https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68081
Bug ID: 68081
Summary: Cygwin GCC cannot compile program that uses
__builtin_ia32_rdseed64_step
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: noloader at gmail dot com
Target Milestone: ---
I'm testing on Cygwin64. Cygwin64 provides the 5.2.0 compiler.
Attempting to compile the following results in an error:
$ cat rdseed.c
#include <stdint.h>
int main()
{
uint64_t val;
__builtin_ia32_rdseed64_step(&val);
return (int)val;
}
The error is:
$ gcc -mrdseed rdseed.c -o rdseed.exe
...
rdseed.c:6:36: error: '__builtin_ia32_rdseed64_step' was not declared in this
scope.
The expected define appears to be defined:
$ cpp -mrdseed -dM </dev/null | grep -i seed
#define __RDSEED__ 1
The RDRAND equivalent compiles and executes.
-----
My apologies if this should be reported to Cygwin. I cannot find their bug
reporter. In fact, I can't even find a mailing list to discuss it. Their
mailing list page tells me where *not* to discuss or report bugs, but does not
state where to discuss or report them.
