The website docs do not mention eclipse / cdt etc.
adding installation instructions / configuration info would greatly improve the chances of eclipse users using the MinGW compiler within CDT
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Since we don't maintain eclipse/CDT, why do you think we, as a project should assume responsibility for documenting how to configure eclipse/CDT for use with MinGW? I have no idea how many project contributors even use eclipse/CDT; I suspect it is a small minority.
If any eclipse/CDT *user* wishes to document such usage, they are free to do so, on MinGWiki; indeed, had you bothered to look, you could have found http://wiki.fredlackey.com/pmwiki.php?n=HelpfulInfo.DevelopmentEclipseCppCofnig , via a link on http://mingw.org/MinGWiki/index.php/MinGWHowTo . (Some of the version info on that page is rather outdated. However, it is externally maintained, so requests to update it need to go to it's maintainer).