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Add a section on slow linking under MinGW to "Known Limitations" docs 

Unless someone steps up to fix the long link times with a set of
unobtrusive changes, the recommended solution will remain "use a better
linker".

Related to #1205, #1247, and #1637

Closes #1247
Closes #1637
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Martin Hořeňovský 2019-10-20 19:43:19 +02:00
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@ -45,6 +45,15 @@ the `REQUIRE` family of macros), Catch2 does not know that there are no
more sections in that test case and must run the test case again.
### MinGW/CygWin compilation (linking) is extremely slow
Compiling Catch2 with MinGW can be exceedingly slow, especially during
the linking step. As far as we can tell, this is caused by deficiencies
in its default linker. If you can tell MinGW to instead use lld, via
`-fuse-ld=ldd`, the link time should drop down to reasonable length
again.
## Features
This section outlines some missing features, what is their status and their possible workarounds.