storage size of ‘XXX’ isn’t known

最新推荐文章于 2023-07-20 16:52:42 发布
原创 最新推荐文章于 2023-07-20 16:52:42 发布 · 9.4k 阅读 · 4 ·
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#c语言编译

本文探讨了在使用GCC编译器时出现的“storagesizeof‘at_static_client_t’isn’tknown”错误，并提供了两种解决方案：一种是在源文件中包含更多的头文件，另一种是在相关头文件之间建立正确的依赖关系。

假设有三个文件a.c / b.h/  c. h

a.c的内容如下

#include   "c.h"
mqtt_client_t at_static_client_t;
/* 逻辑部分 */

b.h的内容如下 

/* 头文件部分 */
struct mqtt_client_s
{
结构体内容
}

c.h的内容如下 

/*头文件*/
typedef struct mqtt_client_s mqtt_client_t;

此时在GCC编译会报错 storage size of ‘at_static_client_t’ isn’t known 如果在a.c中再include b.h 这个问题就解决了，因为最终的定义部分也引用了。

但是，如果在c.h中引用b.h，在a.c中不做改的呢，此时编译报错，猜测可能是b.h 和 c.h耦合严重导致的，所以只能在第三个文件中同时引用，如果

二者不冲突，按照这种改法是否可行还有待验证。


如果有大神遇到过类似问题，请不吝留言指教。

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CANopenLinux/CO_error.h:103:21: error: field ‘timestamp’ has incomplete type 103 | struct timespec timestamp; /**< listen only mode started at this time */ | ^~~~~~~~~ CANopenLinux/CO_driver.c:40:1: error: unknown type name ‘pthread_mutex_t’ 40 | pthread_mutex_t CO_EMCY_mutex = PTHREAD_MUTEX_INITIALIZER; | ^~~~~~~~~~~~~~~ CANopenLinux/CO_dCANopenLinux/CO_error.h:103:21: error: field ‘timestamp’ has incomplete type 103 | struct timespec timestamp; /**< listen only mode started at this time */ | ^~~~~~~~~ CANopenLinux/CO_driver.c:40:1: error: unknown type name ‘pthread_mutex_t’ 40 | pthread_mutex_t CO_EMCY_mutex = PTHREAD_MUTEX_INITIALIZER; | ^~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c:40:33: error: ‘PTHREAD_MUTEX_INITIALIZER’ undeclared here (not in a function) 40 | pthread_mutex_t CO_EMCY_mutex = PTHREAD_MUTEX_INITIALIZER; | ^~~~~~~~~~~~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c:41:1: error: unknown type name ‘pthread_mutex_t’ 41 | pthread_mutex_t CO_OD_mutex = PTHREAD_MUTEX_INITIALIZER; | ^~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c: In function ‘disableRx’: CANopenLinux/CO_driver.c:95:30: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 95 | for (i = 0; i < CANmodule->CANinterfaceCount; i++) { | ^~ CANopenLinux/CO_driver.c:96:39: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 96 | int ret = setsockopt(CANmodule->CANinterfaces[i].fd, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0); | ^~ CANopenLinux/CO_driver.c:98:61: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 98 | log_printf(LOG_ERR, CAN_FILTER_FAILED, CANmodule->CANinterfaces[i].ifName); | ^~ CANopenLinux/CO_driver.c: In function ‘setRxFilters’: CANopenLinux/CO_driver.c:119:23: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 119 | if ((CANmodule->rxFilter[i].can_id != 0) || (CANmodule->rxFilter[i].can_mask != 0)) { | ^~ CANopenLinux/CO_driver.c:119:63: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 119 | if ((CANmodule->rxFilter[i].can_id != 0) || (CANmodule->rxFilter[i].can_mask != 0)) { | ^~ CANopenLinux/CO_driver.c:121:44: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 121 | rxFiltersCpy[count] = CANmodule->rxFilter[i]; | ^~ CANopenLinux/CO_driver.c:133:30: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 133 | for (i = 0; i < CANmodule->CANinterfaceCount; i++) { | ^~ CANopenLinux/CO_driver.c:134:39: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 134 | int ret = setsockopt(CANmodule->CANinterfaces[i].fd, SOL_CAN_RAW, CAN_RAW_FILTER, rxFiltersCpy, | ^~ CANopenLinux/CO_driver.c:137:61: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 137 | log_printf(LOG_ERR, CAN_FILTER_FAILED, CANmodule->CANinterfaces[i].ifName); | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_init’: CANopenLinux/CO_driver.c:178:5: error: unknown type name ‘CO_CANptrSocketCan_t’ 178 | CO_CANptrSocketCan_t* CANptrReal = (CO_CANptrSocketCan_t*)CANptr; | ^~~~~~~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c:178:41: error: ‘CO_CANptrSocketCan_t’ undeclared (first use in this function) 178 | CO_CANptrSocketCan_t* CANptrReal = (CO_CANptrSocketCan_t*)CANptr; | ^~~~~~~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c:178:41: note: each undeclared identifier is reported only once for each function it appears in CANopenLinux/CO_driver.c:178:62: error: expected expression before ‘)’ token 178 | CO_CANptrSocketCan_t* CANptrReal = (CO_CANptrSocketCan_t*)CANptr; | ^ CANopenLinux/CO_driver.c:181:14: error: ‘CO_CANmodule_t’ has no member named ‘epoll_fd’ 181 | CANmodule->epoll_fd = CANptrReal->epoll_fd; | ^~ CANopenLinux/CO_driver.c:181:37: error: request for member ‘epoll_fd’ in something not a structure or union 181 | CANmodule->epoll_fd = CANptrReal->epoll_fd; | ^~ CANopenLinux/CO_driver.c:182:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 182 | CANmodule->CANinterfaces = NULL; | ^~ CANopenLinux/CO_driver.c:183:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 183 | CANmodule->CANinterfaceCount = 0; | ^~ CANopenLinux/CO_driver.c:201:14: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 