linux-kernel - Re: [PATCH v1 02/13] perf build: Make BUILD_BPF_SKEL default, rename to NO_BPF

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Message-ID: <ZA+FOpzJswZx8os+@kernel.org>
Date:   Mon, 13 Mar 2023 17:19:06 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Quentin Monnet <quentin@...valent.com>,
        Andres Freund <andres@...razel.de>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Pavithra Gurushankar <gpavithrasha@...il.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>,
        Martin Liška <mliska@...e.cz>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        llvm@...ts.linux.dev, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v1 02/13] perf build: Make BUILD_BPF_SKEL default, rename
 to NO_BPF_SKEL

Em Fri, Mar 10, 2023 at 10:57:42PM -0800, Ian Rogers escreveu:
> BPF skeleton support is now key to a number of perf features. Rather
> than making it so that BPF support must be enabled for the build, make
> this the default and error if the build lacks a clang and libbpf that
> are sufficient. To avoid the error and build without BPF skeletons the
> NO_BPF_SKEL=1 flag can be used. Add a build-options flag to 'perf
> version' to enable detection of the BPF skeleton support and use this
> in the offcpu shell test.

Checking this:

cd . && make LIBBPF_DYNAMIC=1 FEATURES_DUMP=/var/home/acme/git/perf-tools-next/tools/perf/BUILD_TEST_FEATURE_DUMP -j32 O=/tmp/tmp.Rr5xDuXo13 DESTDIR=/tmp/tmp.cYdDvy09eY
  BUILD:   Doing 'make -j32' parallel build
  HOSTCC  /tmp/tmp.Rr5xDuXo13/fixdep.o
  HOSTLD  /tmp/tmp.Rr5xDuXo13/fixdep-in.o
  LINK    /tmp/tmp.Rr5xDuXo13/fixdep
Warning: Kernel ABI header at 'tools/include/uapi/linux/in.h' differs from latest version at 'include/uapi/linux/in.h'
diff -u tools/include/uapi/linux/in.h include/uapi/linux/in.h
Warning: Kernel ABI header at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h'
diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h
Warning: Kernel ABI header at 'tools/arch/arm64/include/uapi/asm/perf_regs.h' differs from latest version at 'arch/arm64/include/uapi/asm/perf_regs.h'
diff -u tools/arch/arm64/include/uapi/asm/perf_regs.h arch/arm64/include/uapi/asm/perf_regs.h
Warning: Kernel ABI header at 'tools/include/linux/coresight-pmu.h' differs from latest version at 'include/linux/coresight-pmu.h'
diff -u tools/include/linux/coresight-pmu.h include/linux/coresight-pmu.h
Makefile.config:1130: No openjdk development package found, please install JDK package, e.g. openjdk-8-jdk, java-1.8.0-openjdk-devel

