bext/jpeg: windows unresolved external symbols

[kennethsdavis]

BRL-CAD main @ 2275f60
CMake 3.31.2, generator=Visual Studio 16 2019

There are a lot of unresolved symbols that should be in the CRT.

Build log attached.
JPEG_BLD-build-out.log

[starseeker]

Hmm. The references I'm seeing to similar issues online seem to suggest a possibility of toolchain configuration issues... If you try to build the jpeg library in isolation, not as part of bext, does it succeed?

[kennethsdavis]

Curiously the jpeg build succeeds when I build bext in isolation, not as part of brl-cad. Is there any additional build info I could provide that would be helpful? Regardless, I'll keep troubleshooting.

[starseeker]

Is there any behavioral difference between a Debug build and Release build? The next deeper step beyond that would be to inspect the build flags and toolchains being used in the isolated bext vs the configure-driven bext and try to see where (beyond paths, obviously) the differences lie.