__attribute__(weak)
时间: 2023-11-05 16:17:39 浏览: 63
__attribute__((weak))是一个GCC编译器的特性,用于声明函数或变量为弱符号引用。在使用该特性时,可以在调用某个模块的函数时,即使该函数在该模块中未定义也不会报重复定义的错误。
举个例子,如果在模块A中调用了模块B的函数,但是模块B的函数可能未定义,可以在模块A中使用__attribute__((weak))来声明需要调用的函数为弱符号引用。这样,在模块A的代码中,可以通过检查该函数的指针是否为NULL来判断该函数是否存在,从而避免因为函数未定义而导致的错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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