re PR c/24293 (Undefined behaviour not diagnosed with -fsyntax-only)

re PR c/24293 (Undefined behaviour not diagnosed with -fsyntax-only)

2016-01-15  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

        PR c/24293
        * c-tree.h (incomplete_record_decls): Declare.
        * c-parser.c (incomplete_record_decls): Define.
        (c_parser_translation_unit): Iterate through incomplete_record_decls and
        report error if any decl has zero size.
        * c-decl.c (finish_decl): Append static decl with incomplete struct/union
        or enum type to incomplete_record_decls.

testsuite/
        * gcc.dg/pr24293.c: New test.
        * gcc.dg/Wcxx-compat-8.c: Adjust to accept error due to
        incomplete struct type.
        * gcc.dg/declspec-1.c: Likewise.
        * gcc.dg/pr63549.c: Likewise.

From-SVN: r232622