编译arm-linux时为何编译的却是x86

[bigbao9494]

我在一个arm平台下编译(全志，非android)
发现它编译的是src/layer/x86而不是src/layer/arm
但是我编译Android版本时却是正常的，不知道需要怎样修改才能编译出arm版本呢？？？
下面是编译打印：
[ 24%] Building CXX object src/CMakeFiles/ncnn.dir/layer/x86/convolution_x86.cpp.obj
In file included from /home/ncnn-master_20181128_cross/src/layer/x86/convolution_x86.cpp:19:0:

[nihui]

参考 #28
或者参考 pi3.toolchain.cmake

[bigbao9494]

@nihui
你好
我尝试了#28中的方法，仍然不行，以下是我尝试的方法不知道是否正确：
我使用的芯片是全志的H2
1、
新建一个arm.toolchan.cmake
SET(CMAKE_SYSTEM_NANE Android)
SET(CMAKE_SYSTEM_PROCESSOR "armv7-a")
SET(ANDROID_ARCH_NAME "arm")
SET(ANDROID true)
SET(CMAKE_C_COMPILER "arm-cortexa9-linux-gnueabihf-gcc")
SET(CMAKE_CXX_COMPILER "arm-cortexa9-linux-gnueabihf-g++")
然后:mkdir arm;cd arm;cmake -DCMAKE_TOOLCHAIN_FILE=../arm.toolchain.cmake ..;make -j2
2、
直接修改CMakeLists.txt，全部文件内容如下(注释为ljy的是我添加的内容)：
if(CMAKE_TOOLCHAIN_FILE)
set(LIBRARY_OUTPUT_PATH_ROOT ${CMAKE_BINARY_DIR} CACHE PATH "root for library output, set this to change where android libs are compiled to")

get absolute path, but get_filename_component ABSOLUTE only refer with source dir, so find_file here :(

get_filename_component(CMAKE_TOOLCHAIN_FILE_NAME ${CMAKE_TOOLCHAIN_FILE} NAME)
find_file(CMAKE_TOOLCHAIN_FILE ${CMAKE_TOOLCHAIN_FILE_NAME} PATHS ${CMAKE_SOURCE_DIR} NO_DEFAULT_PATH)
message(STATUS "CMAKE_TOOLCHAIN_FILE = ${CMAKE_TOOLCHAIN_FILE}")
endif()

if(NOT DEFINED CMAKE_INSTALL_PREFIX)
set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/install" CACHE PATH "Installation Directory")
endif()
message(STATUS "CMAKE_INSTALL_PREFIX = ${CMAKE_INSTALL_PREFIX}")

cmake_minimum_required(VERSION 2.8.10)

if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE release CACHE STRING "Choose the type of build" FORCE)
endif()

set(COVERAGE OFF CACHE BOOL "Coverage")

project(ncnn)

option(NCNN_OPENMP "openmp support" ON)
option(NCNN_STDIO "load model from external file" ON)
option(NCNN_STRING "plain and verbose string" ON)
option(NCNN_OPENCV "minimal opencv structure emulation" OFF)
option(NCNN_BENCHMARK "print benchmark information for every layer" OFF)
option(NCNN_PIXEL "convert and resize from/to image pixel" ON)
option(NCNN_PIXEL_ROTATE "rotate image pixel orientation" OFF)
option(NCNN_CMAKE_VERBOSE "print verbose cmake messages" OFF)

if(NCNN_OPENMP)
find_package(OpenMP)
# For CMake < 3.9, we need to make the target ourselves
if(NOT TARGET OpenMP::OpenMP_CXX)
find_package(Threads REQUIRED)
add_library(OpenMP::OpenMP_CXX IMPORTED INTERFACE)
set_property(TARGET OpenMP::OpenMP_CXX
PROPERTY INTERFACE_COMPILE_OPTIONS ${OpenMP_CXX_FLAGS})
# Only works if the same flag is passed to the linker; use CMake 3.9+ otherwise (Intel, AppleClang)
set_property(TARGET OpenMP::OpenMP_CXX
PROPERTY INTERFACE_LINK_LIBRARIES ${OpenMP_CXX_FLAGS} Threads::Threads)
endif()
endif()

if(WIN32)
add_definitions(-D_SCL_SECURE_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE)
add_definitions(-DNOMINMAX)
else()

add_definitions(-Wall -Wextra -Wno-unused-function)

add_definitions(-fPIC)
if(CMAKE_BUILD_TYPE MATCHES "(Release|RELEASE|release)")
    add_definitions(-Ofast)

    add_definitions(-ffast-math)
endif()

if(PI3)
    add_definitions(-march=native)
    add_definitions(-mfpu=neon)
    add_definitions(-mfloat-abi=hard)
    add_definitions(-D__ARM_NEON)
    add_definitions(-D__ANDROID__)
endif()
# add_definitions(-march=native)
# add_definitions(-flto)
add_definitions(-fvisibility=hidden -fvisibility-inlines-hidden)

endif()

if(ANDROID)
#if(TRUE) #ljy modify
# disable shared library on android
set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS FALSE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -fno-exceptions")
elseif(IOS)
# disable shared library on xcode ios
set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS FALSE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -fno-exceptions")
endif()

##############################################

add_subdirectory(examples)

add_subdirectory(benchmark)

add_subdirectory(src)
if(NOT ANDROID AND NOT IOS)
add_subdirectory(tools)
endif()

add_definitions(-mfpu=neon)#ljy added.
add_definitions(-march=native)#ljy added.
add_definitions(-mfloat-abi=hard)#ljy added.
add_definitions(-D__ARM_NEON)#ljy added.

[bigbao9494]

@nihui 我git clone最新的NCNN没有找到pi3.toolchain.cmake这个文件呢？
里面只有3个iosxxx.toolchain.cmake啊？

[nihui]

https://github.com/Tencent/ncnn/blob/master/pi3.toolchain.cmake