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[RFC] warn on dead function calls in ipa-pure-const [1/4]


Hi,
The attached patch emits warnings for functions found to be pure or
const by the ipa-pure-const
pass. It does not warn for functions with unused return values that
have been declared
as pure or const by the user since this is already handled in C and C++ FE's.
I have split it into parts to individually address fallouts observed
during bootstrap+test.
I still have to add more test-cases. Apart from that does the patch look OK  ?

Thanks,
Prathamesh

Attachment: patch-1.diff
Description: Text document


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