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Use C99 macros NAN, INFINITY, isnan, isinf. If they're not available:
- Assume that (0.0 / 0.0) generates a NaN and !(x == x) tests for NaN.
- Use C89's HUGE_VAL for INFINITY.
Remove manual handling of NaN, infinity and negative zero in functions
xmlXPathValueFlipSign and xmlXPathDivValues.
Remove xmlXPathGetSign. All the tests for negative zero can be replaced
with a test for negative or positive zero.
Simplify xmlXPathRoundFunction.
Remove Trio dependency.
This should work on IEEE 754 compliant implementations even if the C99
macros aren't available, but will likely break some ancient platforms.
If problems arise, my plan is to port the relevant trionan.c solution
to xpath.c. Note that non-compliant implementations are impossible
to fully support, anyway, since XPath requires IEEE 754.
For now this is mainly useful if you work on a fork of the libxml2
mirror on GitHub:
https://github.com/GNOME/libxml2
Start with two build setups:
- GCC with as many GNU extensions disabled as possible, trying to
emulate a C89 compiler on a POSIX system.
- clang with ASan and UBSan.
The Python tests don't set an exit code, so Travis won't detect
failures. The same goes for "make tests", but we only run "make check"
anyway.
