[Bug bootstrap/77593] [7 Regression] Bootstrap failure with configure-target-libgfortran " cygwin64 Windows 10 anniversary

[tprince at computer dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77593

--- Comment #2 from tprince at computer dot org ---
I suspect the Windows 10 provided svn may be partly at fault (although it works
for bootstrapping on the Microsoft provided gcc in linux subsystem).  I grabbed
trunk using cygwin svn and have seen the bootstrap go as far as the stage3
libstdc++ build (without intervention) before jumping back to stage1 and
failing on permissions to move into stage1-gcc.