https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896
Sean <s...@rogue-research.com> changed:
What |Removed |Added
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CC| |s...@rogue-research.com
--- Comment #49 from Sean <s...@rogue-research.com> ---
>>will you support expressions:
>>
>>struct P {
>> int k;
>> int x[.k * 4];
>>}
>
>Maybe the size expressions should be limited to very simple
>expressions without side effects.
Simple expressions without side effects would be useful for libusb, whose
public API has structures like:
struct libusb_bos_dev_capability_descriptor {
/** Size of this descriptor (in bytes) */
uint8_t bLength;
uint8_t other1;
uint8_t other2;
/** Device Capability data (bLength - 3 bytes) */
uint8_t dev_capability_data[];
};
Here it seems we'd want to tag it with __attribute__((__element_count__(bLength
- 3)));
See
https://github.com/libusb/libusb/blob/37dee8f9dd429558e4d5bc4a804ab586abe7262a/libusb/libusb.h#L859C1-L859C51
