derek.holloway
7502bf64a4
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56 lines
2.2 KiB
CMake
56 lines
2.2 KiB
CMake
#===============================================================================
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# Define targets for linking against the selected C library
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#
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# After including this file, the following targets are defined:
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# - runtimes-libc-headers: An interface target that allows getting access to the
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# headers of the selected C library.
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# - runtimes-libc-shared: A target representing the selected shared C library.
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# - runtimes-libc-static: A target representing the selected static C library.
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#===============================================================================
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include_guard(GLOBAL)
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if(TARGET runtimes-libc-headers)
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return()
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endif()
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set(RUNTIMES_SUPPORTED_C_LIBRARIES system llvm-libc picolibc newlib)
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set(RUNTIMES_USE_LIBC "system" CACHE STRING "Specify C library to use. Supported values are ${RUNTIMES_SUPPORTED_C_LIBRARIES}.")
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if (NOT "${RUNTIMES_USE_LIBC}" IN_LIST RUNTIMES_SUPPORTED_C_LIBRARIES)
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message(FATAL_ERROR "Unsupported C library: '${RUNTIMES_USE_LIBC}'. Supported values are ${RUNTIMES_SUPPORTED_C_LIBRARIES}.")
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endif()
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# Link against a system-provided libc
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if (RUNTIMES_USE_LIBC STREQUAL "system")
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add_library(runtimes-libc-headers INTERFACE)
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add_library(runtimes-libc-static INTERFACE)
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add_library(runtimes-libc-shared INTERFACE)
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# Link against the in-tree LLVM libc
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elseif (RUNTIMES_USE_LIBC STREQUAL "llvm-libc")
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add_library(runtimes-libc-headers INTERFACE)
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target_link_libraries(runtimes-libc-headers INTERFACE libc-headers)
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check_cxx_compiler_flag(-nostdlibinc CXX_SUPPORTS_NOSTDLIBINC_FLAG)
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if(CXX_SUPPORTS_NOSTDLIBINC_FLAG)
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target_compile_options(runtimes-libc-headers INTERFACE "-nostdlibinc")
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if(LIBC_KERNEL_HEADERS)
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target_compile_options(runtimes-libc-headers INTERFACE "-idirafter${LIBC_KERNEL_HEADERS}")
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endif()
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endif()
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add_library(runtimes-libc-static INTERFACE)
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if (TARGET libc)
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target_link_libraries(runtimes-libc-static INTERFACE libc)
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endif()
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if (TARGET libm)
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target_link_libraries(runtimes-libc-static INTERFACE libm)
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endif()
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if (CXX_SUPPORTS_NOLIBC_FLAG)
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target_link_options(runtimes-libc-static INTERFACE "-nolibc")
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endif()
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# TODO: There's no support for building LLVM libc as a shared library yet.
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add_library(runtimes-libc-shared INTERFACE)
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endif()
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