[Bug tree-optimization/86085] I/O built-ins considered argument clobbers

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86085

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
To make use of the Glibc printf hooks users have to disable the GCC built-ins. 
Otherwise the hooks might interfere with the sprintf optimization.