fish rust build fails with "could not exec the linker `x86_64-pc-cygwin-gcc`"

[Andrew Schulman]

On Wed, 22 Jul 2026 20:21:19 -0400, in gmane.os.cygwin.applications you wrote:

>>That's for 32bit only as on 64bit any newly compiled DLL should not overlap
>>with already rebased DLL (and empirically doesn't unless BLODA steps in,
>>to which these days unfortunaltely Windows Defender needs to be counted).
>
>I'm afraid you're right about Windows Defender.
>
>I have two client hosts, running Windows 10 and 11 respectively. The build
>fails in the same random way on both of them. The only BLODA-ish app on both
>of them is Windows Defender.
>
>But when I push the build up to scallywag, it succeeds every time. Which is
>good news.

And that is confirmed. When I exclude the build directory and Cygwin
installation root from Windows Defender scans as you suggested, the build now
succeeds every time. Thanks for your help. 

Andrew