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From:	=?UTF-8?q?Llu=C3=ADs_Batlle_i_Rossell?= <viric AT viric DOT name>
To:	cygwin AT cygwin DOT com
Subject:	Boost wrongly built for 'context' lib
Date:	Wed, 16 Dec 2020 14:12:23 +0100
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Hello,

the boost library (1.66, quite outdated) is wrongly built for cygwin
regarding the 'context' lib, in a way that makes the 'coroutine2' lib
crash.

b2 should be called with "context-impl=ucontext" argument when building
it.

And programs using boost context/coroutine2 should build with the flag
-DBOOST_USE_UCONTEXT

These options are documented at the bottom of this page:
https://www.boost.org/doc/libs/1_75_0/libs/context/doc/html/context/architectures.html

And that would fix the problem here reported for the nix program.
https://github.com/NixOS/nix/issues/4360

Can someone make that fix?

I haven't tried explicitly 1.66 with that build flag, but 1.75 failed the
same way until I added that build flag.

Thank you,
Lluís.

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