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CMake: Adds an AArch64 cross-compile toolchain file

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This is useful for some people.

This doesn't allow building thunks due to the cmake limitation about
tools binaries also getting cross compiled, we need to switch to meson
if we want that, since they recently started fixing this
https://github.com/mesonbuild/meson/pull/12022

But that's an okay limitation for now.
This commit is contained in:
Ryan Houdek 2024-08-31 00:38:59 -07:00
parent 3020a0db2b
commit 17692d6eef
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1 changed files with 35 additions and 0 deletions
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35
CMakeToolchains/AArch64.cmake Normal file
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# This is a reference AArch64 cross compile script
# Pass in to cmake when building:
# eg: cmake -DCMAKE_TOOLCHAIN_FILE=../CMakeToolchains/AArch64.cmake ..
if (NOT DEFINED ENV{SYSROOT})
message(FATAL_ERROR "Need to have SYSROOT environment variable set")
endif()
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR aarch64)
set(CMAKE_CROSSCOMPILING TRUE)
# Target triple needs to match the binutils exactly
set(TARGET_TRIPLE aarch64-linux-gnu)
set(CMAKE_C_COMPILER "clang")
set(CMAKE_CXX_COMPILER "clang++")
set(CMAKE_C_COMPILER_AR "llvm-ar")
set(CMAKE_CXX_COMPILER_AR "llvm-ar")
set(CMAKE_C_COMPILER_RANLIB "llvm-ranlib")
set(CMAKE_CXX_COMPILER_RANLIB "llvm-ranlib")
set(CMAKE_LINKER "ld.lld")
set(CMAKE_C_COMPILER_TARGET ${TARGET_TRIPLE})
set(CMAKE_CXX_COMPILER_TARGET ${TARGET_TRIPLE})
# Set the environment variable SYSROOT to the aarch64 rootfs
set(CMAKE_FIND_ROOT_PATH "$ENV{SYSROOT}")
set(CMAKE_SYSROOT "$ENV{SYSROOT}")
list(APPEND CMAKE_PREFIX_PATH "$ENV{SYSROOT}/usr/lib/${TARGET_TRIPLE}/cmake/")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)