link_libraries(global-group)

target_link_libraries(global-group INTERFACE
    -Wl,--start-group
    $<TARGET_PROPERTY:global-libs,INTERFACE_LINK_LIBRARIES>
    -Wl,--end-group
)