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#===============================================================================
# Define targets for linking against the selected C library
#
# After including this file, the following targets are defined:
# - runtimes-libc-headers: An interface target that allows getting access to the
# headers of the selected C library.
# - runtimes-libc-shared: A target representing the selected shared C library.
# - runtimes-libc-static: A target representing the selected static C library.
#===============================================================================
include_guard(GLOBAL)
set(RUNTIMES_SUPPORTED_C_LIBRARIES system llvm-libc)
set(RUNTIMES_USE_LIBC "system" CACHE STRING "Specify C library to use. Supported values are ${RUNTIMES_SUPPORTED_C_LIBRARIES}.")
if (NOT "${RUNTIMES_USE_LIBC}" IN_LIST RUNTIMES_SUPPORTED_C_LIBRARIES)
message(FATAL_ERROR "Unsupported C library: '${RUNTIMES_CXX_ABI}'. Supported values are ${RUNTIMES_SUPPORTED_C_LIBRARIES}.")
endif()
# Link against a system-provided libc
if (RUNTIMES_USE_LIBC STREQUAL "system")
add_library(runtimes-libc-headers INTERFACE)
add_library(runtimes-libc-static INTERFACE)
add_library(runtimes-libc-shared INTERFACE)
# Link against the in-tree LLVM libc
elseif (RUNTIMES_USE_LIBC STREQUAL "llvm-libc")
add_library(runtimes-libc-headers INTERFACE)
target_link_libraries(runtimes-libc-headers INTERFACE libc-headers)
check_cxx_compiler_flag(-nostdlibinc CXX_SUPPORTS_NOSTDLIBINC_FLAG)
if(CXX_SUPPORTS_NOSTDLIBINC_FLAG)
target_compile_options(runtimes-libc-headers INTERFACE "-nostdlibinc")
if(LIBC_KERNEL_HEADERS)
target_compile_options(runtimes-libc-headers INTERFACE "-idirafter${LIBC_KERNEL_HEADERS}")
endif()
endif()
add_library(runtimes-libc-static INTERFACE)
if (TARGET libc)
target_link_libraries(runtimes-libc-static INTERFACE libc)
endif()
if (TARGET libm)
target_link_libraries(runtimes-libc-static INTERFACE libm)
endif()
if (CXX_SUPPORTS_NOLIBC_FLAG)
target_link_options(runtimes-libc-static INTERFACE "-nolibc")
endif()
# TODO: There's no support for building LLVM libc as a shared library yet.
add_library(runtimes-libc-shared INTERFACE)
endif()
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