[cfe-dev] Question about compiling exit and clang assert

[Peter Lawrence via cfe-dev]

I have a simulator for a target machine that I wrote an llvm port for
The simulator detects a return to address zero as returning from “main"
and that ends the simulation, with main's return value then being printed out
(and finally returned from the simulator to the shell).

I tried to implement “exit” in C rather than in assembly with the following


void * __builtin_frame_address (unsigned int level);

int exit (int X)
{
	((int*)__builtin_frame_address(0))[1] = 0; // simulator termination magic
	return X; // put result code in R0, as though returning X from main
}


After some warnings about redeclaration and about noreturn
clang crashes with an assert,

So my question is, isn’t the clang assertion too conservative ?
Why crash after warnings, why not let it go through ?


TIA,
Peter Lawrence.


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