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User-Agent: Mozilla/4.6C-CCK-MCD EMS-1.4 [en] (X11; U; SunOS 5.6 sun4m)


gcc gives a warning "incompatible pointer type" when passing a char **
to a function where the argument is of type "const char * const *".
gcc will allow the top level to become const without complaint (that is,
passing (const char **) is perfectly acceptable).  It seems that gcc should
scan down through the type and allow const to be added at all levels during
argument passing.

Reproducible: Always
Steps to Reproduce:
1.Compile the following program:
const char f(const char * const * p) {
        return **p;
}

void g(void) {
char *v = "testing";
char **q = &v;

        f( q );                 /* gives error */
        f( (const char **)q );  /* OK */
}


Actual Results:  gcc version 2.95.2 19991024 (release) gives:
x.c:9: warning: passing arg 1 of 'f' from incompatible pointer type


Expected Results:  clean compile