On Sat, Apr 22, 2017 at 07:57:17PM +0200, Patrick Dupre wrote:
> Hello,
> 
> I would like that gcc generates an error (and not a warning),
> when there is a call to a non predeclared function.

In C?  -Werror=implicit-function-declaration or -pedantic-errors (if in c99
or later mode, which is the default).  In C++ you always get an error about
that.

        Jakub
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