c - 我如何告诉 gcc 不要内联函数？

Question

假设我在源文件中有这个小函数

static void foo() {}

并且我构建了我的二进制文件的优化版本，但我不想内联此函数(出于优化目的)。我可以在源代码中添加一个宏来防止内联吗？

Answer 1

您需要特定于 gcc 的 noinline属性。

This function attribute prevents a function from being considered for inlining. If the function does not have side-effects, there are optimizations other than inlining that causes function calls to be optimized away, although the function call is live. To keep such calls from being optimized away, put asm ("");

像这样使用它:

void __attribute__ ((noinline)) foo() 
{
  ...
}