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from 91bac9fed5d libstdc++: Fix range access for empty std::valarray [PR103022] new bd5e882cf6e diagnostics: escape non-ASCII source bytes for certain diagnostics

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Summary of changes: gcc/c-family/c-lex.c | 6 +- gcc/common.opt | 13 + gcc/diagnostic-format-json.cc | 3 + gcc/diagnostic-show-locus.c | 580 ++++++++++++++++++--- gcc/diagnostic.c | 10 +- gcc/diagnostic.h | 18 + gcc/doc/invoke.texi | 43 +- gcc/input.c | 62 ++- gcc/input.h | 7 +- gcc/opts.c | 4 + gcc/selftest.c | 15 + gcc/selftest.h | 2 + .../c-c++-common/diagnostic-format-json-1.c | 1 + .../c-c++-common/diagnostic-format-json-2.c | 1 + .../c-c++-common/diagnostic-format-json-3.c | 1 + .../c-c++-common/diagnostic-format-json-4.c | 2 + .../c-c++-common/diagnostic-format-json-5.c | 1 + gcc/testsuite/gcc.dg/cpp/warn-normalized-4-bytes.c | 21 + .../gcc.dg/cpp/warn-normalized-4-unicode.c | 19 + gcc/testsuite/gcc.dg/encoding-issues-bytes.c | Bin 0 -> 595 bytes gcc/testsuite/gcc.dg/encoding-issues-unicode.c | Bin 0 -> 613 bytes .../gfortran.dg/diagnostic-format-json-1.F90 | 1 + .../gfortran.dg/diagnostic-format-json-2.F90 | 1 + .../gfortran.dg/diagnostic-format-json-3.F90 | 1 + libcpp/charset.c | 63 ++- libcpp/errors.c | 82 ++- libcpp/include/cpplib.h | 76 ++- libcpp/include/line-map.h | 13 + libcpp/internal.h | 23 + libcpp/lex.c | 38 +- libcpp/line-map.c | 3 +- 31 files changed, 942 insertions(+), 168 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/cpp/warn-normalized-4-bytes.c create mode 100644 gcc/testsuite/gcc.dg/cpp/warn-normalized-4-unicode.c create mode 100644 gcc/testsuite/gcc.dg/encoding-issues-bytes.c create mode 100644 gcc/testsuite/gcc.dg/encoding-issues-unicode.c