201 | CANmodule->rxFilter = calloc(CANmodule->rxSize, sizeof(struct can_filter)); | ^~ CANopenLinux/CO_driver.c:202:18: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 202 | if (CANmodule->rxFilter == NULL) { | ^~ CANopenLinux/CO_driver.c:209:27: warning: conversion from ‘unsigned int’ to ‘uint16_t’ {aka ‘short unsigned int’} changes value from ‘4294967295’ to ‘65535’ [-Woverflow] 209 | rxArray[i].mask = 0xFFFFFFFFU; | ^~~~~~~~~~~ CANopenLinux/CO_driver.c:212:19: error: ‘CO_CANrx_t’ has no member named ‘can_ifindex’ 212 | rxArray[i].can_ifindex = 0; | ^ CANopenLinux/CO_driver.c:213:19: error: ‘CO_CANrx_t’ has no member named ‘timestamp’ 213 | rxArray[i].timestamp.tv_sec = 0; | ^ CANopenLinux/CO_driver.c:214:19: error: ‘CO_CANrx_t’ has no member named ‘timestamp’ 214 | rxArray[i].timestamp.tv_nsec = 0; | ^ CANopenLinux/CO_driver.c:219:58: error: request for member ‘can_ifindex’ in something not a structure or union 219 | ret = CO_CANmodule_addInterface(CANmodule, CANptrReal->can_ifindex); | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_addInterface’: CANopenLinux/CO_driver.c:239:5: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 239 | CO_CANinterface_t* interface; | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:241:12: error: variable ‘ev’ has initializer but incomplete type 241 | struct epoll_event ev = {0}; | ^~~~~~~~~~~ CANopenLinux/CO_driver.c:241:30: warning: excess elements in struct initializer 241 | struct epoll_event ev = {0}; | ^ CANopenLinux/CO_driver.c:241:30: note: (near initialization for ‘ev’) CANopenLinux/CO_driver.c:241:24: error: storage size of ‘ev’ isn’t known 241 | struct epoll_event ev = {0}; | ^~ CANopenLinux/CO_driver.c:252:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 252 | CANmodule->CANinterfaceCount++; | ^~ CANopenLinux/CO_driver.c:253:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 253 | CANmodule->CANinterfaces = realloc(CANmodule->CANinterfaces, | ^~ CANopenLinux/CO_driver.c:253:49: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 253 | CANmodule->CANinterfaces = realloc(CANmodule->CANinterfaces, | ^~ CANopenLinux/CO_driver.c:254:51: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 254 | ((CANmodule->CANinterfaceCount) * sizeof(*CANmodule->CANinterfaces))); | ^~ CANopenLinux/CO_driver.c:254:91: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 254 | ((CANmodule->CANinterfaceCount) * sizeof(*CANmodule->CANinterfaces))); | ^~ CANopenLinux/CO_driver.c:255:18: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 255 | if (CANmodule->CANinterfaces == NULL) { | ^~ CANopenLinux/CO_driver.c:259:27: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 259 | interface = &CANmodule->CANinterfaces[CANmodule->CANinterfaceCount - 1]; | ^~ CANopenLinux/CO_driver.c:259:52: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 259 | interface = &CANmodule->CANinterfaces[CANmodule->CANinterfaceCount - 1]; | ^~ CANopenLinux/CO_driver.c:261:14: error: request for member ‘can_ifindex’ in something not a structure or union 261 | interface->can_ifindex = can_ifindex; | ^~ CANopenLinux/CO_driver.c:262:51: error: request for member ‘ifName’ in something not a structure or union 262 | ifName = if_indextoname(can_ifindex, interface->ifName); | ^~ CANopenLinux/CO_driver.c:269:14: error: request for member ‘fd’ in something not a structure or union 269 | interface->fd = socket(PF_CAN, SOCK_RAW, CAN_RAW); | ^~ CANopenLinux/CO_driver.c:270:18: error: request for member ‘fd’ in something not a structure or union 270 | if (interface->fd < 0) { | ^~ CANopenLinux/CO_driver.c:277:31: error: request for member ‘fd’ in something not a structure or union 277 | ret = setsockopt(interface->fd, SOL_SOCKET, SO_RXQ_OVFL, &tmp, sizeof(tmp)); | ^~ CANopenLinux/CO_driver.c:285:31: error: request for member ‘fd’ in something not a structure or union 285 | ret = setsockopt(interface->fd, SOL_SOCKET, SO_TIMESTAMPING, &tmp, sizeof(tmp)); | ^~ CANopenLinux/CO_driver.c:298:25: error: request for member ‘fd’ in something not a structure or union 298 | getsockopt(interface->fd, SOL_SOCKET, SO_RCVBUF, (void*)&bytes, &sLen); | ^~ CANopenLinux/CO_driver.c:300:60: error: request for member ‘ifName’ in something not a structure or union 300 | log_printf(LOG_INFO, CAN_SOCKET_BUF_SIZE, interface->ifName, bytes / 446, bytes); | ^~ CANopenLinux/CO_driver.c:307:25: error: request for member ‘fd’ in something not a structure or union 307 | ret = bind(interface->fd, (struct sockaddr*)&sockAddr, sizeof(sockAddr)); | ^~ CANopenLinux/CO_driver.c:309:58: error: request for member ‘ifName’ in something not a structure or union 309 | log_printf(LOG_ERR, CAN_BINDING_FAILED, interface->ifName); | ^~ CANopenLinux/CO_driver.c:331:17: error: ‘EPOLLIN’ undeclared (first use in this function) 331 | ev.events = EPOLLIN; | ^~~~~~~ CANopenLinux/CO_driver.c:332:27: error: request for member ‘fd’ in something not a structure or union 332 | ev.data.fd = interface->fd; | ^~ CANopenLinux/CO_driver.c:333:11: warning: implicit declaration of function ‘epoll_ctl’ [-Wimplicit-function-declaration] 333 | ret = epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_ADD, ev.data.fd, &ev); | ^~~~~~~~~ CANopenLinux/CO_driver.c:333:30: error: ‘CO_CANmodule_t’ has no member named ‘epoll_fd’ 333 | ret = epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_ADD, ev.data.fd, &ev); | ^~ CANopenLinux/CO_driver.c:333:42: error: ‘EPOLL_CTL_ADD’ undeclared (first use in this function) 333 | ret = epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_ADD, ev.data.fd, &ev); | ^~~~~~~~~~~~~ CANopenLinux/CO_driver.c:241:24: warning: unused variable ‘ev’ [-Wunused-variable] 241 | struct epoll_event ev = {0}; | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_disable’: CANopenLinux/CO_driver.c:356:30: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 356 | for (i = 0; i < CANmodule->CANinterfaceCount; i++) { | ^~ CANopenLinux/CO_driver.c:357:9: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 357 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[i]; | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:357:50: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 357 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[i]; | ^~ CANopenLinux/CO_driver.c:363:28: error: ‘CO_CANmodule_t’ has no member named ‘epoll_fd’ 363 | epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_DEL, interface->fd, NULL); | ^~ CANopenLinux/CO_driver.c:363:40: error: ‘EPOLL_CTL_DEL’ undeclared (first use in this function) 363 | epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_DEL, interface->fd, NULL); | ^~~~~~~~~~~~~ CANopenLinux/CO_driver.c:363:64: error: request for member ‘fd’ in something not a structure or union 363 | epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_DEL, interface->fd, NULL); | ^~ CANopenLinux/CO_driver.c:364:24: error: request for member ‘fd’ in something not a structure or union 364 | close(interface->fd); | ^~ CANopenLinux/CO_driver.c:365:18: error: request for member ‘fd’ in something not a structure or union 365 | interface->fd = -1; | ^~ CANopenLinux/CO_driver.c:367:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 367 | CANmodule->CANinterfaceCount = 0; | ^~ CANopenLinux/CO_driver.c:368:18: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 368 | if (CANmodule->CANinterfaces != NULL) { | ^~ CANopenLinux/CO_driver.c:369:23: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 369 | free(CANmodule->CANinterfaces); | ^~ CANopenLinux/CO_driver.c:371:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 371 | CANmodule->CANinterfaces = NULL; 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| ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANtxBufferInit’: CANopenLinux/CO_driver.c:467:15: error: ‘CO_CANtx_t’ has no member named ‘can_ifindex’ 467 | buffer->can_ifindex = 0; | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANsend’: CANopenLinux/CO_driver.c:631:57: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 631 | if (CANmodule == NULL || buffer == NULL || CANmodule->CANinterfaceCount == 0) { | ^~ CANopenLinux/CO_driver.c:635:5: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 635 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[0]; | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:635:46: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 635 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[0]; | ^~ CANopenLinux/CO_driver.c:636:39: error: request for member ‘fd’ in something not a structure or union 636 | if (interface == NULL || interface->fd < 0) { | ^~ CANopenLinux/CO_driver.c:645:72: error: request for member ‘ifName’ in something not a structure or union 645 | log_printf(LOG_ERR, DBG_CAN_TX_FAILED, buffer->ident, interface->ifName); | ^~ CANopenLinux/CO_driver.c:650:31: error: request for member ‘fd’ in something not a structure or union 650 | ssize_t n = send(interface->fd, buffer, CAN_MTU, MSG_DONTWAIT); | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_process’: CANopenLinux/CO_driver.c:686:39: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 686 | if (CANmodule == NULL || CANmodule->CANinterfaceCount == 0) { | ^~ CANopenLinux/CO_driver.c: At top level: CANopenLinux/CO_driver.c:726:39: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 726 | CO_CANread(CO_CANmodule_t* CANmodule, CO_CANinterface_t* interface, | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:784:13: error: unknown type name ‘CO_CANrxMsg_t’; did you mean ‘CO_CANrx_t’? 784 | CO_CANrxMsg_t* buffer) /* If not NULL, msg will be copied to buffer */ | ^~~~~~~~~~~~~ | CO_CANrx_t CANopenLinux/CO_driver.c:824:70: error: unknown type name ‘CO_CANrxMsg_t’; did you mean ‘CO_CANrx_t’? 