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hypot error : '__builtin_choose_expr' requires a constant expression
- From: "Chunxia Du" <duchunxia at 163 dot com>
- To: newlib <newlib at sourceware dot org>
- Date: Fri, 29 Jun 2018 10:30:56 +0800 (CST)
- Subject: hypot error : '__builtin_choose_expr' requires a constant expression
Hi All,I got errors when I tried to use the function hypot. It said " '__builtin_choose_expr' requires a constant expression". I found the error occurs at "__tg_integer" in tgmath.h. It does not treat "(__typeof__(__e1))1.5 == 1" as a constantexpression. I am confused that why it's not a constant expression, and how should I fix this.
The code is as follows:
#include <tgmath.h>
int main()
{
double __complex__ z = 0.0;
hypot(__real__ z, __imag__ z);
return 0;
}
Looking forward to your reply!
Thanks and Regards,
Chunxia Du