3adb9cb9af
* c-decl.c (finish_function): Warn about a non-void function with
no return statement and no abnormal exit.
(current_function_returns_abnormally): New variable.
(start_function): Clear it.
(struct c_language_function): Add returns_abnormally.
(push_c_function_context): Save it.
(pop_c_function_context): Restore it.
(builtin_function): Set TREE_THIS_VOLATILE on return fns.
(grokdeclarator): Set C_FUNCTION_IMPLICIT_INT on functions without
an explicit return type.
* c-tree.h: Declare current_function_returns_abnormally.
(C_FUNCTION_IMPLICIT_INT): New macro.
* c-typeck.c (build_function_call): Set it.
(c_expand_return): Set current_function_returns_value even if the
value is erroneous.
From-SVN: r49579
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