C语言编译报：warning: variable ‘X’ set but not used [-Wunused-but-set-variable], 如何消除warning？

C语言编译报：warning: variable ‘XXX’ set but not used [-Wunused-but-set-variable], 如何消除warning？

board/novatek/nvt-na51023/na51023_utils.c: In function ‘nvt_flash_mtdpart_config’:
board/novatek/nvt-na51023/na51023_utils.c:317:27: warning: variable ‘pst_part_num’ set but not used [-Wunused-but-set-variable]
  uint32_t i, j, part_num, pst_part_num;

int nvt_flash_mtdpart_config(char *p_cmdline, EMB_PARTITION *partition_ptr)
{
    MODELEXT_HEADER* header;
    EMB_PARTITION *p_partition;
    uint32_t i, j, part_num, pst_part_num;
    int ret = 0;
    char cmd[1024];
    char buf[1024];
    //struct spi_flash *flash = board_init_spi_flash;

    #if defined(CONFIG_NVT_LINUX_RAMDISK_BOOT) || defined(CONFIG_NVT_LINUX_AUTOLOAD)
        #if defined(CONFIG_NVT_SPI_NAND)
            nand_info_t *nand = &nand_info[0];
        #elif defined(CONFIG_NVT_SPI_NOR)
            struct spi_flash *spi_flash = board_init_spi_flash;
        #elif defined(CONFIG_NVT_IVOT_EMMC)
            struct mmc *mmc = find_mmc_device(CONFIG_NVT_IVOT_EMMC);
        #else
            return 0;
        #endif
    #elif defined(CONFIG_NVT_LINUX_SPINAND_BOOT)
    nand_info_t *nand = &nand_info[0];
    #elif defined(CONFIG_NVT_LINUX_EMMC_BOOT)
    struct mmc *mmc = find_mmc_device(CONFIG_NVT_IVOT_EMMC);
    #else
    struct spi_flash *spi_flash = board_init_spi_flash;
    #endif

    #if defined(CONFIG_NVT_LINUX_EMMC_BOOT)
    /* MMC device doesn't need to init mtdparts parameter */
    if (p_cmdline == NULL) {
        return 0;
    }
    #endif /* CONFIG_NVT_LINUX_EMMC_BOOT */

    if (partition_ptr == NULL) {
        p_partition = (EMB_PARTITION*)modelext_get_cfg((unsigned char*)CONFIG_MODELEXT_SDRAM_BASE, MODELEXT_TYPE_EMB_PARTITION, &header);
        if(!p_partition || !header){
            printf("partition//header is null\n");
            return -1;
        }
    } else {
        /* Receive partition table from argu */
        p_partition = partition_ptr;
    }

#if defined(CONFIG_NVT_LINUX_SPINAND_BOOT)
    sprintf(cmd, "nand0=spi_nand.0");
    ret = setenv("mtdids",cmd);
    if (ret) {
        printf("%s: error set\n", __func__);
        return ret;
    }

    sprintf(cmd,"mtdparts=spi_nand.0:");
    if (p_cmdline != NULL) {
            /* To find if mtdparts string existed. If yes, it needs to expand mtdparts environment */
            char *mtdparts_off = NULL;
                mtdparts_off = strstr ((char *)p_cmdline, "mtdparts=");
            if (mtdparts_off) {
                p_cmdline = mtdparts_off;
                *p_cmdline = '\0';
            }
            strcat(p_cmdline, "mtdparts=spi_nand.0:");
    }
#elif defined(CONFIG_NVT_IVOT_EMMC)
    if (p_cmdline != NULL) {
            /* To find if mtdparts string existed. If yes, it needs to expand mtdparts environment */
            char *nvtemmcpart_off = NULL;
            nvtemmcpart_off = strstr((char *)p_cmdline, "nvtemmcpart=");
            if (nvtemmcpart_off) {
                p_cmdline = nvtemmcpart_off;
                *p_cmdline = '\0';
            }
            strcat(p_cmdline, "nvtemmcpart=");
    }
#else
    sprintf(cmd, "sf0=spi_nor.0");
    ret = setenv("mtdids",cmd);
    if (ret) {
        printf("%s: error set\n", __func__);
        return ret;
    }

    sprintf(cmd,"mtdparts=spi_nor.0:");
    if (p_cmdline != NULL) {
            /* To find if mtdparts string existed. If yes, it needs to expand mtdparts environment */
            char *mtdparts_off = NULL;
                mtdparts_off = strstr ((char *)p_cmdline, "mtdparts=");
            if (mtdparts_off) {
                p_cmdline = mtdparts_off;
                *p_cmdline = '\0';
            }
            strcat(p_cmdline, "mtdparts=spi_nor.0:");
    }
#endif
    j = 0;
    part_num = 0;
    pst_part_num = 0;
    /* To parse mtdparts for rootfs partition table */
    for (i = 0 ; i < EMB_PARTITION_INFO_COUNT ; i++) {
        const EMB_PARTITION* p = p_partition + i;
        unsigned int PartitionSize = 0, PartitionOffset = 0;
        #if defined(CONFIG_NVT_SPI_NAND)
        PartitionSize = p->PartitionSize * nand->erasesize;
        PartitionOffset = p->PartitionOffset * nand->erasesize;
        #elif defined(CONFIG_NVT_IVOT_EMMC)
        PartitionSize = p->PartitionSize;
        PartitionOffset = p->PartitionOffset;
        #else
        PartitionSize = p->PartitionSize * CONFIG_ENV_SECT_SIZE;
        PartitionOffset = p->PartitionOffset * CONFIG_ENV_SECT_SIZE;
        #endif
        if(p->PartitionSize == 0)
            continue;