824 | xFromEpoll(CO_CANmodule_t* CANmodule, struct epoll_event* ev, CO_CANrxMsg_t* buffer, int32_t* msgIndex) { river.c:40:33: error: ‘PTHREAD_MUTEX_INITIALIZER’ undeclared here (not in a function) 40 | pthread_mutex_t CO_EMCY_mutex = PTHREAD_MUTEX_INITIALIZER; | ^~~~~~~~~~~~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c:41:1: error: unknown type name ‘pthread_mutex_t’ 41 | pthread_mutex_t CO_OD_mutex = PTHREAD_MUTEX_INITIALIZER; | ^~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c: In function ‘disableRx’: CANopenLinux/CO_driver.c:95:30: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 95 | for (i = 0; i < CANmodule->CANinterfaceCount; i++) { | ^~ CANopenLinux/CO_driver.c:96:39: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 96 | int ret = setsockopt(CANmodule->CANinterfaces[i].fd, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0); | ^~ CANopenLinux/CO_driver.c:98:61: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 98 | log_printf(LOG_ERR, CAN_FILTER_FAILED, CANmodule->CANinterfaces[i].ifName); | ^~ CANopenLinux/CO_driver.c: In function ‘setRxFilters’: CANopenLinux/CO_driver.c:119:23: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 119 | if ((CANmodule->rxFilter[i].can_id != 0) || (CANmodule->rxFilter[i].can_mask != 0)) { | ^~ CANopenLinux/CO_driver.c:119:63: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 119 | if ((CANmodule->rxFilter[i].can_id != 0) || (CANmodule->rxFilter[i].can_mask != 0)) { | ^~ CANopenLinux/CO_driver.c:121:44: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 121 | rxFiltersCpy[count] = CANmodule->rxFilter[i]; | ^~ CANopenLinux/CO_driver.c:133:30: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 133 | for (i = 0; i < CANmodule->CANinterfaceCount; i++) { | ^~ CANopenLinux/CO_driver.c:134:39: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 134 | int ret = setsockopt(CANmodule->CANinterfaces[i].fd, SOL_CAN_RAW, CAN_RAW_FILTER, rxFiltersCpy, | ^~ CANopenLinux/CO_driver.c:137:61: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 137 | log_printf(LOG_ERR, CAN_FILTER_FAILED, CANmodule->CANinterfaces[i].ifName); | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_init’: CANopenLinux/CO_driver.c:178:5: error: unknown type name ‘CO_CANptrSocketCan_t’ 178 | CO_CANptrSocketCan_t* CANptrReal = (CO_CANptrSocketCan_t*)CANptr; | ^~~~~~~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c:178:41: error: ‘CO_CANptrSocketCan_t’ undeclared (first use in this function) 178 | CO_CANptrSocketCan_t* CANptrReal = (CO_CANptrSocketCan_t*)CANptr; | ^~~~~~~~~~~~~~~~~~~~ CANopenLinux/CO_driver.c:178:41: note: each undeclared identifier is reported only once for each function it appears in CANopenLinux/CO_driver.c:178:62: error: expected expression before ‘)’ token 178 | CO_CANptrSocketCan_t* CANptrReal = (CO_CANptrSocketCan_t*)CANptr; | ^ CANopenLinux/CO_driver.c:181:14: error: ‘CO_CANmodule_t’ has no member named ‘epoll_fd’ 181 | CANmodule->epoll_fd = CANptrReal->epoll_fd; | ^~ CANopenLinux/CO_driver.c:181:37: error: request for member ‘epoll_fd’ in something not a structure or union 181 | CANmodule->epoll_fd = CANptrReal->epoll_fd; | ^~ CANopenLinux/CO_driver.c:182:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 182 | CANmodule->CANinterfaces = NULL; | ^~ CANopenLinux/CO_driver.c:183:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 183 | CANmodule->CANinterfaceCount = 0; | ^~ CANopenLinux/CO_driver.c:201:14: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 201 | CANmodule->rxFilter = calloc(CANmodule->rxSize, sizeof(struct can_filter)); | ^~ CANopenLinux/CO_driver.c:202:18: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 202 | if (CANmodule->rxFilter == NULL) { | ^~ CANopenLinux/CO_driver.c:209:27: warning: conversion from ‘unsigned int’ to ‘uint16_t’ {aka ‘short unsigned int’} changes value from ‘4294967295’ to ‘65535’ [-Woverflow] 209 | rxArray[i].mask = 0xFFFFFFFFU; | ^~~~~~~~~~~ CANopenLinux/CO_driver.c:212:19: error: ‘CO_CANrx_t’ has no member named ‘can_ifindex’ 212 | rxArray[i].can_ifindex = 0; | ^ CANopenLinux/CO_driver.c:213:19: error: ‘CO_CANrx_t’ has no member named ‘timestamp’ 213 | rxArray[i].timestamp.tv_sec = 0; | ^ CANopenLinux/CO_driver.c:214:19: error: ‘CO_CANrx_t’ has no member named ‘timestamp’ 214 | rxArray[i].timestamp.tv_nsec = 0; | ^ CANopenLinux/CO_driver.c:219:58: error: request for member ‘can_ifindex’ in something not a structure or union 219 | ret = CO_CANmodule_addInterface(CANmodule, CANptrReal->can_ifindex); | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_addInterface’: CANopenLinux/CO_driver.c:239:5: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 239 | CO_CANinterface_t* interface; | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:241:12: error: variable ‘ev’ has initializer but incomplete type 241 | struct epoll_event ev = {0}; | ^~~~~~~~~~~ CANopenLinux/CO_driver.c:241:30: warning: excess elements in struct initializer 241 | struct epoll_event ev = {0}; | ^ CANopenLinux/CO_driver.c:241:30: note: (near initialization for ‘ev’) CANopenLinux/CO_driver.c:241:24: error: storage size of ‘ev’ isn’t known 241 | struct epoll_event ev = {0}; | ^~ CANopenLinux/CO_driver.c:252:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 252 | CANmodule->CANinterfaceCount++; | ^~ CANopenLinux/CO_driver.c:253:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 253 | CANmodule->CANinterfaces = realloc(CANmodule->CANinterfaces, | ^~ CANopenLinux/CO_driver.c:253:49: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 253 | CANmodule->CANinterfaces = realloc(CANmodule->CANinterfaces, | ^~ CANopenLinux/CO_driver.c:254:51: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 254 | ((CANmodule->CANinterfaceCount) * sizeof(*CANmodule->CANinterfaces))); | ^~ CANopenLinux/CO_driver.c:254:91: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 254 | ((CANmodule->CANinterfaceCount) * sizeof(*CANmodule->CANinterfaces))); | ^~ CANopenLinux/CO_driver.c:255:18: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 255 | if (CANmodule->CANinterfaces == NULL) { | ^~ CANopenLinux/CO_driver.c:259:27: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 259 | interface = &CANmodule->CANinterfaces[CANmodule->CANinterfaceCount - 1]; | ^~ CANopenLinux/CO_driver.c:259:52: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 259 | interface = &CANmodule->CANinterfaces[CANmodule->CANinterfaceCount - 1]; | ^~ CANopenLinux/CO_driver.c:261:14: error: request for member ‘can_ifindex’ in something not a structure or union 261 | interface->can_ifindex = can_ifindex; | ^~ CANopenLinux/CO_driver.c:262:51: error: request for member ‘ifName’ in something not a structure or union 262 | ifName = if_indextoname(can_ifindex, interface->ifName); | ^~ CANopenLinux/CO_driver.c:269:14: error: request for member ‘fd’ in something not a structure or union 269 | interface->fd = socket(PF_CAN, SOCK_RAW, CAN_RAW); | ^~ CANopenLinux/CO_driver.c:270:18: error: request for member ‘fd’ in something not a structure or union 270 | if (interface->fd < 0) { | ^~ CANopenLinux/CO_driver.c:277:31: error: request for member ‘fd’ in something not a structure or union 277 | ret = setsockopt(interface->fd, SOL_SOCKET, SO_RXQ_OVFL, &tmp, sizeof(tmp)); | ^~ CANopenLinux/CO_driver.c:285:31: error: request for member ‘fd’ in something not a structure or union 285 | ret = setsockopt(interface->fd, SOL_SOCKET, SO_TIMESTAMPING, &tmp, sizeof(tmp)); | ^~ CANopenLinux/CO_driver.c:298:25: error: request for member ‘fd’ in something not a structure or union 298 | getsockopt(interface->fd, SOL_SOCKET, SO_RCVBUF, (void*)&bytes, &sLen); | ^~ CANopenLinux/CO_driver.c:300:60: error: request for member ‘ifName’ in something not a structure or union 300 | log_printf(LOG_INFO, CAN_SOCKET_BUF_SIZE, interface->ifName, bytes / 446, bytes); | ^~ CANopenLinux/CO_driver.c:307:25: error: request for member ‘fd’ in something not a structure or union 307 | ret = bind(interface->fd, (struct sockaddr*)&sockAddr, sizeof(sockAddr)); | ^~ CANopenLinux/CO_driver.c:309:58: error: request for member ‘ifName’ in something not a structure or union 309 | log_printf(LOG_ERR, CAN_BINDING_FAILED, interface->ifName); | ^~ CANopenLinux/CO_driver.c:331:17: error: ‘EPOLLIN’ undeclared (first use in this function) 331 | ev.events = EPOLLIN; | ^~~~~~~ CANopenLinux/CO_driver.c:332:27: error: request for member ‘fd’ in something not a structure or union 332 | ev.data.fd = interface->fd; | ^~ CANopenLinux/CO_driver.c:333:11: warning: implicit declaration of function ‘epoll_ctl’ [-Wimplicit-function-declaration] 333 | ret = epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_ADD, ev.data.fd, &ev); | ^~~~~~~~~ CANopenLinux/CO_driver.c:333:30: error: ‘CO_CANmodule_t’ has no member named ‘epoll_fd’ 333 | ret = epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_ADD, ev.data.fd, &ev); | ^~ CANopenLinux/CO_driver.c:333:42: error: ‘EPOLL_CTL_ADD’ undeclared (first use in this function) 333 | ret = epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_ADD, ev.data.fd, &ev); | ^~~~~~~~~~~~~ CANopenLinux/CO_driver.c:241:24: warning: unused variable ‘ev’ [-Wunused-variable] 241 | struct epoll_event ev = {0}; | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_disable’: CANopenLinux/CO_driver.c:356:30: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 356 | for (i = 0; i < CANmodule->CANinterfaceCount; i++) { | ^~ CANopenLinux/CO_driver.c:357:9: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 357 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[i]; | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:357:50: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 357 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[i]; | ^~ CANopenLinux/CO_driver.c:363:28: error: ‘CO_CANmodule_t’ has no member named ‘epoll_fd’ 363 | epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_DEL, interface->fd, NULL); | ^~ CANopenLinux/CO_driver.c:363:40: error: ‘EPOLL_CTL_DEL’ undeclared (first use in this function) 363 | epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_DEL, interface->fd, NULL); | ^~~~~~~~~~~~~ CANopenLinux/CO_driver.c:363:64: error: request for member ‘fd’ in something not a structure or union 363 | epoll_ctl(CANmodule->epoll_fd, EPOLL_CTL_DEL, interface->fd, NULL); | ^~ CANopenLinux/CO_driver.c:364:24: error: request for member ‘fd’ in something not a structure or union 364 | close(interface->fd); | ^~ CANopenLinux/CO_driver.c:365:18: error: request for member ‘fd’ in something not a structure or union 365 | interface->fd = -1; | ^~ CANopenLinux/CO_driver.c:367:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 367 | CANmodule->CANinterfaceCount = 0; | ^~ CANopenLinux/CO_driver.c:368:18: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 368 | if (CANmodule->CANinterfaces != NULL) { | ^~ CANopenLinux/CO_driver.c:369:23: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 369 | free(CANmodule->CANinterfaces); | ^~ CANopenLinux/CO_driver.c:371:14: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 371 | CANmodule->CANinterfaces = NULL; | ^~ CANopenLinux/CO_driver.c:373:18: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 373 | if (CANmodule->rxFilter != NULL) { | ^~ CANopenLinux/CO_driver.c:374:23: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 374 | free(CANmodule->rxFilter); | ^~ CANopenLinux/CO_driver.c:376:14: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 376 | CANmodule->rxFilter = NULL; | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANrxBufferInit’: CANopenLinux/CO_driver.c:397:15: error: ‘CO_CANrx_t’ has no member named ‘can_ifindex’ 397 | buffer->can_ifindex = 0; | ^~ CANopenLinux/CO_driver.c:398:15: error: ‘CO_CANrx_t’ has no member named ‘timestamp’ 398 | buffer->timestamp.tv_nsec = 0; | ^~ CANopenLinux/CO_driver.c:399:15: error: ‘CO_CANrx_t’ has no member named ‘timestamp’ 399 | buffer->timestamp.tv_sec = 0; | ^~ CANopenLinux/CO_driver.c:409:18: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 409 | CANmodule->rxFilter[index].can_id = buffer->ident; | ^~ CANopenLinux/CO_driver.c:410:18: error: ‘CO_CANmodule_t’ has no member named ‘rxFilter’ 410 | CANmodule->rxFilter[index].can_mask = buffer->mask; | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANtxBufferInit’: CANopenLinux/CO_driver.c:467:15: error: ‘CO_CANtx_t’ has no member named ‘can_ifindex’ 467 | buffer->can_ifindex = 0; | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANsend’: CANopenLinux/CO_driver.c:631:57: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 631 | if (CANmodule == NULL || buffer == NULL || CANmodule->CANinterfaceCount == 0) { | ^~ CANopenLinux/CO_driver.c:635:5: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 635 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[0]; | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:635:46: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaces’ 635 | CO_CANinterface_t* interface = &CANmodule->CANinterfaces[0]; | ^~ CANopenLinux/CO_driver.c:636:39: error: request for member ‘fd’ in something not a structure or union 636 | if (interface == NULL || interface->fd < 0) { | ^~ CANopenLinux/CO_driver.c:645:72: error: request for member ‘ifName’ in something not a structure or union 645 | log_printf(LOG_ERR, DBG_CAN_TX_FAILED, buffer->ident, interface->ifName); | ^~ CANopenLinux/CO_driver.c:650:31: error: request for member ‘fd’ in something not a structure or union 650 | ssize_t n = send(interface->fd, buffer, CAN_MTU, MSG_DONTWAIT); | ^~ CANopenLinux/CO_driver.c: In function ‘CO_CANmodule_process’: CANopenLinux/CO_driver.c:686:39: error: ‘CO_CANmodule_t’ has no member named ‘CANinterfaceCount’ 686 | if (CANmodule == NULL || CANmodule->CANinterfaceCount == 0) { | ^~ CANopenLinux/CO_driver.c: At top level: CANopenLinux/CO_driver.c:726:39: error: unknown type name ‘CO_CANinterface_t’; did you mean ‘CO_CANinterfaceState_t’? 726 | CO_CANread(CO_CANmodule_t* CANmodule, CO_CANinterface_t* interface, | ^~~~~~~~~~~~~~~~~ | CO_CANinterfaceState_t CANopenLinux/CO_driver.c:784:13: error: unknown type name ‘CO_CANrxMsg_t’; did you mean ‘CO_CANrx_t’? 784 | CO_CANrxMsg_t* buffer) /* If not NULL, msg will be copied to buffer */ | ^~~~~~~~~~~~~ | CO_CANrx_t CANopenLinux/CO_driver.c:824:70: error: unknown type name ‘CO_CANrxMsg_t’; did you mean ‘CO_CANrx_t’? 824 | xFromEpoll(CO_CANmodule_t* CANmodule, struct epoll_event* ev, CO_CANrxMsg_t* buffer, int32_t* msgIndex) {
10-26
your_type_t xxx; // 添加缺失成员 } CO_CANmodule_t; ``` --- ### 二、通用修复步骤 1. **添加头文件依赖** 在报错源文件开头添加： ```c #include #include #include "301/CO_driver.h" // CANopen...
