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* c-opts.c (c_common_post_options): PCH is not compatible with no-unit-at-a-time. * opts.c (handle_options): Enable unit-at-a-time at O0 along with -fno-toplevel-reorder by default now. * gcc.dg/weak/weak-2.c: We no longer complain about incompatibilty. * gcc.dg/weak/weak-3.c: We no longer complain about incompatibilty. * gcc.dg/weak/weak-4.c: We no longer complain about incompatibilty. * gcc.dg/weak/weak-5.c: We no longer complain about incompatibilty. * gcc.dg/weak/weak-6.c: Fix thinko in previous change. * gcc.dg/weak/weak-7.c: Likewise. From-SVN: r136903
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