built-in functions

[Segher Boessenkool]

On Mon, Sep 14, 2015 at 11:11:21AM -0300, Bruno Schneider wrote:
> I'm trying to compile C++ code with the built-in "add with oveflow
> check" functions[1]. But the compiler complains the built-ins have not
> been declared. I'm using g++ 4.9.2.

You need GCC 5 or later for those builtins.

> [1] https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html

That is the documentation for the latest released version of the compiler.
onlinedocs/gcc-4.9.2/gcc/ etc. for your specific version.


Segher