On Tue, 2025-09-09 at 23:45 +0200, Arsen Arsenović via Gcc-help wrote: > Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> writes: > > > Yup. Some *very* old programs used alloca where "malloc" would he more > > modern style. The two do similar things, but they aren't completely > > interchangeable. alloca() is a nicer interface for some programming > > styles. > > > > alloca() isn't C standard, and it isn't even POSIX, but most systems > > do have it. C variable length arrays *are* standard C (of course), and > > they are often implemented using alloca(). > > Ah, indeed, you're right. I was under the impression it is in the > standard proper. > > My bad. > > We claim to be able to build using an ISO C++14 compiler, though (and > presumably a C compiler of similar age), so perhaps we shouldn't use > alloca. The claim is not fully true anyway... for example we perform narrowing conversions from constant, but C++14 does not allow to do so. So for a new target it seems easier to bootstrap GCC via canadian cross. -- Xi Ruoyao <xry111@xxxxxxxxxxx>
