javed.absar added a comment.

Hi Nico:
This is for the case when using  '#pragma bss_seg..' feature outside of msvc 
context. That's the reason for the flag.
One could use attribute, but as attribute is attached to individual 
declaration, while pragma applies to whole file (unless superseded by another 
pragma),  the latter is easier to use in some cases (i.e. when there are lots 
of such declarations). Hope this clarifies the question you asked.
Best Regards
Javed


https://reviews.llvm.org/D30326



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