The test g++.dg/abi/key2.C fails on darwin for trunk and the gcc8 branch due the warning
/opt/gcc/_clean/gcc/testsuite/g++.dg/abi/key2.C: In function 'int sub()': /opt/gcc/_clean/gcc/testsuite/g++.dg/abi/key2.C:17:2: warning: no return statement in function returning non-void [-Wreturn-type] 17 | {} This is fixed by the following patch: --- ../_clean/gcc/testsuite/g++.dg/abi/key2.C 2016-11-27 16:57:37.000000000 +0100 +++ gcc/testsuite/g++.dg/abi/key2.C 2018-12-28 14:49:09.000000000 +0100 @@ -14,4 +14,4 @@ class f } c; inline void f::g() {} int sub(void) -{} +{return 0;} Committed as obvious on trunk and the gcc8 branch. Dominique