Re: [PATCH] Set behavior of sprintf-like functions with overlapping source and destination

[Siddhesh Poyarekar <siddhesh at gotplt dot org>]

On 31/12/18 11:16 PM, Joseph Myers wrote:
> Compat symbol semantics should be tested in the testsuite (with
> appropriate TEST_COMPAT conditionals and use of compat_symbol_reference).
> (There are exceptional cases where the new symbol's semantics are a
> refinement of the old and so the two symbol versions alias each other and
> no separate test of the old version is useful, but a new version is added
> to stop new binaries working with old libc - e.g. when some fenv.h
> functions changed from void to int return type following C99TC1 - but the
> normal case is that the compat symbols should be tested to ensure they
> keep working as expected.)

That's a good point, and something to keep in mind when we revive this 
discussion for 2.30.  For 2.29, do you agree that we should revert to 
old behaviour?

Siddhesh