On Thu, 23 Nov 2023, Jonathan Wakely wrote:
That's why we need -fsane-operator-new
Although the standard forbids it, some of us just provide an inline
implementation
inline void* operator new(std::size_t n){return malloc(n);}
inline void operator delete(void*p)noexcept{free(p);}
inline void operator delete(void*p,std::size_t)noexcept{free(p);}
(I could certainly add a check to abort if malloc returns 0 or other
details, depending on what the application calls for)
It used to enable a number of optimizations, for instance in gcc-9
auto f(){ return std::vector<int>(4096); }
was optimized to just one call to calloc (someone broke that in gcc-10).
Using LTO on libsupc++ is related.
I don't know if we want to define "sane" operators new/delete, or just
have a flag that promises that we won't try to replace the default ones.
--
Marc Glisse
