warning: implicit declaration of function ‘typeof’

本文介绍了解决GCC编译过程中出现的关于asm/inline/typeof的警告问题,提供了两种解决方案:一是修改源代码中的关键字为__asm__/__inline__/__typeof__;二是调整gcc编译参数,移除std=c99选项。

asm/inline/typeof使用GCC进行编译时提示如下告警:

warning: implicit declaration of function ‘typeof’

错误提示缺少')';


修改方法:

__asm__/__inline__/__typeof__

就可以解决该问题;


或者在gcc的编译参数中去掉std=c99编译选项;

编译错误 src/cliLanDnsHandlers.c:67:5: error: unknown type name ‘dlist_t’ dlist_t list; // 链表节点 ^~~~~~~ src/cliLanDnsHandlers.c:76:8: error: unknown type name ‘dlist_t’ static dlist_t g_landns_list = DLIST_HEAD_INIT(g_landns_list); // 全局链表头 ^~~~~~~ src/cliLanDnsHandlers.c:76:32: error: implicit declaration of function ‘DLIST_HEAD_INIT’ [-Werror=implicit-function-declaration] static dlist_t g_landns_list = DLIST_HEAD_INIT(g_landns_list); // 全局链表头 ^~~~~~~~~~~~~~~ src/cliLanDnsHandlers.c:76:32: error: initializer element is not constant src/cliLanDnsHandlers.c: In function ‘find_landns_node’: src/cliLanDnsHandlers.c:101:5: error: implicit declaration of function ‘dlist_for_each_entry’; did you mean ‘dlist_foreach_safe’? [-Werror=implicit-function-declaration] dlist_for_each_entry(node, &g_landns_list, list) { ^~~~~~~~~~~~~~~~~~~~ dlist_foreach_safe src/cliLanDnsHandlers.c:101:48: error: ‘list’ undeclared (first use in this function); did you mean ‘DList’? dlist_for_each_entry(node, &g_landns_list, list) { ^~~~ DList src/cliLanDnsHandlers.c:101:48: note: each undeclared identifier is reported only once for each function it appears in src/cliLanDnsHandlers.c:101:54: error: expected ‘;’ before ‘{’ token dlist_for_each_entry(node, &g_landns_list, list) { ^ src/cliLanDnsHandlers.c:107:1: error: no return statement in function returning non-void [-Werror=return-type] } ^ src/cliLanDnsHandlers.c: In function ‘create_new_node’: src/cliLanDnsHandlers.c:123:5: error: implicit declaration of function ‘dlist_add_tail’; did you mean ‘dlistTail’? [-Werror=implicit-function-declaration] dlist_add_tail(&new_node->list, &g_landns_list); ^~~~~~~~~~~~~~ dlistTail src/cliLanDnsHandlers.c: In function ‘cli_lanDnsAddProfile’: src/cliLanDnsHandlers.c:133:10: error: ‘g_in_landns_mode’ undeclared (first use in this function); did you mean ‘find_landns_node’? if (!g_in_landns_mode) { ^~~~~~~~~~~~~~~~ find_landns_node src/cliLanDnsHandlers.c:155:18: error: implicit declaration of function ‘dmDnsServerRuleGetByName’; did you mean ‘dmDnsServerRuleDelById’? [-Werror=implicit-function-declaration] int db_ret = dmDnsServerRuleGetByName(profileName, &db_rule); ^~~~~~~~~~~~~~~~~~~~~~~~ dmDnsServerRuleDelById src/cliLanDnsHandlers.c:168:9: error: implicit declaration of function ‘INIT_DLIST_HEAD’; did you mean ‘UNIT_LIST_HAS’? [-Werror=implicit-function-declaration] INIT_DLIST_HEAD(&node->list); ^~~~~~~~~~~~~~~ UNIT_LIST_HAS src/cliLanDnsHandlers.c: In function ‘cli_lanDnsDeleteAttribute’: src/cliLanDnsHandlers.c:353:36: error: ‘CFG_DNSSERVER_RULE_T {aka struct <anonymous>}’ has no member named ‘alias_domains’ memset(g_current_edit->rule.alias_domains, 0, sizeof(g_current_edit->rule.alias_domains)); ^ src/cliLanDnsHandlers.c:353:82: error: ‘CFG_DNSSERVER_RULE_T {aka struct <anonymous>}’ has no member named ‘alias_domains’ memset(g_current_edit->rule.alias_domains, 0, sizeof(g_current_edit->rule.alias_domains)); ^ src/cliLanDnsHandlers.c: In function ‘cli_lanDnsShow’: src/cliLanDnsHandlers.c:531:20: error: ‘CFG_DNSSERVER_RULE_T {aka struct <anonymous>}’ has no member named ‘alias_domains’ if (strlen(rule->alias_domains) > 0) { ^~ src/cliLanDnsHandlers.c:532:49: error: ‘CFG_DNSSERVER_RULE_T {aka struct <anonymous>}’ has no member named ‘alias_domains’ cliPrintf(pCliEnv, "Aliases: %s\n", rule->alias_domains); ^~ src/cliLanDnsHandlers.c: In function ‘is_valid_network_list’: src/cliLanDnsHandlers.c:589:43: error: implicit declaration of function ‘is_cidr_format’ [-Werror=implicit-function-declaration] if (strcmp(token, "all") != 0 && !is_cidr_format(token)) { ^~~~~~~~~~~~~~ src/cliLanDnsHandlers.c: At top level: src/cliLanDnsHandlers.c:601:6: error: conflicting types for ‘is_cidr_format’ bool is_cidr_format(const char *cidr) { ^~~~~~~~~~~~~~ src/cliLanDnsHandlers.c:589:43: note: previous implicit declaration of ‘is_cidr_format’ was here if (strcmp(token, "all") != 0 && !is_cidr_format(token)) { ^~~~~~~~~~~~~~ src/cliLanDnsHandlers.c: In function ‘cli_lanDns_init’: src/cliLanDnsHandlers.c:619:5: error: implicit declaration of function ‘cli_register_command_set’; did you mean ‘cli_enter_lanDns’? [-Werror=implicit-function-declaration] cli_register_command_set("landns", lanDnsCmdTree, "LAN DNS Configuration"); ^~~~~~~~~~~~~~~~~~~~~~~~ cli_enter_lanDns src/cliLanDnsHandlers.c:619:40: error: ‘lanDnsCmdTree’ undeclared (first use in this function); did you mean ‘lanDns_node’? cli_register_command_set("landns", lanDnsCmdTree, "LAN DNS Configuration"); ^~~~~~~~~~~~~ lanDns_node src/cliLanDnsHandlers.c:620:5: error: ‘g_in_landns_mode’ undeclared (first use in this function); did you mean ‘find_landns_node’? g_in_landns_mode = false; ^~~~~~~~~~~~~~~~ find_landns_node src/cliLanDnsHandlers.c:622:5: error: implicit declaration of function ‘DLIST_INIT’; did you mean ‘DLIST_ITER’? [-Werror=implicit-function-declaration] DLIST_INIT(&g_landns_list); // 确保链表头正确初始化 ^~~~~~~~~~ DLIST_ITER src/cliLanDnsHandlers.c: In function ‘cli_enter_lanDns’: src/cliLanDnsHandlers.c:643:56: error: implicit declaration of function ‘dlist_count’; did you mean ‘dlistSort’? [-Werror=implicit-function-declaration] cliPrintf(pCliEnv, "%% Loaded %d DNS rules\n", dlist_count(&g_landns_list)); ^~~~~~~~~~~ dlistSort src/cliLanDnsHandlers.c:649:5: error: ‘g_in_landns_mode’ undeclared (first use in this function); did you mean ‘find_landns_node’? g_in_landns_mode = true; ^~~~~~~~~~~~~~~~ find_landns_node src/cliLanDnsHandlers.c: In function ‘cli_exit_lanDns’: src/cliLanDnsHandlers.c:657:5: error: implicit declaration of function ‘dlist_for_each_entry_safe’; did you mean ‘dlist_foreach_safe’? [-Werror=implicit-function-declaration] dlist_for_each_entry_safe(node, tmp, &g_landns_list, list) { ^~~~~~~~~~~~~~~~~~~~~~~~~ dlist_foreach_safe src/cliLanDnsHandlers.c:657:58: error: ‘list’ undeclared (first use in this function); did you mean ‘DList’? dlist_for_each_entry_safe(node, tmp, &g_landns_list, list) { ^~~~ DList src/cliLanDnsHandlers.c:657:64: error: expected ‘;’ before ‘{’ token dlist_for_each_entry_safe(node, tmp, &g_landns_list, list) { ^
10-20
`warning: implicit declaration of function 'GreenPixel'` 警告表明编译器在使用 `GreenPixel` 函数之前没有找到该函数的声明。要解决这个问题,需要确保包含了定义 `GreenPixel` 函数的头文件。 `GreenPixel` 函数是 Xlib 库的一部分,在 `X11/Xlib.h` 头文件中声明。在你的代码中已经包含了这个头文件,通常情况下应该不会出现这个警告。不过,为了确保正确使用,需要检查以下几点: 1. 确认头文件包含无误,并且没有拼写错误。 2. 确保使用的 Xlib 库版本支持 `GreenPixel` 函数。 以下是修改后的代码示例,确保头文件包含无误: ```c #include <X11/Xlib.h> #include <X11/Xutil.h> #include <stdio.h> #include <stdlib.h> #define WIDTH 400 #define HEIGHT 300 int main() { // 打开 X 服务器连接 Display *display = XOpenDisplay(NULL); if (display == NULL) { fprintf(stderr, "无法打开 X 服务器连接\n"); return 1; } // 获取默认屏幕 int screen = DefaultScreen(display); // 创建窗口 Window window = XCreateSimpleWindow(display, RootWindow(display, screen), 0, 0, WIDTH, HEIGHT, 0, BlackPixel(display, screen), WhitePixel(display, screen)); // 选择窗口事件 XSelectInput(display, window, ExposureMask | KeyPressMask); // 映射窗口到屏幕 XMapWindow(display, window); // 创建图形上下文 GC gc = XCreateGC(display, window, 0, NULL); // 设置绘图颜色为绿色 XSetForeground(display, gc, GreenPixel(display, screen)); // 事件循环 XEvent event; while (1) { XNextEvent(display, &event); switch (event.type) { case Expose: // 绘制矩形 XFillRectangle(display, window, gc, 0, 0, WIDTH, HEIGHT); XFlush(display); break; case KeyPress: // 按下任意键退出 XCloseDisplay(display); return 0; } } return 0; } ``` 编译该程序的命令如下: ```sh gcc -o draw_rectangle draw_rectangle.c -lX11 ```
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