| Issue |
92698
|
| Summary |
[clang][WebAssembly] Odd builtin behaviour
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Photosounder
|
Using clang (version 18.1.4) to compile WebAssembly and going the `-nostdlib` route I'm noticing strange things when I try to use some builtins to implement libc functions. For instance doing `static float asinf(float x) { return __builtin_asinf(x); }` or `static double sqrt(double x) { return __builtin_sqrt(x); }` works fine but doing `static double exp2(double x) { return __builtin_exp2(x); }` gives me `wasm-ld: error: C:/msys/tmp/rl-89dcca.o: undefined symbol: exp2` and making it non-static with an `extern` prototype above itself just makes it call itself in a loop. That's even though `__has_builtin(__builtin_exp2)` is positive.
It seems as though some builtins aren't really there for WebAssembly, but there doesn't seem to be a clear way to determine which are actually usable, and knowing which I can actually use is what I would need.
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