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LLVM build options for ARM / RaspberryPi

I ask you to clarify what are the best build options for LLVM 3.2 on Raspbian

I got the LLVM 3.2 source, and my config:

cd llvm-3.2.src
./configure --build=armv6-unknown-linux-gnueabi \
--host=armv6-unknown-linux-gnueabi \
--target=armv6-unknown-linux-gnueabi --with-cpu=arm1176jzf-s \
--with-float=hard --with-abi=aapcs-vfp --with-fpu=neon \
--enable-targets=arm --enable-optimized --enable-assertions
make REQUIRES_RTTI=1
sudo make install

I heard that it takes a lot of hours to create. He worked only a few hours, with pleasure just let him work.

This is a long-term assembly project, so I have no doubt about the need to recreate the assembly :)

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1 answer

I would recommend cross compiling LLVM for Raspbian. Building it on the Pi itself takes a lot of time.

fs debootstrap (, Raspbian ). , , .

, clang ( ARM).

LLVM CMake ( chroot fs !):


set(toolchain_dir /path/to/your/chroot-raspbian-armhf/ )
set(toolchain_bin_dir ${toolchain_dir}/usr/bin)
set(toolchain_inc_dir ${toolchain_dir}/usr/include) # was /include
set(toolchain_lib_dir ${toolchain_dir}/usr/lib)

set(CMAKE_SYSTEM_NAME Linux CACHE INTERNAL "system name")
set(CMAKE_SYSTEM_PROCESSOR arm CACHE INTERNAL "processor")
set(CMAKE_C_COMPILER clang)
set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_C_FLAGS "-O2 -integrated-as -target armv6-linux-gnueabihf -mfloat-abi=hard --sysroot=${toolchain_dir}" CACHE INTERNAL "c compiler flags")
set(CMAKE_CXX_FLAGS "-O2 -integrated-as -target armv6-linux-gnueabihf -mfloat-abi=hard --sysroot=${toolchain_dir}" CACHE INTERNAL "cxx compiler flags")

set(link_flags "-L${toolchain_lib_dir} -ldl")

set(CMAKE_EXE_LINKER_FLAGS ${link_flags} CACHE INTERNAL "exe link flags")
set(CMAKE_MODULE_LINKER_FLAGS ${link_flags} CACHE INTERNAL "module link flags")
set(CMAKE_SHARED_LINKER_FLAGS ${link_flags} CACHE INTERNAL "shared link flags")
set(CMAKE_FIND_ROOT_PATH ${toolchain_lib_dir} CACHE INTERNAL "cross root directory")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH CACHE INTERNAL "")
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY CACHE INTERNAL "")
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY CACHE INTERNAL "")

( cmake -DCMAKE_TOOLCHAIN_FILE=/path/to/the/file/above.txt)

, armv6-linux-gnueabihf, armv6-linux-gnueabi.

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