Handle issue 1255 and update docs

[ckormanyos]

No description provided.

[ckormanyos]

See also #1255

[ckormanyos]

Something weird is happening in CI, in this PR and also in the CI that ran when @mborland simply incremented the library version here.

It seems like something is influencing files that were not touched in the changes.

Cc: @jzmaddock

[ckormanyos]

For some reason, when exceptions are off at compilation time, we are hitting this line. Then certain tests in the Math test suite fail when Boost has no exceptions yet this file is still included.

That line is, however, two years old. I wonder what tiny change and where causes this phenomenon today?

[ckormanyos]

Hmmm I don't know so much about the dependencies in the Jamfile. But why is Math's test suite trying to build the libboost_exception.a archive here?

This is in the recent version increment from @mborland

[jzmaddock]

There is some cruft in the Jamfile, but there are other issues too. I'm working through them in #1254, it's getting closer to green, but there are no cigars being lit just yet!

[ckormanyos]

some cruft in the Jamfile, but there are other issues too. I'm working through them in #1254, it's getting closer to green,

Thanks John. OK cool. I'll hold my horses a bit and wait till that goes green and gets in develop.

In the meantime, I'll try to ensure that the new tests for #1255 are all passing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.83%. Comparing base (e818106) to head (76dede0).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1256   +/-   ##
========================================
  Coverage    93.83%   93.83%           
========================================
  Files          657      658    +1     
  Lines        55244    55256   +12     
========================================
+ Hits         51840    51852   +12     
  Misses        3404     3404           

Files with missing lines	Coverage Δ
.../boost/math/special_functions/detail/bessel_yn.hpp	100.00% <100.00%> (ø)
test/git_issue_1255.cpp	100.00% <100.00%> (ø)

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[ckormanyos]

It it is good enough for #1254, it's good enough for #1255, with the repeated comment, OK looks good to go, only failures are from cycl Cauchy tests.

We'll let @mborland look at those.