Em Thu, Jun 14, 2018 at 10:21:30AM -0700, Alexei Starovoitov escreveu:
> On 6/14/18 10:18 AM, Arnaldo Carvalho de Melo wrote:
> > Just out of curiosity, is there any plan to have this as a clang option?
> I think
> clang ... -mllvm -mattr=dwarfris
> should work.
[root@jouet bpf]# cat ~/.perfconfig
[llvm]
dump-obj = true
clang-opt = -g -mllvm -mattr=dwarfris
[root@jouet bpf]# trace -e openat,hello.c touch /tmp/kafai
clang (LLVM option parsing): Unknown command line argument '-mattr=dwarfris'.
Try: 'clang (LLVM option parsing) -help'
clang (LLVM option parsing): Did you mean '-mxgot=dwarfris'?
ERROR: unable to compile hello.c
Hint: Check error message shown above.
Hint: You can also pre-compile it into .o using:
clang -target bpf -O2 -c hello.c
with proper -I and -D options.
event syntax error: 'hello.c'
\___ Failed to load hello.c from source: Error when
compiling BPF scriptlet
(add -v to see detail)
<SNIP>
[root@jouet bpf]#
[root@jouet bpf]# trace -e openat,hello.c touch /tmp/kafai |& grep clang
clang (LLVM option parsing): Unknown command line argument '-mattr=dwarfris'.
Try: 'clang (LLVM option parsing) -help'
clang (LLVM option parsing): Did you mean '-mxgot=dwarfris'?
clang -target bpf -O2 -c hello.c
[root@jouet bpf]# trace -v -e openat,hello.c touch /tmp/kafai |& grep clang
set env: CLANG_EXEC=/usr/local/bin/clang
llvm compiling command : /usr/local/bin/clang -D__KERNEL__ -D__NR_CPUS__=4
-DLINUX_VERSION_CODE=0x41100 -g -mllvm -mattr=dwarfris -nostdinc -isystem
/usr/lib/gcc/x86_64-redhat-linux/7/include
-I/home/acme/git/linux/arch/x86/include -I./arch/x86/include/generated
-I/home/acme/git/linux/include -I./include
-I/home/acme/git/linux/arch/x86/include/uapi
-I./arch/x86/include/generated/uapi -I/home/acme/git/linux/include/uapi
-I./include/generated/uapi -include
/home/acme/git/linux/include/linux/kconfig.h -I/home/acme/lib/include/perf/bpf
-Wno-unused-value -Wno-pointer-sign -working-directory
/lib/modules/4.17.0-rc5/build -c /home/acme/bpf/hello.c -target bpf -O2 -o -
clang (LLVM option parsing): Unknown command line argument '-mattr=dwarfris'.
Try: 'clang (LLVM option parsing) -help'
clang (LLVM option parsing): Did you mean '-mxgot=dwarfris'?
clang -target bpf -O2 -c hello.c
[root@jouet bpf]#
The message "(LLVM option parsing)" implies what you suggest, but didn't
worked :-\
-mllvm <value> Additional arguments to forward to LLVM's option
processing
Almost there tho :-\
- Arnaldo
