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CubicLouve

Spring_MTの技術ブログです。https://github.com/SpringMT (http://spring-mt.tumblr.com/ からの移転)

macで共有ライブラリの依存関係を調べる

mysql2 gem を mysql5.6 の libmysqlclient.a と static link したい話 を読んでいて、macでも共有ライブラリの依存関係調べようとしたら、

zsh: command not found: ldd

lddの代わりにotoolコマンドを使う。

 % otool -L .rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/mysql2-0.3.17/lib/mysql2/mysql2.bundle
.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/mysql2-0.3.17/lib/mysql2/mysql2.bundle:
    /usr/local/lib/libmysqlclient.18.dylib (compatibility version 18.0.0, current version 18.0.0)
    /usr/lib/libssl.0.9.8.dylib (compatibility version 0.9.8, current version 50.0.0)
    /usr/lib/libcrypto.0.9.8.dylib (compatibility version 0.9.8, current version 50.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1197.1.1)
    /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)

otoolのオプションはこんな感じ。

-lとかも便利そう。

 % otool
Usage: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/otool [-arch arch_type] [-fahlLDtdorSTMRIHGvVcXmqQjC] [-mcpu=arg] [--version] <object file> ...
    -f print the fat headers
    -a print the archive header
    -h print the mach header
    -l print the load commands
    -L print shared libraries used
    -D print shared library id name
    -t print the text section (disassemble with -v)
    -p <routine name>  start dissassemble from routine name
    -s <segname> <sectname> print contents of section
    -d print the data section
    -o print the Objective-C segment
    -r print the relocation entries
    -S print the table of contents of a library
    -T print the table of contents of a dynamic shared library
    -M print the module table of a dynamic shared library
    -R print the reference table of a dynamic shared library
    -I print the indirect symbol table
    -H print the two-level hints table
    -G print the data in code table
    -v print verbosely (symbolically) when possible
    -V print disassembled operands symbolically
    -c print argument strings of a core file
    -X print no leading addresses or headers
    -m don't use archive(member) syntax
    -B force Thumb disassembly (ARM objects only)
    -q use llvm's disassembler (the default)
    -Q use otool(1)'s disassembler
    -mcpu=arg use `arg' as the cpu for disassembly
    -j print opcode bytes
    -C print linker optimization hints
    --version print the version of /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/otool