jextract can fail if a C header file have a typedef that collides with the java.lang classes on a primitive type.

For example, with following C header,

typedef char Byte;
void func(Byte byte, Byte* out);

jextract would spit out a function like following,

public void func(byte byte$, Pointer<Byte> out);

and an annotation class for typedef,

public static @interface Byte {}

This will cause compilation errors on the static-forwarder or user code.

The immediate thought would be trying to use --exclude-symbol to filter out Byte, but that doesn't work because symbol filter doesn't apply to typedef.