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SN6PR1501MB2064.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Apr 2021 17:20:07.4689 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: zouab0b3nBG1+bZryOBMfmHYnrf4CySk+QGb0HtZbxApJYUTFuv8OTySkHQnk9M8 X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR15MB4708 X-OriginatorOrg: fb.com X-Proofpoint-ORIG-GUID: FoKRy9zuSTF-E31s9WmApPWg0LrI_idv X-Proofpoint-GUID: FoKRy9zuSTF-E31s9WmApPWg0LrI_idv X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-11_09:2021-04-09,2021-04-11 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 impostorscore=0 malwarescore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 mlxscore=0 mlxlogscore=999 phishscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104110136 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On 4/11/21 3:47 AM, Sedat Dilek wrote: > On Sat, Apr 10, 2021 at 6:49 PM Yonghong Song wrote: >> >> With clang compiler: >> make -j60 LLVM=1 LLVM_IAS=1 <=== compile kernel >> make -j60 -C tools/testing/selftests/bpf LLVM=1 LLVM_IAS=1 >> the test_cpp build failed due to the failure: >> warning: treating 'c-header' input as 'c++-header' when in C++ mode, this behavior is deprecated [-Wdeprecated] >> clang-13: warning: cannot specify -o when generating multiple output files >> >> test_cpp compilation flag looks like: >> clang++ -g -Og -rdynamic -Wall -I<...> ... \ >> -Dbpf_prog_load=bpf_prog_test_load -Dbpf_load_program=bpf_test_load_program \ >> test_cpp.cpp <...>/test_core_extern.skel.h <...>/libbpf.a <...>/test_stub.o \ >> -lcap -lelf -lz -lrt -lpthread -o <...>/test_cpp >> >> The clang++ compiler complains the header file in the command line. >> Let us remove the header file from the command line which is not intended >> any way, and this fixed the problem. >> >> Signed-off-by: Yonghong Song >> --- >> tools/testing/selftests/bpf/Makefile | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile >> index 6448c626498f..bbd61cc3889b 100644 >> --- a/tools/testing/selftests/bpf/Makefile >> +++ b/tools/testing/selftests/bpf/Makefile >> @@ -481,7 +481,7 @@ $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT) >> # Make sure we are able to include and link libbpf against c++. >> $(OUTPUT)/test_cpp: test_cpp.cpp $(OUTPUT)/test_core_extern.skel.h $(BPFOBJ) >> $(call msg,CXX,,$@) >> - $(Q)$(CXX) $(CFLAGS) $^ $(LDLIBS) -o $@ >> + $(Q)$(CXX) $(CFLAGS) test_cpp.cpp $(BPFOBJ) $(LDLIBS) -o $@ >> >> # Benchmark runner >> $(OUTPUT)/bench_%.o: benchs/bench_%.c bench.h >> -- >> 2.30.2 >> > > NOTE: bpf-next might be different from my build-environment. > > Yonghong, can you please re-test by adding explicitly CXX=g++ to your make line? > > Here I have: > > $ grep test_cpp make-log_tools-testing-selftests-bpf_clang_clang++.txt > 1907:clang++ -g -rdynamic -Wall -O2 -DHAVE_GENHDR > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/tools/include > -I/home/dileks/src/linux-kernel/git/include/generated > -I/home/dileks/src/linux-kernel/git/tools/lib > -I/home/dileks/src/linux-kernel/git/tools/include > -I/home/dileks/src/linux-kernel/git/tools/include/uapi > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf > -Wno-unused-command-line-argument -Wno-format-security > -Dbpf_prog_load=bpf_prog_test_load > -Dbpf_load_program=bpf_test_load_program test_cpp.cpp > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a > -lcap -lelf -lz -lrt -lpthread -o > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/test_cpp > > This clang++ line does not include <...