optimize attribute ignored by clang 11

[dpotop]

Hello,

I'm using clang 11.0.0 (MacOSX Xcode build).
The following code:
__attribute__((optimize("-O0"))) int bench_fun() { return 0 ; }
gives the following warning:

try.c:26:16: warning: unknown attribute 'optimize' ignored [-Wunknown-attributes]

Is this a bug, or a feature? If it's a feature, how can I obtain the same effect?

Best regards,
dpotop

[tclin914]

It looks like that clang doesn't support this function attribute.
Do you have tried other versions of clang?
If you expect the function without any optimization, you can use __attribute__(optnone)

[dpotop]

Thanks tclin914. optnone seems to work. Too bad, however, that the general attribute "optimize" does not work, for compatibility with gcc.