--size_t-is-usize not working if the function is named malloc

[Dirbaio]

Input C/C++ Header

#include <stddef.h>
void* malloc(size_t size);

which reduces to this:

typedef long unsigned int size_t;
void* malloc(size_t size);

Bindgen Invocation

bindgen --size_t-is-usize test.h -o test.rs  --dump-preprocessed-input

Actual Results

/* automatically generated by rust-bindgen */

extern "C" {
    pub fn malloc(size: ::std::os::raw::c_ulong) -> *mut ::std::os::raw::c_void;
}

Expected Results

I'd expect that if --size_t-is-usize, then the function would take an usize instead of a raw::c_ulong.
The --size_t-is-usize seems to be ignored in this case?

[emilio]

Huh, that sure is odd. I think clang is messing with us on this one, it works if you change the name of the function to malloc1 or such. lol

[pvdrz]

I think this is because clang performs a bunch of optimizations for built in functions. If you pass -- -fno-builtin to bindgen the output is the expected one

/* automatically generated by rust-bindgen 0.63.0 */

extern "C" {
    pub fn malloc(size: usize) -> *mut ::std::os::raw::c_void;
}