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Adds the logic to handle -finput-charset in layout_get_source_line(), so that source lines are converted from their input encodings prior to being output by diagnostics machinery. Also adds the ability to strip a UTF-8 BOM similarly. gcc/c-family/ChangeLog: PR other/93067 * c-opts.c (c_common_input_charset_cb): New function. (c_common_post_options): Call new function diagnostic_initialize_input_context(). gcc/d/ChangeLog: PR other/93067 * d-lang.cc (d_input_charset_callback): New function. (d_init): Call new function diagnostic_initialize_input_context(). gcc/fortran/ChangeLog: PR other/93067 * cpp.c (gfc_cpp_post_options): Call new function diagnostic_initialize_input_context(). gcc/ChangeLog: PR other/93067 * coretypes.h (typedef diagnostic_input_charset_callback): Declare. * diagnostic.c (diagnostic_initialize_input_context): New function. * diagnostic.h (diagnostic_initialize_input_context): Declare. * input.c (default_charset_callback): New function. (file_cache::initialize_input_context): New function. (file_cache_slot::create): Added ability to convert the input according to the input context. (file_cache::file_cache): Initialize the new input context. (class file_cache_slot): Added new m_alloc_offset member. (file_cache_slot::file_cache_slot): Initialize the new member. (file_cache_slot::~file_cache_slot): Handle potentially offset buffer. (file_cache_slot::maybe_grow): Likewise. (file_cache_slot::needs_read_p): Handle NULL fp, which is now possible. (file_cache_slot::get_next_line): Likewise. * input.h (class file_cache): Added input context member. libcpp/ChangeLog: PR other/93067 * charset.c (init_iconv_desc): Adapt to permit PFILE argument to be NULL. (_cpp_convert_input): Likewise. Also move UTF-8 BOM logic to... (cpp_check_utf8_bom): ...here. New function. (cpp_input_conversion_is_trivial): New function. * files.c (read_file_guts): Allow PFILE argument to be NULL. Add INPUT_CHARSET argument as an alternate source of this information. (read_file): Pass the new argument to read_file_guts. (cpp_get_converted_source): New function. * include/cpplib.h (struct cpp_converted_source): Declare. (cpp_get_converted_source): Declare. (cpp_input_conversion_is_trivial): Declare. (cpp_check_utf8_bom): Declare. gcc/testsuite/ChangeLog: PR other/93067 * gcc.dg/diagnostic-input-charset-1.c: New test. * gcc.dg/diagnostic-input-utf8-bom.c: New test.
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