Comment 1:

linux/amd64 hg id 11611373ac8a tip
$ ./run
float: 42.00

Comment 2:

Labels changed: added cgo.

Owner changed to @rsc.

Status changed to Accepted.

Comment 3:

A little mind dump:
After adding the __rodata section to the output file, it seems to almost work.
(https://gist.github.com/901976)
However, the addends that are calculated for relocations of what was previously the
__literal8 section are wrong.  I tried to ignore the addend for these cases (explicitly
zero it), but this just makes it always reference the first float value.
Also, the symnum of the relocation points to the __literal8 section and not a particular
symbol, so I'm guessing that the addend in this case should be the offset into the
__literal8 section, somehow...

Comment 4:

OK, the reason it references a section and not a symbol is that rel->extrn == 0.   I
guess that case isn't handled correctly in the linker?
/usr/include/mach-o/x86_64/reloc.h has this to say about the relocations that accessing
__literal8 data generates:
       lea L0(%rip), %rax
               r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=0, r_pcrel=1, r_symbolnum=3
               48 8d 05 56 00 00 00
               // assumes L0 is in third section and there is no previous non-local label.
               // The rip-relative-offset of 0x00000056 is L0-address_of_next_instruction.
               // address_of_next_instruction is the address of the relocation + 4.

Comment 5:

This issue was closed by revision 2aceea6.

Status changed to Fixed.