Model bugs with latest GCC 14 and Clang 19

[illwieckz]

I remember @DolceTriade said one day he seen bugs while compiling with GCC 14.

I confirm I see bugs affecting models in a weird way when compiling with GCC 14 (no issue with GCC 13):

First stable version of Clang 19 was released today and then out of curiosity I test it, and I got another bug but affecting the models too, but in a different way (no issue with Clang 18):

Maybe we actually do something wrong if two compilers fail on it.

[illwieckz]

An easy way to test both GCC 14 and Clang 19 is to use Ubuntu Noble (it has GCC 14 in repositories) and to install Clang 19 from the LLVM upstream repository for Ubuntu: https://apt.llvm.org

[slipher]

As usual this doesn't happen with GCC 14.2 on Windows.

Does it matter what vm.cgame.type you use? Does it matter if you disable r_vboModels?

[illwieckz]

I get the same results with both DLL and EXE cgame.

I get the same results with r_vboVertexSkinning 0 and r_vboModel 0 (actually r_vboVertexSkinning 0 has to be preferred over r_vboModel 0).

[illwieckz]

Interesting, with NEXE cgame, I reproduce the Clang 19 bug, but not the GCC 14 bug.

[DolceTriade]

Removing -ffast-math fixes issue on GCC14 for me.