Bindgen skips macros with token concatenation.

[TranquilRock]

Input C/C++ Header

# define UL(x) x##UL
# define A UL(4294967295)
# define B 4294967295UL

Bindgen Invocation

$ bindgen input.h

Actual Result

/* automatically generated by rust-bindgen 0.59.1 */

pub const B: u32 = 4294967295;

Expected Results

/* automatically generated by rust-bindgen 0.59.1 */

pub const A: u32 = 4294967295;
pub const B: u32 = 4294967295;

Ref

• https://gcc.gnu.org/onlinedocs/cpp/Concatenation.html

[K900]

I'm pretty sure it's not just token concatenation - any invocation of a macro in a #define seems ignored, even something as simple as

#define WRAP(v) v
#define WRAPPED WRAP(1)
#define NOT_WRAPPED 2

[K900]

Actually looks like this is just a subset of #753

[pvdrz]

yeah this happens just because we don't know how to process function-like macros. Closing as a duplicate of #753

[oToToT]

The bindgen output of the C code below

#define A 1 ## 2
#define B 2

is

/* automatically generated by rust-bindgen 0.61.0 */

pub const B: u32 = 2;

IIUC, it doesn't seem to be included in #753.

[jbaublitz]

@oToToT The newest bindgen release includes work that resolves this issue despite not being included in the issue. I just tested with the newest bindgen and this syntax is handled with the --clang-macro-fallback flag.

[pvdrz]

Closed via #2779