generic fenv wrapup
Mon Aug 12 13:51:00 GMT 2019
We discussed a lot for this patch. I see FE_NOMASK_ENV isn't included.
When looking at that, the comment in /usr/include/bits/fenv.h on CentOS 7
has a subject verb agreement issue that leads me to question its intent.
I would like someone to confirm that the glibc manual and this comment
mean the same thing:
/* Floating-point environment where none of the exception is masked. */
# define FE_NOMASK_ENV ((const fenv_t *) -2)
And from the manual:
If possible, the GNU C Library defines a macro FE_NOMASK_ENV which rep‐
resents an environment where every exception raised causes a trap
occur. You can test for this macro using #ifdef. It is defined
if _GNU_SOURCE is defined.
I think the manual version is clearer on intent.
Also.. there are three other GNU specific methods:
#define _GNU_SOURCE /* See feature_test_macros(7) */
int feenableexcept(int excepts);
int fedisableexcept(int excepts);
Should all those be added conditionally?
What else did we think needed to be done with the fenv generic code before
moving on to focusing on implementations?
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