install_name_tool 更新可执行文件以在 Mac OS X 中搜索 dylib [英] install_name_tool to update a executable to search for dylib in Mac OS X
问题描述
我有一个安装在 /PATH/lib
中的动态库 libtest.dylib,以及一个执行二进制文件 myapp,它使用安装在 /PATH/bin
.
I have a dynamic libray libtest.dylib that is installed in /PATH/lib
, and an execution binary, myapp, that uses the dylib installed in /PATH/bin
.
我可以运行 myapp
来查找 dylib,如下所示 (可以在 Mac OS X 上使用 DYLD_LIBRARY_PATH 吗?还有,它的动态库搜索算法是什么?):
I can run myapp
to find the dylib as follows (Is it OK to use DYLD_LIBRARY_PATH on Mac OS X? And, what's the dynamic library search algorithm with it?):
DYLD_LIBRARY_PATH="/PATH/lib" myapp
我想我可以使用 install_name_tool
来更新库和可执行文件,以便可以使用 rpath 找到该库.我使用了这篇文章中的提示 - 如何指定 rpath在动态库中?.
I think I can use install_name_tool
to update the library and executable so that the library can be found with rpath. I used the hints in this post - How can I specify the rpath in a dylib?.
在lib中,我执行了这个命令来添加rpath.
In lib, I executed this command to add rpath.
install_name_tool -id "@rpath/libtest.dylib" libtest.dylib
install_name_tool -add_rpath "@executable_path/../lib/" libtest.dylib
在 bin 中,我执行了 install_name_tool -add_rpath "@executable_path/../lib/" myapp
.
In bin, I executed install_name_tool -add_rpath "@executable_path/../lib/" myapp
.
但是,当我在 bin
目录中执行 myapp
时,出现错误消息.
However, when I executed myapp
in bin
directory, I have the error messages.
dyld: Library not loaded: libtest.dylib
Referenced from: /PATH/bin/./myapp
Reason: image not found
Trace/BPT trap: 5
otool -l myapp
显示 rpath 在 myapp 中正确更新.
otool -l myapp
shows the rpath is correctly updated in myapp.
Load command 16
cmd LC_RPATH
cmdsize 40
path @executable_path/../lib/ (offset 12)
libtest.dylib 也是如此
The same is true with libtest.dylib
Load command 13
cmd LC_RPATH
cmdsize 40
path @executable_path/../lib/ (offset 12)
可能有什么问题?
当然,我可以在编译和链接时使用 cc -install_name
,但我想知道如何做同样的事情我修改了生成的 dylib 和执行二进制文件.
Of course, I can use cc -install_name
when compile and link time, but I wanted to know how to do the same thing my modifying the generatd dylib and execution binary.
来自库:
cc -install_name "@loader_path/../lib/libtest.dylib" -dynamiclib -o libtest.dylib test.c
或者,install_name 可以使用@rpath:
Or, the install_name can use @rpath:
cc -install_name "@rpath/libtest.dylib" -dynamiclib -o libtest.dylib test.c
来自垃圾箱:
cc -I../lib -c main.c
cc -o main main.o ../lib/libtest.dylib -Wl,-rpath -Wl,@loader_path/../lib
或者只有一行:
cc -I../lib -L../lib -o main main.c -ltest -Wl,-rpath -Wl,@loader_path/../lib
推荐答案
从 otool -l
中,我分析了原始库和二进制文件中应该添加或修改的内容.
From otool -l
, I analyzed what should be added or modified from the original library and binary.
更改在 id 中:
Load command 2 <-- OLD
cmd LC_ID_DYLIB
cmdsize 40
name libtest.dylib (offset 24)
time stamp 1 Wed Dec 31 18:00:01 1969
Load command 2 <-- NEW
cmd LC_ID_DYLIB
cmdsize 64
name @loader_path/../lib/libtest.dylib (offset 24)
这是完成更改的命令:
install_name_tool -id "@loader_path/../lib/libtest.dylib" libtest.dylib
或者使用rpath:
install_name_tool -id "@rpath/libtest.dylib" libtest.dylib
可执行文件
有两个变化:rpath 和 load_dylib
The executable
There are two changes: rpath and load_dylib
Load command 12 <-- OLD
cmd LC_LOAD_DYLIB
cmdsize 40
name libtest.dylib (offset 24)
Load command 12 <-- NEW
cmd LC_LOAD_DYLIB
cmdsize 64
name @loader_path/../lib/libtest.dylib (offset 24)
这是完成更改的命令
install_name_tool -change libtest.dylib @loader_path/../lib/libtest.dylib myapp
我还需要添加 rpath
Also I needed to add the rpath
Load command 14
cmd LC_RPATH
cmdsize 32
path @loader_path/../lib (offset 12)
这是完成添加的命令:
install_name_tool -add_rpath "@loader_path/../lib" myapp
想法
二进制文件试图找到库,它知道它从 install_name_tool -add_rpath "@loader_path/../lib" myapp
所在的位置.它加载库,库的 id 是 @rpath/libtest.dylib
,其中 @rpath
设置为 @loader_path/../lib
在可执行二进制文件中进行匹配.
The idea
The binary tries to find the library, it knows where it is located from install_name_tool -add_rpath "@loader_path/../lib" myapp
. It loads the library, and the library's id is @rpath/libtest.dylib
where @rpath
is set to @loader_path/../lib
in the executable binary to make the match.
使用 CMake 时,我们可以通过在 CMakeLists.txt 文件中添加以下内容来自动化该过程.
When using CMake, we can automatize the process with the following addition in CMakeLists.txt file.
应该添加id.
# https://cmake.org/pipermail/cmake/2006-October/011530.html
SET_TARGET_PROPERTIES (test
PROPERTIES BUILD_WITH_INSTALL_RPATH 1
INSTALL_NAME_DIR "@rpath"
)
可执行
应该指定rpath:
Executable
The rpath should be specified:
SET(CMAKE_INSTALL_RPATH "@loader_path/../lib/libtest.dylib")
这篇关于install_name_tool 更新可执行文件以在 Mac OS X 中搜索 dylib的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!