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我正在链接一个二进制文件，该二进制文件导入在两个依赖 dylib 中定义的符号，但我无法ld选择正确的。

该符号是_init_process并且它在 libSystem.dylib（由 ld 隐式添加）和 libida.dylib（我们的库）中定义。我想ld选择libida，但我无法让它发挥作用。

这是最终的链接器命令行：

/usr/libexec/gcc/i686-apple-darwin10/4.2.1/ld -dynamic -dylib
-dylib_compatibility_version 1.0 -dylib_current_version 1.0 -arch
i386 -macosx_version_min 10.5 -macosx_version_min 10.5
-single_module -weak_reference_mismatches non-weak -w -o
../../bin/x86_mac_gcc/plugins/python.pmc -ldylib1.10.5.o
-L../../bin/x86_mac_gcc/
-L/Developer/SDKs/MacOSX10.5.sdk/usr/lib/i686-apple-darwin10/4.2.1
-L/Developer/SDKs/MacOSX10.5.sdk/usr/lib
-L/usr/lib/gcc/i686-apple-darwin10/4.2.1
-L/usr/lib/gcc/i686-apple-darwin10/4.2.1
-L/Developer/SDKs/MacOSX10.5.sdk/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1
-L/Developer/SDKs/MacOSX10.5.sdk/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../..
-v -lpthread ../../lib/x86_mac_gcc_32/libiconv.2.2.0.dylib
obj/x86_mac_gcc_32/python.o32 obj/x86_mac_gcc_32/idaapi.o32 -lida
-install_name python.pmc -lpython2.6 -ldl -why_load
-search_paths_first -t -lstdc++ -lgcc_s.10.5 -lgcc -lSystem

正如你所看到的，-lida 出现在 -lSystem 之前，所以我希望ld首先选择 libida.dylib，但它没有发生：

dlopen(/home/test/build/bin/x86_mac_gcc/plugins/python.pmc): dlopen(/home/test/build/bin/x86_mac_gcc/plugins/python.pmc, 2): Symbol not found: _init_process
  Referenced from: /home/test/build/bin/x86_mac_gcc/plugins/python.pmc
  Expected in: /usr/lib/libSystem.B.dylib
 in /home/test/build/bin/x86_mac_gcc/plugins/python.pmc
/home/test/build/bin/x86_mac_gcc/plugins/python.pmc: can't load file

链接器的调试输出：

Library search paths:
    ../../bin/x86_mac_gcc/
    /Developer/SDKs/MacOSX10.5.sdk/usr/lib/i686-apple-darwin10/4.2.1
    /Developer/SDKs/MacOSX10.5.sdk/usr/lib
    /usr/lib/gcc/i686-apple-darwin10/4.2.1
    /usr/lib/gcc/i686-apple-darwin10/4.2.1
    /Developer/SDKs/MacOSX10.5.sdk/usr/lib/i686-apple-darwin10/4.2.1
    /Developer/SDKs/MacOSX10.5.sdk/usr/lib
    /usr/lib
    /usr/local/lib
Framework search paths:
    /Library/Frameworks/
    /System/Library/Frameworks/
/Developer/SDKs/MacOSX10.5.sdk/usr/lib/dylib1.10.5.o
/Developer/SDKs/MacOSX10.5.sdk/usr/lib/libpthread.dylib
../../lib/x86_mac_gcc_32/libiconv.2.2.0.dylib
obj/x86_mac_gcc_32/python.o32
obj/x86_mac_gcc_32/idaapi.o32
../../bin/x86_mac_gcc//libida.dylib
/usr/lib/libpython2.6.dylib
/Developer/SDKs/MacOSX10.5.sdk/usr/lib/libdl.dylib
/Developer/SDKs/MacOSX10.5.sdk/usr/lib/i686-apple-darwin10/4.2.1/libstdc++.dylib
/Developer/SDKs/MacOSX10.5.sdk/usr/lib/libgcc_s.10.5.dylib
/usr/lib/gcc/i686-apple-darwin10/4.2.1/libgcc.a
/Developer/SDKs/MacOSX10.5.sdk/usr/lib/libSystem.dylib
/usr/lib/system/libmathCommon.A.dylib
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1 回答 1

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解决了。罪魁祸首是-lpthread- libpthread 是 libSystem 的符号链接：

$ ls -la /Developer/SDKs/MacOSX10.5.sdk/usr/lib/libpthread.dylib
lrwxr-xr-x  1 root  wheel  15 Nov  9  2011 /Developer/SDKs/MacOSX10.5.sdk/usr/lib/libpthread.dylib -> libSystem.dylib

在 -lida 之后移动它后，一切都按预期工作。

于 2012-07-11T01:12:29.180 回答