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As reported in bug 112556, GCC wrongly rejects conversion of null pointer constants with bool or enum type to pointers in convert_for_assignment (assignment, initialization, argument passing, return). Fix the code there to allow BOOLEAN_TYPE and ENUMERAL_TYPE; it already allowed INTEGER_TYPE and BITINT_TYPE. This bug (together with -std=gnu23 meaning false has type bool rather than int) has in turn resulted in people thinking they need to fix code using false as a null pointer constant for C23 compatibility. While such a usage is certainly questionable, it has nothing to do with C23 compatibility and the right place for warnings about such usage is -Wzero-as-null-pointer-constant. I think it would be appropriate to extend -Wzero-as-null-pointer-constant to cover BOOLEAN_TYPE, ENUMERAL_TYPE and BITINT_TYPE (in all the various contexts in which that option generates warnings), though this patch doesn't do anything about that option. Bootstrapped with no regressions for x86-64-pc-linux-gnu. PR c/112556 gcc/c/ * c-typeck.cc (convert_for_assignment): Allow conversion of ENUMERAL_TYPE and BOOLEAN_TYPE null pointer constants to pointers. gcc/testsuite/ * gcc.dg/c11-null-pointer-constant-1.c, gcc.dg/c23-null-pointer-constant-1.c: New tests. |
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