Can't compile with DEBUG flag set on 535.86.05 (error: unknown type name ‘class’)

NVIDIA Open GPU Kernel Modules Version

535.86.05

Operating System and Version

Ubuntu 22.04

Kernel Release

5.19.0-32-generic

Build Command

make modules DEBUG=1

Terminal output/Build Log

lachlan@lachlan-ubuntu-server:~/Downloads/open-gpu-kernel-modules-535.86.05$ make modules DEBUG=1
make -C src/nvidia
make[1]: Entering directory '/home/lachlan/Downloads/open-gpu-kernel-modules-535.86.05/src/nvidia'
 [ nvidia            ]  CC           generated/g_access_cntr_buffer_nvoc.c
 [ nvidia            ]  CC           generated/g_all_dcl_pb.c
 [ nvidia            ]  CC           generated/g_binary_api_nvoc.c
 [ nvidia            ]  CC           generated/g_bindata.c
 [ nvidia            ]  CC           generated/g_ccsl_nvoc.c
 [ nvidia            ]  CC           generated/g_ce_utils_nvoc.c
In file included from generated/g_ce_utils_nvoc.c:8:
generated/g_ce_utils_nvoc.h:169:25: error: unknown type name ‘class’
  169 | NVOC_PREFIX(ceutilsapi) class CeUtilsApi : GpuResource
      |                         ^~~~~
generated/g_ce_utils_nvoc.h:169:42: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘:’ token
  169 | NVOC_PREFIX(ceutilsapi) class CeUtilsApi : GpuResource
      |                                          ^
make[1]: *** [Makefile:196: _out/Linux_x86_64/g_ce_utils_nvoc.o] Error 1
make[1]: Leaving directory '/home/lachlan/Downloads/open-gpu-kernel-modules-535.86.05/src/nvidia'
make: *** [Makefile:34: src/nvidia/_out/Linux_x86_64/nv-kernel.o] Error 2

More Info

No response

Reproduce the failure with make modules DEBUG=1 from the repository root, then inspect src/nvidia/generated/g_ce_utils_nvoc.h at line 169 and the surrounding build rules in src/nvidia/Makefile. Trace why this generated header is compiled as C and confirm the fix by rerunning the same build successfully.