        switch(p->EmbType)
        {
        case EMBTYPE_LOADER:
            sprintf(buf, "0x%x@0x%x(loader),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(loader),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_MODELEXT:
            sprintf(buf, "0x%x@0x%x(modelext),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(modelext),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_UITRON:
            sprintf(buf, "0x%x@0x%x(uitron),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(uitron),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_ECOS:
            sprintf(buf, "0x%x@0x%x(ecos),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(ecos),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_UBOOT:
            sprintf(buf, "0x%x@0x%x(uboot),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(uboot),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_UENV:
            sprintf(buf, "0x%x@0x%x(uenv),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_LINUX:
            sprintf(buf, "0x%x@0x%x(linux),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(linux),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_RAMFS:
            sprintf(buf, "0x%x@0x%x(ramfs),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_ROOTFS:
            sprintf(buf, "0x%x@0x%x(rootfs),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                strcat(p_cmdline, buf);
                if (part_num == 0) {
                    #if !defined(CONFIG_NVT_IVOT_EMMC)
                    part_num = j;
                    #else
                    if (p->OrderIdx == 0)
                        part_num = ++j;
                    #endif
                }
            }
            break;
        case EMBTYPE_FAT:
            sprintf(buf, "0x%x@0x%x(fat),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_DSP:
            sprintf(buf, "0x%x@0x%x(dsp%d),", PartitionSize, PartitionOffset, p->OrderIdx);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(dsp%d),", PartitionSize, PartitionOffset, p->OrderIdx);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_PSTORE:
            sprintf(buf, "0x%x@0x%x(pstore),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(pstore),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if defined(CONFIG_NVT_IVOT_EMMC)
                pst_part_num = ++j;
                #else
                j++;
                #endif
            }
            break;
#if (defined(_UITRON_DUAL_IMAGE_ON_))
        case EMBTYPE_UITRON_BACKUP:
            sprintf(buf, "0x%x@0x%x(uitron_backup),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(uitron_backup),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        case EMBTYPE_MODELEXT_BACKUP:
            sprintf(buf, "0x%x@0x%x(modelext_backup),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(modelext_backup),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
#endif
        default:
            sprintf(buf, "0x%x@0x%x(user),", PartitionSize, PartitionOffset);
            strcat(cmd, buf);
            if (p_cmdline != NULL) {
                sprintf(buf, "0x%x@0x%x(user),", PartitionSize, PartitionOffset);
                strcat(p_cmdline, buf);
                #if !defined(CONFIG_NVT_IVOT_EMMC)
                j++;
                #endif
            }
            break;
        }
    }

    if (p_cmdline != NULL) {
        /* To add entire nand mtd device */
        #if defined(CONFIG_NVT_SPI_NAND)
        sprintf(buf, "0x%llx@0(total),", nand->size);
        #elif defined(CONFIG_NVT_SPI_NOR)
        sprintf(buf, "0x%x@0(total),", spi_flash->size);
        #elif defined(CONFIG_NVT_IVOT_EMMC)
        sprintf(buf, "0x%llx@0(total),", mmc->capacity/MMC_MAX_BLOCK_LEN);
        #endif
        strcat(p_cmdline, buf);
        /*
         * Add bootarg rootfs extension parameter
         */
        p_cmdline[strlen(p_cmdline) - 1] = ' ';
        #if defined(CONFIG_NVT_UBIFS_SUPPORT)
        sprintf(buf," ubi.mtd=%d ", part_num);
        strcat(p_cmdline, buf);
        #elif defined(CONFIG_NVT_EXT4_SUPPORT)
        sprintf(buf," root=/dev/mmcblk2p%d nvt_pst=/dev/mmcblk2p%d ", part_num, pst_part_num);
        strcat(p_cmdline, buf);
        #else
        /*
         * To handle non-ubifs rootfs type (squashfs/jffs2)
         */
        sprintf(buf," root=/dev/mtdblock%d ", part_num);
        strcat(p_cmdline, buf);
        #endif /* _NVT_ROOTFS_TYPE_ */
    }

    /* To handle uboot mtd env config */
    cmd[strlen(cmd) - 1] = '\0';
    ret = setenv("mtdparts",cmd);

    return ret;
}

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於黾 2023-03-27 11:16
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#elif是在编译阶段执行的，所以当条件CONFIG_NVT_EXT4_SUPPORT不满足的时候，
sprintf(buf," root=/dev/mmcblk2p%d nvt_pst=/dev/mmcblk2p%d ", part_num, pst_part_num);根本不会被编译
那么变量pst_part_num只定义赋值了而不取值肯定要报警告的

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C语言编译报：warning: variable ‘X’ set but not used [-Wunused-but-set-variable], 如何消除warning？

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