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* common.opt: Add -foptimize-strlen option. * Makefile.in (OBJS): Add tree-ssa-strlen.o. (tree-sssa-strlen.o): Add dependencies. * opts.c (default_options_table): Enable -foptimize-strlen by default at -O2 if not -Os. * passes.c (init_optimization_passes): Add pass_strlen after pass_object_sizes. * timevar.def (TV_TREE_STRLEN): New timevar. * params.def (PARAM_MAX_TRACKED_STRLENS): New parameter. * tree-pass.h (pass_strlen): Declare. * tree-ssa-strlen.c: New file. * c-decl.c (merge_decls): If compatible stpcpy prototype is seen, set implicit_built_in_decls[BUILT_IN_STPCPY]. cp/ * decl.c (duplicate_decls): If compatible stpcpy prototype is seen, set implicit_built_in_decls[BUILT_IN_STPCPY]. testsuite/ * gcc.dg/strlenopt-1.c: New test. * gcc.dg/strlenopt-1f.c: New test. * gcc.dg/strlenopt-2.c: New test. * gcc.dg/strlenopt-2f.c: New test. * gcc.dg/strlenopt-3.c: New test. * gcc.dg/strlenopt-4.c: New test. * gcc.dg/strlenopt-4g.c: New test. * gcc.dg/strlenopt-4gf.c: New test. * gcc.dg/strlenopt-5.c: New test. * gcc.dg/strlenopt-6.c: New test. * gcc.dg/strlenopt-7.c: New test. * gcc.dg/strlenopt-8.c: New test. * gcc.dg/strlenopt-9.c: New test. * gcc.dg/strlenopt-10.c: New test. * gcc.dg/strlenopt-11.c: New test. * gcc.dg/strlenopt-12.c: New test. * gcc.dg/strlenopt-12g.c: New test. * gcc.dg/strlenopt-13.c: New test. * gcc.dg/strlenopt-14g.c: New test. * gcc.dg/strlenopt-14gf.c: New test. * gcc.dg/strlenopt-15.c: New test. * gcc.dg/strlenopt-16g.c: New test. * gcc.dg/strlenopt-17g.c: New test. * gcc.dg/strlenopt-18g.c: New test. * gcc.dg/strlenopt.h: New file. From-SVN: r179279
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