OpenWrt-libtool: compile: aarch64-openwrt-linux-musl-gcc -DHAVE_CONFIG_H -I. -I./compat -I./include -I./include -I/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/staging_dir/target-aarch64-openwrt-linux-uclibc-be68_be77/usr/include -I/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/staging_dir/target-aarch64-openwrt-linux-uclibc-be68_be77/include -I/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/staging_dir/usr-be68_be77/include -I/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/../sdk/mtk798x/openwrt-21.02/staging_dir/toolchain-aarch64_cortex-a53_gcc-8.4.0_musl/include -fpic -MT bufferevent_openssl.lo -MD -MP -MF .deps/bufferevent_openssl.Tpo -c bufferevent_openssl.c -fPIC -DPIC -o .libs/bufferevent_openssl.o bufferevent_openssl.c: In function 'bio_bufferevent_new': bufferevent_openssl.c:106:3: error: dereferencing pointer to incomplete type 'BIO' {aka 'struct bio_st'} b->init = 0; ^~ bufferevent_openssl.c: At top level: bufferevent_openssl.c:228:1: error: variable 'methods_bufferevent' has initializer but incomplete type static BIO_METHOD methods_bufferevent = { ^~~~~~ bufferevent_openssl.c:79:27: warning: excess elements in struct initializer #define BIO_TYPE_LIBEVENT 57 ^~ bufferevent_openssl.c:229:2: note: in expansion of macro 'BIO_TYPE_LIBEVENT' BIO_TYPE_LIBEVENT, "bufferevent", ^~~~~~~~~~~~~~~~~ bufferevent_openssl.c:79:27: note: (near initialization for 'methods_bufferevent') #define BIO_TYPE_LIBEVENT 57 ^~ bufferevent_openssl.c:229:2: note: in expansion of macro 'BIO_TYPE_LIBEVENT' BIO_TYPE_LIBEVENT, "bufferevent", ^~~~~~~~~~~~~~~~~ bufferevent_openssl.c:229:21: warning: excess elements in struct initializer BIO_TYPE_LIBEVENT, "bufferevent", ^~~~~~~~~~~~~ bufferevent_openssl.c:229:21: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:230:2: warning: excess elements in struct initializer bio_bufferevent_write, ^~~~~~~~~~~~~~~~~~~~~ bufferevent_openssl.c:230:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:231:2: warning: excess elements in struct initializer bio_bufferevent_read, ^~~~~~~~~~~~~~~~~~~~ bufferevent_openssl.c:231:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:232:2: warning: excess elements in struct initializer bio_bufferevent_puts, ^~~~~~~~~~~~~~~~~~~~ bufferevent_openssl.c:232:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:233:2: warning: excess elements in struct initializer NULL /* bio_bufferevent_gets */, ^~~~ bufferevent_openssl.c:233:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:234:2: warning: excess elements in struct initializer bio_bufferevent_ctrl, ^~~~~~~~~~~~~~~~~~~~ bufferevent_openssl.c:234:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:235:2: warning: excess elements in struct initializer bio_bufferevent_new, ^~~~~~~~~~~~~~~~~~~ bufferevent_openssl.c:235:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:236:2: warning: excess elements in struct initializer bio_bufferevent_free, ^~~~~~~~~~~~~~~~~~~~ bufferevent_openssl.c:236:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:237:2: warning: excess elements in struct initializer NULL /* callback_ctrl */, ^~~~ bufferevent_openssl.c:237:2: note: (near initialization for 'methods_bufferevent') bufferevent_openssl.c:228:19: error: storage size of 'methods_bufferevent' isn't known static BIO_METHOD methods_bufferevent = { ^~~~~~~~~~~~~~~~~~~ Makefile:766: recipe for target 'bufferevent_openssl.lo' failed make[6]: *** [bufferevent_openssl.lo] Error 1 make[6]: Leaving directory '/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/build_dir/target-aarch64-openwrt-linux-uclibc-be68_be77/libevent-2.0.21-stable' Makefile:824: recipe for target 'all-recursive' failed make[5]: *** [all-recursive] Error 1 make[5]: Leaving directory '/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/build_dir/target-aarch64-openwrt-linux-uclibc-be68_be77/libevent-2.0.21-stable' Makefile:569: recipe for target 'all' failed make[4]: *** [all] Error 2 make[4]: Leaving directory '/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/build_dir/target-aarch64-openwrt-linux-uclibc-be68_be77/libevent-2.0.21-stable' Makefile:153: recipe for target '/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/build_dir/target-aarch64-openwrt-linux-uclibc-be68_be77/libevent-2.0.21-stable/.built' failed make[3]: *** [/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/build_dir/target-aarch64-openwrt-linux-uclibc-be68_be77/libevent-2.0.21-stable/.built] Error 2 make[3]: Leaving directory '/home/soho/code/be67/iplatform/board/model_mtk_mt798x/openwrt/package/libevent2' package/Makefile:13 openssl是1.1.1w，libevent2是2.0.19.怎么解决，给出详细处理方法
最新发布
11-06
> - 若是，则使用新的 `BIO_meth_new()` 和 `BIO_meth_set_xxx()` 函数动态创建 `BIO_METHOD` > - 否则沿用旧的静态初始化 > - 修复 `BIO_get_data` / `BIO_set_data` 宏缺失问题 然后确保 `Makefile` 中启用了 ...
