Hi,

I've noticed some interesting errors on some platforms. It would be interesting to try to know what's the cause and fix or prepare workaround if possible.

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1. Most of the tests of Sandia-intel-11.1 runner. Surprisingly, not all. E.g.:

http://www.boost.org/development/tests/develop/developer/output/Sandia-intel-11-1-boost-bin-v2-libs-geometry-test-geometries-box-test-intel-darwin-debug.html

Run fail: signal: SIGSEGV, si_code: 0 (memory access violation at address: 0x00000000)

2. convex_hull (also multi) on darwin-clang-11 with address sanitizer:

http://www.boost.org/development/tests/develop/developer/output/marshall-mac-boost-bin-v2-libs-geometry-test-algorithms-convex_hull-test-clang-darwin-asan11-debug.html

Run fail: AddressSanitizer: container-overflow on address 0x60300000d018 at pc 0x1036ca7ba bp 0x7fff5dd28d30 sp 0x7fff5dd284f0

3. Some tests of Sandia-cray runner (distance, intersection, etc.):

http://www.boost.org/development/tests/develop/developer/output/Sandia-Cray-boost-bin-v2-libs-geometry-test-algorithms-distance-test-cray-5-24-release.html

Run fail: difference{1.79769e+308} between d5{1.5700924586837752e-16} and return_type(0){0} exceeds 0.001%

4. QNX
Run fail: check bg::distance(boost_polygon_point, boost_geometry_point) == 2 * std::sqrt(2.0) has failed [2.82842712474619 != 2.8284271247461904]

intersection

Run fail: difference{1.12866e-06} between detected_length_or_area{3461.025390625} and expected_length_or_area{3461.0214843000002} exceeds 0.0001%

Those should be simple to fix

5. QNX select_most_precise

http://www.boost.org/development/tests/develop/developer/output/NA-QNX650-SP1-ARM-experimental-boost-bin-v2-libs-geometry-test-util-select_most_precise-test-qcc-4-4-2_arm-debug-debug-symbols-off-link-static.html

Run fail: check (boost::is_same<type, ExpectedType>::type::value) has failed

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I'll try to track them down but if you are able to debug some of the tests, e.g. have a Mac with clang and are willing to check what's wrong with the convex_hull test, we'll appreciate it.

Regards,
Adam