>/test_core_extern.skel.h ^^^ > > $ grep test_core_extern.skel.h > make-log_tools-testing-selftests-bpf_clang_clang++.txt > 704:/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/tools/sbin/bpftool > gen skeleton /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/test_co > re_extern.o > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/test_core_extern.skel.h > 1592:/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/tools/sbin/bpftool > gen skeleton /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/no_alu > 32/test_core_extern.o > > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/no_alu32/test_core_extern.skel.h > > Checking test_cpp: > > $ /opt/llvm-toolchain/bin/llvm-objdump-12 -Dr test_cpp | grep extern > 0000000000417e50 : > 417e54: 75 22 jne 0x417e78 > 417e59: 75 10 jne 0x417e6b > 417e61: 75 21 jne 0x417e84 > 417e69: 75 1e jne 0x417e89 > 417e87: eb f2 jmp 0x417e7b > 417e8c: eb ed jmp 0x417e7b > > $ /opt/llvm-toolchain/bin/llvm-objdump-12 -Dr test_cpp | grep core_extern > [ EMPTY ] > > When compiled with g++ in an earlier setup this contained "core_extern". > > With this version of your patchser it breaks *here* when using CXX=g++ > (and uses /usr/bin/ld as linker): > > g++ -g -rdynamic -Wall -O2 -DHAVE_GENHDR > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/b > pf/tools/include -I/home/dileks/src/linux-kernel/git/include/generated > -I/home/dileks/src/linux-kernel/git/tools/lib > -I/home/dileks/src/linux-kernel/git/tools/include > -I/home/dileks/src/linux-kernel/git/tools/include/uapi > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf > -Wno-unused-command-line-argument -Wno-format-security > -Dbpf_prog_load=bpf_prog_test_load > -Dbpf_load_program=bpf_test_load_program test_cpp.cpp > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a > -lcap -lelf -lz -lrt -lpthread -o > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/test_cpp > > /usr/bin/ld: /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a(libbpf-in.o): > relocation R_X86_64_32 against `.rodata.str1.1' ca > n not be used when making a PIE object; recompile with -fPIE > collect2: error: ld returned 1 exit status > make: *** [Makefile:457: > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/test_cpp] > Error 1 I cannot reproduce the issue with g++ with bpf-next, my command line is g++ -g -Og -rdynamic -Wall -I/home/yhs/work/bpf-next/tools/testing/selftests/bpf -I/home/yhs/work/bpf-next/tools/testing/selftests/bpf/tools/include -I/home/yhs/work/bpf-next/include/generated -I/home/yhs/work/bpf-next/tools/lib -I/home/yhs/work/bpf-next/tools/include -I/home/yhs/work/bpf-next/tools/include/uapi -I/home/yhs/work/bpf-next/tools/testing/selftests/bpf -Wno-unused-command-line-argument -Wno-format-security -Dbpf_prog_load=bpf_prog_test_load -Dbpf_load_program=bpf_test_load_program test_cpp.cpp /home/yhs/work/bpf-next/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a -lcap -lelf -lz -lrt -lpthread -o /home/yhs/work/bpf-next/tools/testing/selftests/bpf/test_cpp I modified to g++ -g -rdynamic -Wall -O2 -DHAVE_GENHDR -I/home/yhs/work/bpf-next/tools/testing/selftests/bpf ... and cannot reproduce the issue. The macro HAVE_GENHDR is only effect for test_verifier. Could you try to run the above g++ command by adding test_core_extern.skel.h back, something like > g++ -g -rdynamic -Wall -O2 -DHAVE_GENHDR > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/b > pf/tools/include -I/home/dileks/src/linux-kernel/git/include/generated > -I/home/dileks/src/linux-kernel/git/tools/lib > -I/home/dileks/src/linux-kernel/git/tools/include > -I/home/dileks/src/linux-kernel/git/tools/include/uapi > -I/home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf > -Wno-unused-command-line-argument -Wno-format-security > -Dbpf_prog_load=bpf_prog_test_load > -Dbpf_load_program=bpf_test_load_program test_cpp.cpp > test_core_extern.skel.h > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a > -lcap -lelf -lz -lrt -lpthread -o > /home/dileks/src/linux-kernel/git/tools/testing/selftests/bpf/test_cpp The issue could be somewhere else? > > $ grep test_cpp ../make-log_tools-testing-selftests-bpf_clang_g++.txt > | grep test_core_extern.skel.h > [ EMPTY ] > > As said I do NOT use bpf-next. > > - Sedat - > > > > - Sedat - >