What are Linker Symbols __TMC_END__ and __TMC_LIST__ for?

Question

I've asked this SO question and stumbled across the __TMC_END__ symbol that seems to be generated by the linker. I don't know what it's purpose is and the only useful reference to it is this bug which doesn't explain much about why it is there. The but does however, make a reference to a similar symbol __TMC_LIST__.

Does anybody know what these are used for?

Answer 1

Doing more searching I've come across this bit of code that suggests that these symbols are to do with the tm_clone_table which I've understood to have something to do with transactional memory. Following the bread crumbs lead me to this GCC Wiki explanation.