Documentation | Documentation on Cygwin toolchain builds is misleading (#108)

Tue May 6 14:51:28 UTC 2025

Kinsey Moore created an issue: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/issues/108

## Summary
Historically, Cygwin builds produced windows-native binaries. This changed around 2015 and the example in the documentation was not updated and instead suggests that a standard toolchain build will still produce a windows-native compiler. In actuality, a standard toolchain build will produce Cygwin binaries that depend on Cygwin DLLs which are not present in the standard windows environment.

I do not yet have the proper configuration flags to produce a working native toolchain from Cygwin, but `--host=x86_64-w64-mingw32` appears to be working that direction before failing to build MPFR with a missing gmp.h even though it's built in the previous step.

## Steps to reproduce

### Pre-set options

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/issues/108
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