Hi Arnaldo,
When building a kernel with LLVM and CONFIG_DEBUG_INFO_BTF after commit
32ef9e5054ec ("Makefile.debug: re-enable debug info for .S files") in
the kernel, I see the following spew of warnings, which appear to come
from pahole:
$ clang --version
clang version 15.0.0 (Fedora 15.0.0-3.fc38)
Target: x86_64-redhat-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ pahole --version
v1.24
$ make -skj"$(nproc)" ARCH=x86_64 LLVM=1 defconfig
$ scripts/config \
-d DEBUG_INFO_NONE \
-e BPF_SYSCALL \
-e DEBUG_INFO_BTF \
-e DEBUG_INFO_DWARF5
$ make -skj"$(nproc)" ARCH=x86_64 LLVM=1 olddefconfig all
...
die__process_unit: DW_TAG_label (0xa) @ <0x7b> not handled!
die__process_unit: tag not supported 0xa (label)!
die__process_unit: DW_TAG_label (0xa) @ <0x97> not handled!
die__process_unit: DW_TAG_label (0xa) @ <0xbd> not handled!
die__process_unit: DW_TAG_label (0xa) @ <0xed> not handled!
die__process_unit: DW_TAG_label (0xa) @ <0x109> not handled!
die__process_unit: DW_TAG_label (0xa) @ <0x12a> not handled!
die__process_unit: DW_TAG_label (0xa) @ <0x146> not handled!
die__process_unit: DW_TAG_label (0xa) @ <0x16f> not handled!
...
Is this a problem with LLVM or pahole? I do not see this when building
with GCC + GNU as but that could just be a red herring. I assume that
there could be something missing for processing debug info from
assembly, perhaps? If there is any further information I can provide or
anything I can test, I am more than happy to do so.
Cheers,
Nathan
