On Mon, 2 Oct 2017, Martin Sebor wrote: > IMO, a reasonable question a GCC user might ask is: when I make > a call to a standard library function via __builtin_foo() in > a language conformance mode where foo is not a standard function, > can I expect GCC to transform it to some equivalent call to > a function that is defined by the standard (or expand it inline)? > I don't know what the answer should be, but whatever we might > want it to be, it seems worth documenting.
It may transform it, but is not required to do so; calling foo is also OK. <https://gcc.gnu.org/ml/gcc-patches/2014-12/msg00409.html> has my analysis of what I think is correct in this area (which may not be the same as what is currently implemented). -- Joseph S. Myers jos...@codesourcery.com
