| __USER_LABEL_PREFIX__

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This macro expands to a single token which is the prefix applied to user labels (symbols visible to C code) in assembly. For example, in the `m68k-aout` environment it expands to an `_`, but in the `m68k-coff` environment (as TIGCC is) it expands to nothing.
This macro will have the correct definition even if '-f(no-)underscores' is in use, but it will not be correct if target-specific options that adjust this prefix are used (e.g. the OSF/rose '-mno-underscores' option).