ISO C violation (really -- style & string pasting)

[Martin v. Loewis]

> The easy fix to this is to use a #define and (ISO) string-pasting.
> However, I suspect the style rules disallow string-pasting.

I have problems understanding how this fixes the problem (and probably
what the problem is). The symbol _GLOBAL_OFFSET_TABLE_ only appears in
assembler files, right? And it would only collide with a symbol of the
same name appearing in application source code, right? How can you
solve this conflict with the preprocessor?

Curious,
Martin