In function ‘copy2’,
    inlined from ‘format_decimal’ at /local/1/home/build/gcc/_deps/fmt-src/include/fmt/format.h:1124:8,
    inlined from ‘format_decimal’ at /local/1/home/build/gcc/_deps/fmt-src/include/fmt/format.h:1134:28,
    inlined from ‘write.constprop’ at /local/1/home/build/gcc/_deps/fmt-src/include/fmt/chrono.h:1663:36:
/local/1/home/build/gcc/_deps/fmt-src/include/fmt/format.h:1090:11: error: writing 2 bytes into a region of size 0 [-Werror=stringop-overflow=]
 1090 |     memcpy(dst, src, 2);
      |           ^
/local/1/home/build/gcc/_deps/fmt-src/include/fmt/chrono.h: In member function ‘write.constprop’:
/local/1/home/build/gcc/_deps/fmt-src/include/fmt/format.h:1133:8: note: at offset -2 to object ‘buffer’ with size 10 declared here
 1133 |   Char buffer[digits10<UInt>() + 1];
      |        ^
In function ‘format_decimal’,
    inlined from ‘format_decimal’ at /local/1/home/build/gcc/_deps/fmt-src/include/fmt/format.h:1134:28,
    inlined from ‘write.constprop’ at /local/1/home/build/gcc/_deps/fmt-src/include/fmt/chrono.h:1663:36:
/local/1/home/build/gcc/_deps/fmt-src/include/fmt/format.h:1120:12: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
 1120 |     *--out = static_cast<Char>('0' + value);
      |            ^
/local/1/home/build/gcc/_deps/fmt-src/include/fmt/chrono.h: In member function ‘write.constprop’:
/local/1/home/build/gcc/_deps/fmt-src/include/fmt/format.h:1133:8: note: at offset -1 to object ‘buffer’ with size 10 declared here
 1133 |   Char buffer[digits10<UInt>() + 1];