[...]

            py.test.skip("%s not found" % lib_m)
        ffi = FFI(backend=self.Backend())
        ffi.cdef("""
                double cos(double x);
            """)
        m = ffi.dlopen(path)
        x = m.cos(1.23)
>       assert x == math.cos(1.23)
E       assert nan == 0.3342377271245026
E        +  where 0.3342377271245026 = <built-in function cos>(1.23)
E        +    where <built-in function cos> = math.cos
testing/cffi0/test_function.py:68: AssertionError
______________________ TestFunction.test_dlopen_filename _______________________
self = <testing.cffi0.test_function.TestFunction object at 0xf558ebec>
    def test_dlopen_filename(self):
        path = ctypes.util.find_library(lib_m)
        if not path:
            py.test.skip("%s not found" % lib_m)
        ffi = FFI(backend=self.Backend())
        ffi.cdef("""
                double cos(double x);
            """)
        m = ffi.dlopen(path)
        x = m.cos(1.23)
>       assert x == math.cos(1.23)
E       assert nan == 0.3342377271245026
E        +  where 0.3342377271245026 = <built-in function cos>(1.23)
E        +    where <built-in function cos> = math.cos
testing/cffi0/test_function.py:68: AssertionError
======== 2 failed, 1870 passed, 93 skipped, 4 xfailed in 174.51 seconds ========
error: Bad exit status from /tmp/B.bYOKk6/BUILD/tmp/rpm-tmp.99791 (%build)
RPM build errors:
    Bad exit status from /tmp/B.bYOKk6/BUILD/tmp/rpm-tmp.99791 (%build)
ended at: Fri Aug 24 17:31:35 2018, done in 0:02:57.912052
error: No files produced.
mesg: ttyname failed: Inappropriate ioctl for device
+ chmod -R u+rwX /tmp/B.bYOKk6/BUILD
+ rm -rf /tmp/B.bYOKk6/tmp /tmp/B.bYOKk6/BUILD
mesg: ttyname failed: Inappropriate ioctl for device
+ rm -rf /tmp/B.bYOKk6
Begin-TLD-Builder-Info
Build-Time: user:144.28s sys:48.04s real:179.53s (faults io:7 non-io:8416577)
End-TLD-Builder-Info