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Rely on compiler support for _Float16 and __bf16 to support -fH and -fB formats respectively. I.e. IEEE 16 bit, and brain 16 bit floats respectively. Modern GCC and LLVM compilers support both types. clang-sect=half-precision-floating-point https://gcc.gnu.org/onlinedocs/gcc/Half-Precision.html https://clang.llvm.org/docs/LanguageExtensions.html#$clang-sect https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0192r4.html https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1467r9.html This was tested on: gcc 13, clang 17 x86 (Both types supported) gcc 7 aarch64 (Only -fH supported) gcc 13 ppc(be) (Neither supported. Both will be with GCC 14) * src/od.c: Support -tf2 or -tfH to print IEEE 16 bit floating point, or -tfB to print Brain 16 bit floating point. * configure.ac: Check for _Float16 and __bf16 types. * doc/coreutils.texi (od invocation): Mention the new -f types. * tests/od/od-float.sh: Add test cases. * NEWS: Mention the new feature. Addresses https://bugs.gnu.org/68871