get wrong result when compile c to wasm with -ffreestanding flag

[elvin-du]

compile pow function that musl standard c library to wasm using clang, when with -ffreestanding flag, will get wrong result. for example:

#include <math.h>
void printdf(double a):
void test(){
         printdf(pow((double)2.0, (double)0.3));
}

use following command to compile:

clang  --target=wasm32 -ffreestanding ............... -o test.wasm

the function print 1，not 1.2311444133449163.

I test using all following version of clang, the results are the same, all are 1.

version:

v4.0, v7.0, v9.0

but, if I do not with -ffreestanding flag， all the result are 1.2311444133449163.

test environment:

OS:

apple, and centos

arch:

x86-64

[elvin-du]

sorry, I got the answer. It's not the problem of clang, but it's the bug of VM that i used.