How to write multiline errorformat string?

I want to write OpenCL syntax checker for vim-opencl plugin. OpenCL compiler do some strange formatting of output errors. There are two types of errors.

Normal (with small error explanation):

"/tmp/OCLUKvOsF.cl", line 143: error: expression must have integral type
        rec_table[PRIME_P - ri] = PRIME_P - i;
                  ^

And not-normal with line-break in error explanation:

"/tmp/OCLUKvOsF.cl", line 148: error: a value of type "uint16" cannot be used
          to initialize an entity of type "uint"
    uint a = value, b = PRIME_P, u = 0, v = 0;
             ^

So trouble is in concatenation of two parts of broken error explanation in second case and normal error handling in first case.

I'm using syntastic as generel syntax checker. Now I have such code for it:

let errorformat = '%E"%f"\, line %l: error: %m,%+C%.%#,%-Z%p^,'.
                  \'%W"%f"\, line %l: warning: %m,%-C%.%#,'.
                  \'%-G%.%#'

So first and second errors look following:

program.cl|143 error| expression must have integral type rec_table[PRIME_P - ri] = PRIME_P - i; ^
program.cl|148 col 14 error| a value of type "uint16" cannot be used to initialize an entity of type "uint" uint a = value, b = PRIME_P, u = 0, v = 0;

It almost ok (especially in second case), but I don't know how to make it like this:

program.cl|143 col 19 error| expression must have integral type
program.cl|148 col 14 error| a value of type "uint16" cannot be used to initialize an entity of type "uint"

Or at least like this:

program.cl|143 col 19 error| expression must have integral type rec_table[PRIME_P - ri] = PRIME_P - i;
program.cl|148 col 14 error| a value of type "uint16" cannot be used to initialize an entity of type "uint" uint a = value, b = PRIME_P, u = 0, v = 0;

Do you have some idea?

UPD. Updated errorformat and expectations

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