Spurious (?) warning about string constants using a macro in OpenCL -

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i use following macro in opencl kernel:

#define ided_printf(_format, ...) printf("(%u,%u,%u) " _format, get_global_id(0), get_group_id(0), get_local_id(0), __va_args__ )

and works fine. however, when compile (i use amd's app opencl library on win7), following warning on each use of macro:

argument of type "const __constant char *" incompatible parameter of type "__constant char *"

why getting that? after all, string literals const's. , if opencl compiler doesn't make them const, why "(%u, %u, %u)" string const'ed while other string (_format) not consted?

i'm assuming compiler bug; if is, workaround appreciated. maybe sort of cast?

based on amd forum's post, bug. , yes cast suggested in same post:

printf((__constant char *)"%d\n", i);

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