https://llvm.org/bugs/show_bug.cgi?id=25510
Bug ID: 25510
Summary: __builtin_cpu_supports("sse3") compiles, but fails
when linking.
Product: lld
Version: unspecified
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: p...@shifteleven.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
I am compiling on OSX 10.11 with clang-3.7 from macports. Here's some sample
code to demonstrate the problem:
#include <stdio.h>
#include <stdlib.h>
int main() {
#if(__has_builtin(__builtin_cpu_supports)) && defined(__x86_64__)
printf("__builtin_cpu_supports: %d\n", __builtin_cpu_supports("sse3"));
#else
printf("__builtin_cpu_cupports not available\n");
#endif
return EXIT_SUCCESS;
}
If I compile with clang-3.7 or clang-3.8 (both which claim to have the builtin
cpu supports), everything works. However, during linking, I get the following:
Undefined symbols for architecture x86_64:
"___cpu_model", referenced from:
_dt_init in darktable.c.o
ld: symbol(s) not found for architecture x86_64
With earlier versions of clang, I see the else clause.
I have also seen this in the wild where this problem exists for FreeBSD as
well.
https://github.com/darktable-org/darktable/commit/081bc5823870918160fdd93d0157d56263add7d5.
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