When I try to use #pragma unroll, it throws error.
CC xdp_prog_user
CLANG xdp_prog_kern_02.o
LLC xdp_prog_kern_02.o
CLANG xdp_prog_kern_03.o
LLC xdp_prog_kern_03.o
CLANG tc_reply_kern_02.o
LLC tc_reply_kern_02.o
CLANG xdp_vlan01_kern.o
xdp_vlan01_kern.c:66:2: error: loop not unrolled: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering [-Werror,-Wpass-failed=transform-warning]
66 | for (i = 0; i < VLAN_MAX_DEPTH; i++) {
| ^
1 error generated.
make: *** [../common/common.mk:116: xdp_vlan01_kern.o] Error 1
I'm using the latest clang
pegasus@pegasus:~/Documents/xdp-tutorial/packet-solutions$ clang --version
clang version 19.0.0git (https://github.com/llvm/llvm-project.git 815644b4dd882ade2e5649d4f97c3dd6f7aea200)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/pegasus/Documents/llvm-project/build/bin