  GEN     /tmp/tmp.Rr5xDuXo13/common-cmds.h
  CC      /tmp/tmp.Rr5xDuXo13/dlfilters/dlfilter-test-api-v0.o
  CC      /tmp/tmp.Rr5xDuXo13/dlfilters/dlfilter-show-cycles.o
  LINK    /tmp/tmp.Rr5xDuXo13/dlfilters/dlfilter-test-api-v0.so
  LINK    /tmp/tmp.Rr5xDuXo13/dlfilters/dlfilter-show-cycles.so
  INSTALL /tmp/tmp.Rr5xDuXo13/libsubcmd/include/subcmd/exec-cmd.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libsubcmd/include/subcmd/help.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libsubcmd/include/subcmd/pager.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libsubcmd/include/subcmd/parse-options.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libsubcmd/include/subcmd/run-command.h
  CC      /tmp/tmp.Rr5xDuXo13/libsubcmd/exec-cmd.o
  CC      /tmp/tmp.Rr5xDuXo13/libsubcmd/help.o
  CC      /tmp/tmp.Rr5xDuXo13/libsubcmd/pager.o
  CC      /tmp/tmp.Rr5xDuXo13/libsubcmd/parse-options.o
  CC      /tmp/tmp.Rr5xDuXo13/libsubcmd/run-command.o
  CC      /tmp/tmp.Rr5xDuXo13/libsubcmd/sigchain.o
  CC      /tmp/tmp.Rr5xDuXo13/libsubcmd/subcmd-config.o
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/
  INSTALL libsubcmd_headers
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/hashmap.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/relo_core.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_internal.h
  PERF_VERSION = 6.3.rc1.g0b82b38b7b56
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/bpf_perf.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/core.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/cpumap.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/threadmap.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libsymbol/include/symbol/kallsyms.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libapi/include/api/cpu.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/evlist.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libapi/include/api/debug.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/evsel.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libapi/include/api/io.h
  GEN     perf-archive
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/event.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libapi/include/api/fd/array.h
  GEN     perf-iostat
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/perf/mmap.h
  CC      /tmp/tmp.Rr5xDuXo13/libperf/core.o
  CC      /tmp/tmp.Rr5xDuXo13/libsymbol/kallsyms.o
  CC      /tmp/tmp.Rr5xDuXo13/libapi/cpu.o
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/internal/cpumap.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libapi/include/api/fs/fs.h
  INSTALL /tmp/tmp.Rr5xDuXo13/libapi/include/api/fs/tracing_path.h
  MKDIR   /tmp/tmp.Rr5xDuXo13/libapi/fd/
  CC      /tmp/tmp.Rr5xDuXo13/libapi/debug.o
  CC      /tmp/tmp.Rr5xDuXo13/libapi/str_error_r.o
  CC      /tmp/tmp.Rr5xDuXo13/libperf/cpumap.o
  INSTALL libsymbol_headers
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/internal/evlist.h
  CC      /tmp/tmp.Rr5xDuXo13/libperf/threadmap.o
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/internal/evsel.h
  CC      /tmp/tmp.Rr5xDuXo13/libperf/evsel.o
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/internal/lib.h
  CC      /tmp/tmp.Rr5xDuXo13/libperf/evlist.o
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/internal/mmap.h
  MKDIR   /tmp/tmp.Rr5xDuXo13/libapi/fs/
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/internal/threadmap.h
  CC      /tmp/tmp.Rr5xDuXo13/libapi/fd/array.o
  MKDIR   /tmp/tmp.Rr5xDuXo13/libapi/fs/
  CC      /tmp/tmp.Rr5xDuXo13/libperf/mmap.o
  INSTALL /tmp/tmp.Rr5xDuXo13/libperf/include/internal/xyarray.h
  CC      /tmp/tmp.Rr5xDuXo13/libapi/fs/fs.o
  CC      /tmp/tmp.Rr5xDuXo13/libperf/zalloc.o
  CC      /tmp/tmp.Rr5xDuXo13/libperf/xyarray.o
  CC      /tmp/tmp.Rr5xDuXo13/libapi/fs/cgroup.o
  CC      /tmp/tmp.Rr5xDuXo13/libperf/lib.o
  INSTALL libapi_headers
  CC      /tmp/tmp.Rr5xDuXo13/libapi/fs/tracing_path.o
  INSTALL libperf_headers
  GEN     /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/bpf_helper_defs.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/btf.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_common.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_legacy.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_helpers.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_tracing.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_endian.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_core_read.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/skel_internal.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_version.h
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/usdt.bpf.h
  LD      /tmp/tmp.Rr5xDuXo13/libapi/fd/libapi-in.o
  LD      /tmp/tmp.Rr5xDuXo13/libsymbol/libsymbol-in.o
  AR      /tmp/tmp.Rr5xDuXo13/libsymbol/libsymbol.a
  LD      /tmp/tmp.Rr5xDuXo13/libapi/fs/libapi-in.o
  INSTALL /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_helper_defs.h
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  INSTALL libbpf_headers
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  LD      /tmp/tmp.Rr5xDuXo13/libapi/libapi-in.o
  MKDIR   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/bpf.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf_probes.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/hashmap.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/nlattr.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf_dump.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf_errno.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/str_error.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/netlink.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/ringbuf.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/bpf_prog_linfo.o
  LD      /tmp/tmp.Rr5xDuXo13/libperf/libperf-in.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/strset.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/linker.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/gen_loader.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/relo_core.o
