[Issue 23846] std.math can't compile under macos rosetta

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23846

--- Comment #7 from Caleb Xu <calebcenter at live.com> ---
Good catch, the example program was not checking errno. I've repeated the test
with a slightly modified example program:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

int main() {
    float float1 = strtof("0x0.8p-126f", NULL);
    printf("%s\n", (float1 != 0) ? "true" : "false");
    printf("%d\n", errno);

    float float2 = strtof("0x0.555556p-126f", NULL);
    printf("%s\n", (float2 != 0) ? "true" : "false");
    printf("%d\n", errno);

    double double1 = strtod("0x0.8p-1022", NULL);
    printf("%s\n", (double1 != 0) ? "true" : "false");
    printf("%d\n", errno);

    double double2 = strtod("0x0.5555555555555p-1022", NULL);
    printf("%s\n", (double2 != 0) ? "true" : "false");
    printf("%d\n", errno);
}

This time, the output with the newer Xcode toolchain is:

true
34
true
34
true
34
true
34

So looks like errno is indeed ERANGE here.

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