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CMake cache file for building Pico SDK toolchain
This cache file demonstrates how to build a complete baremetal Clang/LLVM toolchain that can be used to build the Pico SDK.
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‎clang/cmake/caches/Pico.cmake‎

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# This file sets up a CMakeCache for the Pico SDK toolchain build.
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set(CMAKE_BUILD_TYPE Release CACHE STRING "")
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set(LLVM_TARGETS_TO_BUILD ARM;RISCV CACHE STRING "")
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set(LLVM_ENABLE_PROJECTS clang;lld;llvm CACHE STRING "")
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set(LLVM_ENABLE_RUNTIMES compiler-rt;libcxx;libc CACHE STRING "")
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set(CLANG_DEFAULT_CXX_STDLIB libc++ CACHE STRING "")
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set(CLANG_DEFAULT_LINKER lld CACHE STRING "")
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set(CLANG_DEFAULT_RTLIB compiler-rt CACHE STRING "")
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set(LLVM_INSTALL_TOOLCHAIN_ONLY ON CACHE BOOL "")
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set(LLVM_TOOLCHAIN_TOOLS
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llvm-ar
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llvm-cov
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llvm-objcopy
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llvm-objdump
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llvm-profdata
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llvm-ranlib
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llvm-readelf
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llvm-readobj
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llvm-size
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llvm-strings
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llvm-strip
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llvm-symbolizer
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CACHE STRING "")
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set(LLVM_DISTRIBUTION_COMPONENTS
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builtins
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clang
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clang-resource-headers
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lld
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runtimes
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${LLVM_TOOLCHAIN_TOOLS}
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CACHE STRING "")
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# TODO: Switch to newhdrgen for LLVM libc
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set(LLVM_LIBC_FULL_BUILD ON CACHE BOOL "")
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set(LIBC_HDRGEN_ONLY ON CACHE BOOL "")
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set(LLVM_BUILTIN_TARGETS armv8m.main-none-eabi;riscv32-unknown-elf CACHE STRING "")
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foreach(target ${LLVM_BUILTIN_TARGETS})
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set(BUILTINS_${target}_CMAKE_SYSTEM_NAME Generic CACHE STRING "")
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set(BUILTINS_${target}_CMAKE_BUILD_TYPE MinSizeRel CACHE STRING "")
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set(BUILTINS_${target}_COMPILER_RT_BAREMETAL_BUILD ON CACHE BOOL "")
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endforeach()
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set(BUILTINS_armv8m.main-none-eabi_CMAKE_SYSTEM_PROCESSOR arm CACHE STRING "")
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set(BUILTINS_riscv32-unknown-elf_CMAKE_SYSTEM_PROCESSOR RISCV CACHE STRING "")
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foreach(lang C;CXX;ASM)
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set(BUILTINS_armv8m.main-none-eabi_CMAKE_${lang}_FLAGS "-march=armv8m.main+fp+dsp -mcpu=cortex-m33 -mfloat-abi=softfp" CACHE STRING "")
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set(BUILTINS_riscv32-unknown-elf_CMAKE_${lang}_FLAGS "-march=rv32imac_zicsr_zifencei_zba_zbb_zbs_zbkb -mabi=ilp32" CACHE STRING "")
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endforeach()
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set(LLVM_RUNTIME_TARGETS armv8m.main-none-eabi;riscv32-unknown-elf CACHE STRING "")
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foreach(target ${LLVM_RUNTIME_TARGETS})
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set(RUNTIMES_${target}_CMAKE_SYSTEM_NAME Generic CACHE STRING "")
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set(RUNTIMES_${target}_CMAKE_BUILD_TYPE MinSizeRel CACHE STRING "")
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set(RUNTIMES_${target}_CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY CACHE STRING "")
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set(RUNTIMES_${target}_LLVM_ENABLE_RUNTIMES libc;libcxx CACHE STRING "")
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set(RUNTIMES_${target}_LLVM_ENABLE_ASSERTIONS OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LLVM_INCLUDE_TESTS OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LLVM_LIBC_FULL_BUILD ON CACHE BOOL "")
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set(RUNTIMES_${target}_LIBC_ENABLE_USE_BY_CLANG ON CACHE BOOL "")
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# TODO: Switch to newhdrgen for LLVM libc
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set(RUNTIMES_${target}_LIBC_USE_NEW_HEADER_GEN OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_CXX_ABI none CACHE STRING "")
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set(RUNTIMES_${target}_LIBCXX_LIBC llvm-libc CACHE STRING "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_SHARED OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_FILESYSTEM OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_RANDOM_DEVICE OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_LOCALIZATION OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_UNICODE OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_WIDE_CHARACTERS OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_RTTI OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_THREADS OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_ENABLE_MONOTONIC_CLOCK OFF CACHE BOOL "")
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set(RUNTIMES_${target}_LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
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endforeach()
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set(RUNTIMES_armv8m.main-none-eabi_CMAKE_SYSTEM_PROCESSOR arm CACHE STRING "")
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set(RUNTIMES_riscv32-unknown-elf_CMAKE_SYSTEM_PROCESSOR RISCV CACHE STRING "")
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foreach(lang C;CXX;ASM)
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# TODO: Use timespec_get instead of gettimeofday in libc++
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# TODO: Use internal logging API instead of fprintf in libc++
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set(RUNTIMES_armv8m.main-none-eabi_CMAKE_${lang}_FLAGS "-march=armv8m.main+fp+dsp -mcpu=cortex-m33 -mfloat-abi=softfp -Wno-atomic-alignment \"-Dvfprintf(stream, format, vlist)=vprintf(format, vlist)\" \"-Dfprintf(stream, format, ...)=printf(format)\" \"-Dtimeval=struct timeval{int tv_sec; int tv_usec;}\" \"-Dgettimeofday(tv, tz)\" -D_LIBCPP_PRINT=1" CACHE STRING "")
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set(RUNTIMES_riscv32-unknown-elf_CMAKE_${lang}_FLAGS "-march=rv32imac_zicsr_zifencei_zba_zbb_zbs_zbkb -mabi=ilp32 -Wno-atomic-alignment \"-Dvfprintf(stream, format, vlist)=vprintf(format, vlist)\" \"-Dfprintf(stream, format, ...)=printf(format)\" \"-Dtimeval=struct timeval{int tv_sec; int tv_usec;}\" \"-Dgettimeofday(tv, tz)\" -D_LIBCPP_PRINT=1" CACHE STRING "")
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endforeach()

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