Cross compile for armhf with neon == error: instruction requires: NEON

[mattl...@live.com]

Hey folks, I am new to all this cross-compiling, so I probably did it wrong. I am building using clang 10 for armhf. So far, the c/c++ code seems to compile, but I am not going so well on the assembler for libjpeg.

I get a massive list of errors:

../../../third_party/externals/libjpeg-turbo/simd/arm/jsimd_neon.S:233:5: error: invalid instruction

    vld1.16 {d16, d17, d18, d19}, [COEF_BLOCK, :128]!

    ^

../../../third_party/externals/libjpeg-turbo/simd/arm/jsimd_neon.S:234:5: error: invalid instruction

    vld1.16 {d0, d1, d2, d3}, [DCT_TABLE, :128]!

    ^

../../../third_party/externals/libjpeg-turbo/simd/arm/jsimd_neon.S:235:5: error: invalid instruction

    vld1.16 {d20, d21, d22, d23}, [COEF_BLOCK, :128]!

    ^

../../../third_party/externals/libjpeg-turbo/simd/arm/jsimd_neon.S:236:5: error: instruction requires: NEON

    vmul.s16 q8, q8, q0

    ^

../../../third_party/externals/libjpeg-turbo/simd/arm/jsimd_neon.S:237:5: error: invalid instruction

    vld1.16 {d4, d5, d6, d7}, [DCT_TABLE, :128]!

    ^

../../../third_party/externals/libjpeg-turbo/simd/arm/jsimd_neon.S:238:5: error: instruction requires: NEON

    vmul.s16 q9, q9, q1

    ^

My actual command is this:

clang-10 -MD -MF obj/third_party/externals/libjpeg-turbo/simd/arm/libjpeg.jsimd_neon.o.d -DTURBO_FOR_WINDOWS -DNDEBUG --sysroot=/usr/arm-linux-

gnueabihf --target=armv7a-linux-gnueabihf -mfloat-abi=hard -march=armv7-a -mfpu=neon -mthumb -c ../../../third_party/externals/libjpeg-turbo/simd/arm/jsimd_neon.S -o obj/third_party/externals/libjpe
g-turbo/simd/arm/libjpeg.jsimd_neon.o

[mattl...@live.com]

This is a bit messy due to my hacking, but this is my args.gn

target_os = "linux"

target_cpu = "arm"

is_official_build = true

skia_enable_gpu = true

skia_enable_tools = false

skia_use_icu = false

skia_use_piex = true

skia_use_sfntly = false

skia_use_system_expat = false

skia_use_system_freetype2 = false

skia_use_system_libjpeg_turbo = false

skia_use_system_libpng = false

skia_use_system_libwebp = false

skia_use_system_zlib = false

skia_use_vulkan = true

extra_asmflags = []

extra_cflags = [

  "-DSKIA_C_DLL",

  "-DHAVE_SYSCALL_GETRANDOM",

  "-DXML_DEV_URANDOM",

]

extra_ldflags = [

  "-static-libstdc++",

  "-static-libgcc",

  "-Wl,--version-script=/work/native/linux/libSkiaSharp/libSkiaSharp.map",

]

cc = "clang-10"

cxx = "clang++-10"

linux_soname_version = "80.0.0"

skia_use_fontconfig = false

extra_asmflags += [

  "--sysroot=/usr/arm-linux-gnueabihf",

  "--target=armv7a-linux-gnueabihf",

  "-mfloat-abi=hard",

  "-march=armv7-a",

  "-mfpu=neon",

  "-mthumb",

]

extra_cflags += [

  "--sysroot=/usr/arm-linux-gnueabihf",

  "--target=armv7a-linux-gnueabihf",

  "-mfloat-abi=hard",

  "-march=armv7-a",

  "-mfpu=neon",

  "-mthumb",

  "-I/usr/arm-linux-gnueabihf/include",

  "-I/usr/arm-linux-gnueabihf/include/c++/4.8.5",

  "-I/usr/arm-linux-gnueabihf/include/c++/4.8.5/arm-linux-gnueabihf",

]

extra_ldflags += [

  "--sysroot=/usr/arm-linux-gnueabihf",

  "--target=armv7a-linux-gnueabihf",

  "-mfloat-abi=hard",

  "-march=armv7-a",

  "-mfpu=neon",

  "-mthumb",

]

[mattl...@live.com]

If it matters, I am running in a docker container in wsl 2:

I installed llvm-10 and libstdc++-4.8-dev-armhf-cross libgcc-4.8-dev-armhf-cross binutils-arm-linux-gnueabihf