c++ - passing argument 2 of 'memcpy' discards 'volatile' qualifier from pointer target type -

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i have volatile char * start_address; pointing register sections (might change due hardware behavior). need read , using:

memcpy (     result_p,            // starting address of destination     start_address,       // starting address of source     result_len           // length of payload );

i getting warning:

passing argument 2 of 'memcpy' discards 'volatile' qualifier pointer target type

is safer way read sections or better way use memcpy , prevent warning?

memcpy incompatible volatile objects, , mismatched pointer type in function signature helping point out you. memcpy may copy in order, in unit size, read parts of source multiple times, write parts of destination multiple times, etc. on other hand, volatile expresses intent sequence , number of accesses object must in abstract machine. if want copy volatile arrays, need write own copy loop looks naive memcpy, , use right volatile type pointer in loop.


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