什么是等效于“gcc -fvisibility=hidden"的 CMake?控制共享库的导出符号时? [英] What is the CMake equivalent to "gcc -fvisibility=hidden" when controlling the exported symbol of a shared library?

问题描述

我用 C++ 开发了跨平台软件.据我所知，Linux .so 默认导出所有符号，通过 "gcc -fvisibility=hidden" 我可以将所有导出的符号设置为隐藏，然后设置 __attribute__(visibility("default")) 用于我要导出的类和函数，以便我可以控制要导出的内容.

I developed cross platform software in c++. As I know, Linux .so exported all the symbols by default, well through "gcc -fvisibility=hidden" I can set all the exported symbols as hidden, then set __attribute__(visibility("default")) for the class and function I want to export, so I can control what I want to export.

我的问题是，使用 CMake，我如何将工作作为gcc -fvisibility=hidden"控件来完成?

My question is, using CMake, how can I do the work as "gcc -fvisibility=hidden" control?

推荐答案

您应该使用当前的 CMake 版本和 <LANG>_VISIBILITY_PRESET 属性.通过这种方式，您可以避免 CMakeLists 中的编译器细节并提高跨平台适用性(避免错误，例如支持 GCC 而不是 Clang).

Instead of setting compiler flags directly, you should be using a current CMake version and the <LANG>_VISIBILITY_PRESET properties instead. This way you can avoid compiler specifics in your CMakeLists and improve cross platform applicability (avoiding errors such as supporting GCC and not Clang).

即，如果您使用的是 C++，您要么调用set(CMAKE_CXX_VISIBILITY_PRESET hidden) 全局设置属性，或 set_target_properties(MyTarget PROPERTIES CXX_VISIBILITY_PRESET hidden) 将设置限制为特定库或可执行目标.如果您使用 C，只需在上述命令中将 CXX 替换为 C.您可能还想调查 VISIBLITY_INLINES_HIDDEN 属性.

I.e., if you are using C++ you would either call set(CMAKE_CXX_VISIBILITY_PRESET hidden) to set the property globally, or set_target_properties(MyTarget PROPERTIES CXX_VISIBILITY_PRESET hidden) to limit the setting to a specific library or executable target. If you are using C just replace CXX by C in the aforementioned commands. You may also want to investigate the VISIBLITY_INLINES_HIDDEN property as well.

GENERATE_EXPORT_HEADER 的文档包含更多提示以及与这两个属性相关的示例.

The documentation for GENERATE_EXPORT_HEADER includes some more tips and examples related to both properties.

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