下面的代码在GCC中编译，但不是在Clang中编译： #include< cstring>
constexpr int test = strcmp（test，test）;
所以我的问题是，GCC如何处理strcmp以使其成为可能？ strcmp是一些内置的类型，还是它的标准库有一个非标准的strcmp定义，包括constexpr？
代码在gcc上编译，因为它提供了一个 <$假设你将字符串文字传递给函数，在编译时计算c $ c> strcmp 。
gcc会拒绝密码如果你通过 -fno-builtin （或 -fno-builtin-strcmp ）标志。
The following compiles in GCC but not in Clang:
#include <cstring>
constexpr int test = strcmp("test", "test");
So my question is, how does GCC handle strcmp differently to make this possible? Is strcmp some type of builtin, or does its standard library have a non-standard definition of strcmp that includes constexpr?
The code compiles on gcc because it provides a built-in version of strcmp that is evaluated at compile time, assuming you pass string literals to the function.
gcc will reject the code if you pass the -fno-builtin (or -fno-builtin-strcmp) flag.
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