[缺陷描述]： perf-sanity-tests新增Basic_BPF_llvm_compile用例失败，报错：error: unknown target triple 'bpf', please use -triple or -arch 失败日志如下： # perf test -v 38 38: LLVM search and compile : 38.1: Basic BPF llvm compile : --- start --- test child forked, pid 28151 Kernel build dir is set to /lib/modules/4.19.91-27.4.an7.x86_64/build set env: KBUILD_DIR=/lib/modules/4.19.91-27.4.an7.x86_64/build unset env: KBUILD_OPTS include option is set to -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.8.5/include -I./arch/x86/include -I./arch/x86/include/generated -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h set env: NR_CPUS=8 set env: LINUX_VERSION_CODE=0x4135b set env: CLANG_EXEC=/bin/clang set env: CLANG_OPTIONS=-xc set env: KERNEL_INC_OPTIONS= -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.8.5/include -I./arch/x86/include -I./arch/x86/include/generated -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h set env: PERF_BPF_INC_OPTIONS=-I/usr/lib/perf/include/bpf set env: WORKING_DIR=/lib/modules/4.19.91-27.4.an7.x86_64/build set env: CLANG_SOURCE=- llvm compiling command template: echo '/* * bpf-script-example.c * Test basic LLVM building */ #ifndef LINUX_VERSION_CODE # error Need LINUX_VERSION_CODE # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig' #endif #define BPF_ANY 0 #define BPF_MAP_TYPE_ARRAY 2 #define BPF_FUNC_map_lookup_elem 1 #define BPF_FUNC_map_update_elem 2 static void *(*bpf_map_lookup_elem)(void *map, void *key) = (void *) BPF_FUNC_map_lookup_elem; static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) = (void *) BPF_FUNC_map_update_elem; struct bpf_map_def { unsigned int type; unsigned int key_size; unsigned int value_size; unsigned int max_entries; }; #define SEC(NAME) __attribute__((section(NAME), used)) struct bpf_map_def SEC("maps") flip_table = { .type = BPF_MAP_TYPE_ARRAY, .key_size = sizeof(int), .value_size = sizeof(int), .max_entries = 1, }; SEC("func=do_epoll_wait") int bpf_func__SyS_epoll_pwait(void *ctx) { int ind =0; int *flag = bpf_map_lookup_elem(&flip_table, &ind); int new_flag; if (!flag) return 0; /* flip flag and store back */ new_flag = !*flag; bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY); return new_flag; } char _license[] SEC("license") = "GPL"; int _version SEC("version") = LINUX_VERSION_CODE; ' | $CLANG_EXEC -D__KERNEL__ -D__NR_CPUS__=$NR_CPUS -DLINUX_VERSION_CODE=$LINUX_VERSION_CODE $CLANG_OPTIONS $KERNEL_INC_OPTIONS $PERF_BPF_INC_OPTIONS -Wno-unused-value -Wno-pointer-sign -working-directory $WORKING_DIR -c "$CLANG_SOURCE" -target bpf $CLANG_EMIT_LLVM -O2 -o - $LLVM_OPTIONS_PIPE llvm compiling command : echo '/* * bpf-script-example.c * Test basic LLVM building */ #ifndef LINUX_VERSION_CODE # error Need LINUX_VERSION_CODE # error Example: for 4.2 kernel, put 'clang-opt=-DLINUX_VERSION_CODE=0x40200 into llvm section of ~/.perfconfig' #endif #define BPF_ANY 0 #define BPF_MAP_TYPE_ARRAY 2 #define BPF_FUNC_map_lookup_elem 1 #define BPF_FUNC_map_update_elem 2 static void *(*bpf_map_lookup_elem)(void *map, void *key) = (void *) BPF_FUNC_map_lookup_elem; static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) = (void *) BPF_FUNC_map_update_elem; struct bpf_map_def { unsigned int type; unsigned int key_size; unsigned int value_size; unsigned int max_entries; }; #define SEC(NAME) __attribute__((section(NAME), used)) struct bpf_map_def SEC(maps) flip_table = { .type = BPF_MAP_TYPE_ARRAY, .key_size = sizeof(int), .value_size = sizeof(int), .max_entries = 1, }; SEC(func=do_epoll_wait) int bpf_func__SyS_epoll_pwait(void *ctx) { int ind =0; int *flag = bpf_map_lookup_elem(&flip_table, &ind); int new_flag; if (!flag) return 0; /* flip flag and store back */ new_flag = !*flag; bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY); return new_flag; } char _license[] SEC(license) = GPL; int _version SEC(version) = LINUX_VERSION_CODE; ' | /bin/clang -D__KERNEL__ -D__NR_CPUS__=8 -DLINUX_VERSION_CODE=0x4135b -xc -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.8.5/include -I./arch/x86/include -I./arch/x86/include/generated -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -I/usr/lib/perf/include/bpf -Wno-unused-value -Wno-pointer-sign -working-directory /lib/modules/4.19.91-27.4.an7.x86_64/build -c - -target bpf -O2 -o - error: unknown target triple 'bpf', please use -triple or -arch ERROR: unable to compile - Hint: Check error message shown above. Hint: You can also pre-compile it into .o using: clang -target bpf -O2 -c - with proper -I and -D options. Failed to compile test case: 'Basic BPF llvm compile' test child finished with -1 ---- end ---- LLVM search and compile subtest 1: FAILED! 38.2: kbuild searching : --- force skipped --- LLVM search and compile subtest 2: Skip 38.3: Compile source for BPF prologue generation : --- force skipped --- LLVM search and compile subtest 3: Skip 38.4: Compile source for BPF relocation : --- force skipped --- LLVM search and compile subtest 4: Skip [复现概率]： 必现 [复现环境]： 内核： 4.19.91-27.4.an7.x86_64 # cat /etc/os-release NAME="Anolis OS" VERSION="7.9" ID="anolis" ID_LIKE="rhel fedora centos" VERSION_ID="7.9" PRETTY_NAME="Anolis OS 7.9" ANSI_COLOR="0;31" HOME_URL="https://openanolis.cn/" BUG_REPORT_URL="https://bugs.openanolis.cn/" CENTOS_MANTISBT_PROJECT="CentOS-7" CENTOS_MANTISBT_PROJECT_VERSION="7" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="7" rpm信息： # perf -v perf version 4.19.91-27.4.an7.x86_64.debug # rpm -qa |grep clang clang-3.4.2-9.el7.x86_64 [复现步骤]： 1.安装和内核匹配的perf版本； 2.perf test -v 38 [预期结果]： 用例执行成功 [实际结果]： 用例执行失败