comp.unix.aix faq -Part 3 of 5
q30的专栏
08-03 8940
Subject: 1.606: How to configure dialup SLIPIBMs WWW page http://www.ibm.com/> can lead you to a helpful documenthttp://www.austin.ibm.com/pub/www/services/aix_service/faxes/SLIP.DOC.zap>From: marvin
解决“storage size of ‘ctx‘ isn‘t known”问题
sanqima的专栏
08-05 2万+
在编译IPMITool时，有时会碰到"storage size of ‘ctx’ isn’t known"问题，出现该问题的原因是，openssl版本不同，其函数接口发生了变化，老接口EVP_CIPHER_CTX ctx;在新opensll版本上不能识别。需要改成心得语法格式，如下： //老接口 EVP_CIPHER_CTX ctx; ...
linux下编译工程提示：storage size of ‘tz’ isn't known
jianyuanjuesi的博客
04-18 3589
问题描述： 1、在编译工程时，报错： error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode for (U08 i = 0; i < len; i++) 即只有在C99或C11模式下，才能在for循环中初始化变量； 2、编译器给出的建议： note: use option -std=c99, ...
storage size of ‘...‘ isn’t known struct sockaddr_un
Spike99的博客
07-20 412
需要引入UNIX域套接字的头文件。
storage size of ‘oldact’ isn’t known
csallen的专栏
12-26 4755
#include int main() { struct sigaction act, oldact; return 0; } dies with the message testgcc4.c: In function ‘main’: testgcc4.c:6: error: storage size of ‘act’ isn’t known test
error: storage size of ‘threads’ isn’t known
Betterc5的博客
01-12 320
出错的代码行： pthread_t threads[NUM_THREADS]; 原因： NUM_THREADS 无值 原先： #define NUM_THREADS 修改为 #define NUM_THREADS 5
storage size of 'a' isn't known
夜
01-21 2248
使用union的时候发生的错误，解决很简单，仔细检查定义的结构名和使用的结构名是否是一样的，是否存在书写错误。
error storage size of 'pwbuf' isn't known
aaa550的专栏
07-19 677
//#ifdef HAVE_GRP_H   #include //#endif //#ifdef HAVE_PWD_H #include //#endif
storage size of xxx isnt known
12-09
"storage size of xxx isnt known" 这个错误通常出现在C语言编程中，特别是在使用结构体（struct）时。这个错误信息表明编译器无法确定某个变量或类型的存储大小。以下是一些可能的原因和解决方法： 1. **未定义的结构体**：如果使用了一个未定义的结构体，编译器将无法确定其大小。确保在使用结构体之前已经正确定义了它。 ```c struct MyStruct { int a; float b; }; struct MyStruct myVar; ``` 2. **前向声明**：如果使用前向声明的结构体，但未在定义之前使用其大小，编译器也会报错。确保在使用前向声明的结构体之前，已经正确定义了它。 ```c struct MyStruct; // 前向声明 struct MyStruct myVar; // 错误：未定义大小 struct MyStruct { int a; float b; }; ``` 3. **未包含头文件**：如果使用的类型定义在某个头文件中，但未包含该头文件，编译器将无法确定其大小。确保包含了所有必要的头文件。 ```c #include <stdio.h> int main() { printf("%zu\n", sizeof(int)); // 正确 return 0; } ``` 4. **不完整的类型**：如果使用了一个不完整的类型，编译器将无法确定其大小。确保类型是完整的。 ```c struct MyStruct; // 不完整的类型 struct MyStruct myVar; // 错误：未定义大小 struct MyStruct { int a; float b; }; ``` 通过检查以上几点，可以解决大多数“storage size of xxx isnt known”的错误。
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