Not sure how to fix this error:

/usr/bin/ld: /usr/bin/ld: DWARF error: invalid or unhandled FORM value: 0x25
Objects/floatobject.o: in function `PyFloat_Pack2':
floatobject.c:(.text.PyFloat_Pack2[PyFloat_Pack2]+0x32): undefined reference to `__truncdfhf2'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

CC @StanFromIreland (fuzzers)

The configure probe only tests a compile-time _Float16 constant, so it reports "yes" in the OSS-Fuzz Docker container where clang accepts the type but the container's pre-GCC-12 libgcc lacks __truncdfhf2 which is the runtime helper the PyFloat_Pack2 double to _Float16 conversion links against. I suggest you make configure do a runtime double to _Float16 conversion.

I suggest you make configure do a runtime double to _Float16 conversion.

Good idea, that works.

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