Windows Defender false positives from fltk-1.4 with mingw32/gcc-9.2 on WIn11

[imacarthur]

So I was rebuilding my checkouts, and on my Win11 test box, when I compile with mingw-32 using their gcc-9.2, and static link in the '-static-libgcc -static-libstdc++' then Windows Defender panics and deletes about half of the exe's in the test and examples folders.

If I use another compiler (mingw32 / gcc-6.3 or mingw64, say) this does not happen, and if I don't link in '-static-libgcc -static-libstdc++'  then again, no trigger.

Looks like some combination of things with the static link is triggering whatever signature match Defender is looking for.

Hmm, OK, just tried 1.5, and it also seems to trigger if I static link '-static-libgcc -static-libstdc++' 

Just FYI.

Is anyone else seeing this? I assume I'm not the only person with mingw32/gcc-9 running!

[Albrecht Schlosser]

On 3/17/25 10:40 imacarthur wrote:

So I was rebuilding my checkouts, and on my Win11 test box, when I compile with mingw-32 using their gcc-9.2, and static link in the '-static-libgcc -static-libstdc++' then Windows Defender panics and deletes about half of the exe's in the test and examples folders.

...

Is anyone else seeing this? I assume I'm not the only person with mingw32/gcc-9 running!

I don't see this in my Windows 10 VM with

$ gcc --version
gcc.exe (MinGW.org GCC Build-2) 9.2.0

[imacarthur]

On Monday, 17 March 2025 at 18:15:04 UTC Albrecht-S wrote:

On 3/17/25 10:40 imacarthur wrote:

So I was rebuilding my checkouts, and on my Win11 test box, when I compile with mingw-32 using their gcc-9.2, and static link in the '-static-libgcc -static-libstdc++' then Windows Defender panics and deletes about half of the exe's in the test and examples folders.

Is anyone else seeing this? I assume I'm not the only person with mingw32/gcc-9 running!

I don't see this in my Windows 10 VM with
$ gcc --version gcc.exe (MinGW.org GCC Build-2) 9.2.0

Hmm, interesting. Thanks Albrecht.

I might need to get a second virus-scanner's opinion on that box then, Just In Case...