http://llvm.org/bugs/show_bug.cgi?id=19236
Bug ID: 19236
Summary: -march=native doesn't work in virtualized environment
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
I have x86-64 Debian sid installed in kvm-qemu. I have 64-bit clang-3.5
installed from Debian repository.
When compiling a simple program with -march=native, clang fails.
$ cat hello.c
#include <stdio.h>
int main(void)
{
printf("Hello World!\n");
return 0;
}
$ clang -march=native hello.c
error: unknown target CPU 'athlon'
Apparently, there is some bug in processor detection, even if the system is
64-bit, clang detects a 32-bit "athlon" processor and subsequently fails,
because
the 64-bit target doesn't know this processor.
Note that kvm reports some features of the underlying CPU (the CPU is
istanbul-class Opteron) as not present in order to allow the program to be
migrated. This probably confuses clang, so that it clasifies the CPU as 32-bit
Athlon.
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