  AR      /tmp/tmp.Rr5xDuXo13/libapi/libapi.a
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/usdt.o
  AR      /tmp/tmp.Rr5xDuXo13/libperf/libperf.a
  LD      /tmp/tmp.Rr5xDuXo13/libsubcmd/libsubcmd-in.o
  AR      /tmp/tmp.Rr5xDuXo13/libsubcmd/libsubcmd.a
  GEN     /tmp/tmp.Rr5xDuXo13/python/perf.cpython-311-x86_64-linux-gnu.so
  LD      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf-in.o
  LINK    /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/libbpf/libbpf.a
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/main.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/common.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/json_writer.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/gen.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/btf.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/xlated_dumper.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/btf_dumper.o
  CC      /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/disasm.o
  LINK    /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bootstrap/bpftool
  GEN     /tmp/tmp.Rr5xDuXo13/util/bpf_skel/vmlinux.h
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bpf_prog_profiler.bpf.o
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bperf_leader.bpf.o
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bperf_follower.bpf.o
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bperf_cgroup.bpf.o
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/func_latency.bpf.o
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/off_cpu.bpf.o
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/lock_contention.bpf.o
  CLANG   /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/kwork_trace.bpf.o
util/bpf_skel/lock_contention.bpf.c:192:7: error: call to undeclared function 'bpf_core_type_matches'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
                if (bpf_core_type_matches(struct rw_semaphore___old)) {
                    ^
util/bpf_skel/lock_contention.bpf.c:192:29: error: expected expression
                if (bpf_core_type_matches(struct rw_semaphore___old)) {
                                          ^
util/bpf_skel/lock_contention.bpf.c:195:36: error: expected expression
                } else if (bpf_core_type_matches(struct rw_semaphore___new)) {
                                                 ^
3 errors generated.
/usr/bin/ld: bpf architecture of input file `/tmp/bperf_follower-74fba5.o' is incompatible with i386:x86-64 output
/usr/bin/ld: bpf architecture of input file `/tmp/bperf_leader-b2ec61.o' is incompatible with i386:x86-64 output
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/12/../../../../lib64/crt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: final link failed: file in wrong format
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/12/../../../../lib64/crt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: final link failed: file in wrong format
collect2: error: ld returned 1 exit status
collect2: error: ld returned 1 exit status
clang-15: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
clang-15: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
/usr/bin/ld: bpf architecture of input file `/tmp/func_latency-70b7d4.o' is incompatible with i386:x86-64 output
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/lock_contention.bpf.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bperf_follower.bpf.o] Error 1
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bperf_leader.bpf.o] Error 1
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/12/../../../../lib64/crt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: final link failed: file in wrong format
collect2: error: ld returned 1 exit status
clang-15: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/func_latency.bpf.o] Error 1
/usr/bin/ld: bpf architecture of input file `/tmp/bpf_prog_profiler-6e9720.o' is incompatible with i386:x86-64 output
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/12/../../../../lib64/crt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: final link failed: file in wrong format
collect2: error: ld returned 1 exit status
clang-15: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bpf_prog_profiler.bpf.o] Error 1
/usr/bin/ld: bpf architecture of input file `/tmp/kwork_trace-8d5b4e.o' is incompatible with i386:x86-64 output
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/12/../../../../lib64/crt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: final link failed: file in wrong format
collect2: error: ld returned 1 exit status
clang-15: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/kwork_trace.bpf.o] Error 1
/usr/bin/ld: bpf architecture of input file `/tmp/off_cpu-1cb75d.o' is incompatible with i386:x86-64 output
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/12/../../../../lib64/crt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: final link failed: file in wrong format
collect2: error: ld returned 1 exit status
clang-15: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/off_cpu.bpf.o] Error 1
/usr/bin/ld: bpf architecture of input file `/tmp/bperf_cgroup-45eb44.o' is incompatible with i386:x86-64 output
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/12/../../../../lib64/crt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
/usr/bin/ld: final link failed: file in wrong format
collect2: error: ld returned 1 exit status
clang-15: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
make[4]: *** [Makefile.perf:1081: /tmp/tmp.Rr5xDuXo13/util/bpf_skel/.tmp/bperf_cgroup.bpf.o] Error 1
make[3]: *** [Makefile.perf:236: sub-make] Error 2
make[2]: *** [Makefile:70: all] Error 2
make[1]: *** [tests/make:326: make_libbpf_dynamic_O] Error 1
make: *** [Makefile:103: build-test] Error 2
make: Leaving directory '/var/home/acme/git/perf-tools-next/tools/perf'

real	5m55.192s
user	62m31.596s
sys	14m30.828s
⬢[acme@...lbox perf-tools-next]$