Is there a .def file equivalent on Linux for controlling exported function names in a shared library?

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独厮守ぢ
独厮守ぢ 2021-01-31 12:04

I am building a shared library on Ubuntu 9.10. I want to export only a subset of my functions from the library. On the Windows platform, this would be done using a module defini

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  • 2021-01-31 12:14

    How can I restrict the exported functions of a shared library to those I want (i.e. a .def file equivalent)

    Perhaps you're looking for GNU Export Maps or Symbol Versioning

    g++ -shared spaceship.cpp -o libspaceship.so.1 -Wl,-soname=libspaceship.so.1 -Wl, --version-script=spaceship.expmap

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  • 2021-01-31 12:14

    gcc also supports the VC syntax of __declspec(dllexport). See this.

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  • 2021-01-31 12:16

    The most common way to only make certain symbols visible in a shared object on linux is to pass the -fvisibility=hidden to gcc and then decorate the symbols that you want to be visible with __attribute__((visibility("default"))).

    If your looking for an export file like solution you might want to look at the linker option --retain-symbols-file=FILENAME which may do what you are looking for.

    I don't know an easy way of exporting a function with a different name from its function name, but it is probably possible with an elf editor. Edit: I think you can use a linker script (have a look at the man page for ld) to assign values to symbols in the link step, hence giving an alternative name to a given function. Note, I haven't ever actually tried this.

    To view the visible symbols in a shared object you can use the readelf command. readelf -Ds if I remember correctly.

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  • 2021-01-31 12:26

    Another option is to use the strip command with this way:

    strip --keep-symbol=symbol_to_export1 --keep-symbol=symbol_to_export2 ... \
         libtotrip.so -o libout.so
    
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