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As noted in bug 95630, C11 removed a restriction in C99 on comparing pointers to compatible complete and incomplete types (this was one of the changes in N1439, which was largely a terminological change to make incomplete types a subset of object types rather than a different kind of type). Implement that change by using pedwarn_c99 with OPT_Wpedantic for this diagnostic. Bootstrapped with no regressions for x86_64-pc-linux-gnu. gcc/c/ 2020-11-23 Joseph Myers <joseph@codesourcery.com> PR c/95630 * c-typeck.c (build_binary_op): Use pedwarn_c99 with OPT_Wpedantic for comparisons of complete and incomplete pointers. gcc/testsuite/ 2020-11-23 Joseph Myers <joseph@codesourcery.com> PR c/95630 * gcc.dg/c11-compare-incomplete-1.c, gcc.dg/c11-compare-incomplete-2.c, gcc.dg/c99-compare-incomplete-1.c, gcc.dg/c99-compare-incomplete-2.c: New tests.
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