gcc hangs even on simple compile tasks

Running cygwin-64 on a 64-bit Win 10 platform and up until recently I have
had NO problems at all.

Starting the end of last week, gcc has started behaving badly. Whether I invoke
it from a makefile or directly from bash, almost ALL of the timer, it hangs
forever, and Task Manager shows cc1 as "running", but consuming no CPU as
far as I can tell. If I kill it through task manager, the prompt returns
in bash (or make dies with an "interrupted" error.

I can do the following:

    gcc -v

and it returns a bunch of stuff, most importantly

   Using built-in specs.
   COLLECT_GCC=gcc
    COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-cygwin/13/lto-wrapper.exe
    Target: x86_64-pc-cygwin
    Configured with: /mnt/share/packages/gccmake/gcc-13/gcc/gcc.x86_64/src/

...  <details deleted>

    Thread model: posix
    Supported LTO compression algorithms: zlib zstd
    gcc version 13.4.0 (GCC)

so that much is working.

I have gone so far as as shutting down cygwin, renaming /cygwin-64 to
/cygin64.sav and reinstalling cygwin from scratch with no change. I
also tried uninstalling the gcc-core package and reinstalling it
again with no improvement.

The simple "hello.c" program run from bash directly:

    gcc -o hello.exe hello.c

hangs forever.

Meanwhile, the same sources compile fine on a WinXP machine running
an older version of cygwin and gcc (version 5.4.0) run just fine.

I'm at a total loss as to where to go next. ANy more information that
anyone might need, I'd be happy to send along.

But I'm stumped.


-- 
+-----------------------------------+
|            Dick Pierce            |
|         Diverse Pursuits          |
| Technical Engineering/Development |
|           cartchunk.org           |
|       Boston - Spruce Head        |
+-----------------------------------+



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