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9783f6f2f6
Since the standard library doesn't preclude an #include of a standard library header from bringing in declarations from other headers, we can translate an #include of any of the importable headers as an import of <bits/stdc++.h>. To reduce the amount of C++ standard knowledge encoded in libcpp, I extend the translate_include callback to allow it to suggest an alternate header to try translating. It's a bit awkward to bounce back and forth, but this seems like the right division of responsibilities. libcpp/ChangeLog: * include/cpplib.h (struct cpp_callbacks): Replace 'path' parameter with file, angle_brackets, and alternate name. (cpp_get_name): Declare. * files.cc (cpp_get_name): New. (_cpp_stack_include, _cpp_post_stack_file, _cpp_stack_file) (_cpp_stack_translated_file): Refactor, try alternate file. gcc/cp/ChangeLog: * module.cc (maybe_translate_include): Suggest <bits/stdc++.h> as an alternate for importable standard library headers. (importable_headers, is_importable_header): New. gcc/ChangeLog: * doc/invoke.texi (C++ Modules): Remove standard library header units from missing pieces, mention importable header redirection. gcc/testsuite/ChangeLog: * g++.dg/modules/compile-std1.C: Test <vector> translation.