How To Ar Multi Static Libs To One
怎么正确的把多个静态库打包成一个库
最近因为项目的原因,需要将第三方库,打包一个整库,便于使用. 但是在查找了网上一些例子后,发现都不能完全解决问题.
那么我们首先来说说实际的需求
需求 : 将opencv通过交叉编译生成的静态库+第三方库,打包为一个库. 其中需要注意的是,各个库之间存在依赖关系.
网上有一种,比较普遍的解决办法,就是把所有库通过 ar -x lib.a,全部解包为 *.o 文件.
然后再通过 ar -qcs target.a *.o这种方法来打包成一个库.
执行到这里都是没问题的,ar可以类比为tar打包的感觉,随便怎么打都没问题. 但是当你用这个库去编写可执行程序的时候,问题来了,链接的时候,报错.各种数据结构和函数找不到.
原因是什么呢,其实和很简单,链接的顺序出了问题.
首先我们需要知道,正确的添加库的顺序,在opencv源代码编译好,并install的目的路径,查看文件/hisiv200_complier_opencv3.1.0_lib/lib/pkgconfig/opencv.pc的内容.
可以得知默认使用opencv库的添加顺序是:
libopencv_imgcodecs.a
libopencv_shape.a
libopencv_stitching.a
libopencv_superres.a
libopencv_videostab.a
libopencv_video.a
libopencv_photo.a
libopencv_aruco.a
libopencv_calib3d.a
libopencv_features2d.a
libopencv_bioinspired.a
libopencv_dnn.a
libopencv_dpm.a
libopencv_face.a
libopencv_objdetect.a
libopencv_ml.a
libopencv_fuzzy.a
libopencv_reg.a
libopencv_imgproc.a
libopencv_surface_matching.a
libopencv_flann.a
libopencv_core.a
libzlib.a
liblibjpeg.a
liblibwebp.a
liblibpng.a
liblibjasper.a
liblibprotobuf.a
如果一个个去输入解包在排序再打包,那基本就是可以告别程序员这个职业了. 这里需要写一个脚本来自动完成.
#!/bin/bash
#global var
AR=arm-hisiv200-linux-ar #cross compiler
lib_sequence="libopencv_stitching.a libopencv_superres.a libopencv_videostab.a libopencv_photo.a libopencv_aruco.a libopencv_bgsegm.a libopencv_bioinspired.a libopencv_dnn.a libopencv_dpm.a libopencv_fuzzy.a libopencv_line_descriptor.a libopencv_optflow.a libopencv_plot.a libopencv_reg.a libopencv_saliency.a libopencv_stereo.a libopencv_structured_light.a libopencv_rgbd.a libopencv_surface_matching.a libopencv_tracking.a libopencv_datasets.a libopencv_text.a libopencv_face.a libopencv_xfeatures2d.a libopencv_shape.a libopencv_video.a libopencv_ximgproc.a libopencv_calib3d.a libopencv_features2d.a libopencv_flann.a libopencv_xobjdetect.a libopencv_objdetect.a libopencv_highgui.a libopencv_videoio.a libopencv_imgcodecs.a libopencv_ml.a libopencv_imgproc.a libopencv_core.a"
object_file_sq
target_combine_lib="libhisi200_opencv_static_combine.a"
#functions
function ar_static_libs_to_one()
{
cd $work_dir
for lib_file in $lib_sequence
do
if [ "${lib_file##*.}"x = "a"x ];then # if is a *.a lib file
# echo -e "\nvvvvvvvvvvvv AR ${lib_file} to .o file vvvvvvvvvvvv" # test print
echo -e "\nvvvvvvvvvvvv AR ${lib_file} to .o file vvvvvvvvvvvv" >> print.log # test log
${AR} -x ${lib_file}
object_file_sq+=$(${AR} -t ${lib_file})
object_file_sq+=" "
# echo $object_file_sq # test print
echo -e $object_file_sq >> print.log # test log
fi
done
echo -e "\nvvvvvvvvvvvv Build combine lib vvvvvvvvvvvv"
echo $object_file_sq
${AR} -qcs $target_combine_lib $object_file_sq
}
#main
work_dir="$1"
echo "rm all .o files"
rm -rf ./*.o
echo "rm ${target_combine_lib}"
rm -rf ./${target_combine_lib}
ar_static_libs_to_one $work_dir
使用该脚本
./ar_multi_static_lib_to_one.sh ./hisiv200_complier_opencv3.1.0_lib/lib
就会在所选的lib库目录,进行操作,会在目标路径生成需要的打包库和调试日志.