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gcc/cp PR c++/17577: * lex.c (handle_pragma_implementation): Use cpp_included_before. gcc/testsuite PR c++/17577: * g++.dg/ext/pr17577.h: New file. * g++.dg/ext/pr17577.C: New file. libcpp PR c++/17557: * include/cpplib.h (cpp_included_before): Declare. * files.c (struct file_hash_entry) <location>: New field. (_cpp_find_file): Initialize new field. (make_cpp_dir): Likewise. (cpp_included_before): New function. From-SVN: r130093
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