3861编译失败，报错[OHOS ERROR] Fatal error: invalid -march= option: `rv32imac'

### 该问题是怎么引起的？
按照指导书完成3861编译环境配置，执行编译命令失败
https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/Hi3861搭建环境.md

### 重现步骤
hb build

### 报错信息
OHOS ERROR] [3/293] gcc cross compiler obj/base/hiviewdfx/hievent_lite/frameworks/libhievent_lite.hiview_event.o
[OHOS ERROR] FAILED: obj/base/hiviewdfx/hievent_lite/frameworks/libhievent_lite.hiview_event.o
[OHOS ERROR] riscv32-unknown-elf-gcc -D_XOPEN_SOURCE=700 -DOHOS_DEBUG -D__LITEOS__ -D__LITEOS_M__ -I../../../base/hiviewdfx/hievent_lite/interfaces/native/innerkits -I../../../base/hiviewdfx/hiview_lite -I../../../foundation/distributedschedule/samgr_lite/interfaces/kits/samgr -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/system/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/config -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/config/nv -I../../../utils/native/lite/include -I../../../kernel/liteos_m/kal/cmsis -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/kernel/base/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/targets/hi3861v100/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/kernel/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/arch/risc-v/rv32im -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libm/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libsec/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/net/wpa_supplicant-2.7/src/common -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/targets/hi3861v100/plat/riscv -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/kernel/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/kernel/extended/runstop -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/posix/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/linux/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/third_party/lwip_sack/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libc/musl/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libc/musl/arch/generic -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libc/musl/arch/riscv32 -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libc/hw/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libc/nuttx/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libsec/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/targets/hi3861v100/config -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/targets/hi3861v100/user -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/targets/hi3861v100/plat -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/targets/hi3861v100/extend/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/arch -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/components/lib/libc/bionic/libm -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/shell/include -I../../../device/hisilicon/hispark_pegasus/sdk_liteos/platform/os/Huawei_LiteOS/net/telnet/include -Wall -Os -mabi=ilp32 -falign-functions=2 -msave-restore -fno-optimize-strlen -freorder-blocks-algorithm=simple -fno-schedule-insns -fno-inline-small-functions -fno-inline-functions-called-once -mtune=size -mno-small-data-limit=0 -fno-aggressive-loop-optimizations -std=c99 -Wpointer-arith -Wstrict-prototypes -ffunction-sections -fdata-sections -fno-exceptions -fno-short-enums -Wextra -Wundef -U PRODUCT_CFG_BUILD_TIME -DLOS_COMPILE_LDM -DPRODUCT_USR_SOFT_VER_STR=None -DCYGPKG_POSIX_SIGNALS -D__ECOS__ -D__RTOS_ -DPRODUCT_CFG_HAVE_FEATURE_SYS_ERR_INFO -D__LITEOS__ -DLIB_CONFIGURABLE -DLOSCFG_SHELL -DLOSCFG_CACHE_STATICS -DCUSTOM_AT_COMMAND -DLOS_COMPILE_LDM -DLOS_CONFIG_IPERF3 -DCMSIS_OS_VER=2 -DSECUREC_ENABLE_SCANF_FILE=0 -DCONFIG_AT_COMMAND -DPRODUCT_CFG_CHIP_VER_STR=Hi3861V100 -DCHIP_VER_Hi3861 -DPRODUCT_CFG_SOFT_VER_STR=Hi3861 -DHI_BOARD_ASIC -DHI_ON_FLASH -DLITEOS_WIFI_IOT_VERSION -march=rv32imac -nostdlib -fno-common -fno-builtin -fno-strict-aliasing -Wall -fsigned-char -fstack-protector-all -std=c99 -c ../../../base/hiviewdfx/hievent_lite/frameworks/hiview_event.c -o obj/base/hiviewdfx/hievent_lite/frameworks/libhievent_lite.hiview_event.o
[OHOS ERROR] Assembler messages:
[OHOS ERROR] Fatal error: invalid -march= option: `rv32imac'

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