Re: tools/nolibc: fix missing strlen() definition and infinite loop with gcc-12

Willy Tarreau wrote:

+#if defined(__GNUC__) && (__GNUC__ >= 12) +__attribute__((optimize("no-tree-loop-distribute-patterns"))) +#endif static __attribute__((unused)) -size_t nolibc_strlen(const char *str

I'd suggest to use asm("") in the loop body. It worked in the past to prevent folding division loop back into division instruction.

Or switch to

size_t f(const char *s) { const char *s0 = s; while (*s++) ; return s - s0 - 1; }

which compiles to 1 branch, not 2.

But of course they could recognise this pattern too.