问题状态：xxx.so: cannot open shared object file: No such file or directory
一、分析
首先要知道linux寻找动态链接库的顺序
1.编译目标代码时指定的动态库搜索路径（-L选项明文指定的目录）
2.环境变量LD_LIBRARY_PATH指定的动态库搜索路径；
3.配置文件/etc/ld.so.conf中指定的动态库搜索路径；
4.默认的动态库搜索路径/lib；
5.默认的动态库搜索路径/usr/lib
二、解决
方式一
1，将缺少的库文件拷贝到指定目录下
2，通过
方式二
1，将缺少的库文件拷贝到指定目录下
2，将libhello.so拷贝到/usr/local/lib，然后运行ldconfig
方式三
1，将缺少的库文件拷贝到指定目录下
2，使用RPATH
//RPATH设置当前路径
$(CROSS)g++ $(CFLAGS) -Wl,-rpath,'$$ORIGIN' -o $@ $^ $(LIBSO) -Xlinker "-(" $(LIBS) -Xlinker "-)" $(LFLAGS)
//RPATH设置指定路径：../../flyCV/flycv/aarch64/
$(CROSS)g++ $(CFLAGS) -Wl,-rpath,'../../flyCV/flycv/aarch64/' -o $@ $^ $(LIBSO) -Xlinker "-(" $(LIBS) -Xlinker "-)"
$(LFLAGS)
三、如何检查RPATH的值
有多种方法可以检查可执行文件或库的RPATH值。objdump、readelf和chrpath是3个常用的实用程序。
//反汇编
jetson@Nano:/mnt/demoITA/test_app/src$ objdump -x guideman | grep RPATH
RPATH $ORIGIN
//反汇编关键函数
objdump -d guideman | grep ITA
//readelf
jetson@Nano:/mnt/demoITA/test_app/src$ readelf -d guideman | head -20
Dynamic section at offset 0x5d28 contains 33 entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [libdl.so.2]
0x0000000000000001 (NEEDED) Shared library: [../../ITALib/ITA_VER02/ITALib_test/lib/libITA.so]
0x0000000000000001 (NEEDED) Shared library: [libflycv_shared.so]
0x0000000000000001 (NEEDED) Shared library: [libpthread.so.0]
0x0000000000000001 (NEEDED) Shared library: [libstdc++.so.6]
0x0000000000000001 (NEEDED) Shared library: [libm.so.6]
0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1]
0x0000000000000001 (NEEDED) Shared library: [libc.so.6]
0x0000000000000001 (NEEDED) Shared library: [ld-linux-aarch64.so.1]
0x000000000000000f (RPATH) Library rpath: [../../flyCV/flycv/aarch64/]
0x000000000000000c (INIT) 0x4022a0
0x000000000000000d (FINI) 0x404104
0x0000000000000019 (INIT_ARRAY) 0x415c58
0x000000000000001b (INIT_ARRAYSZ) 32 (bytes)
0x000000000000001a (FINI_ARRAY) 0x415c78
0x000000000000001c (FINI_ARRAYSZ) 8 (bytes)
0x0000000000000004 (HASH) 0x400298