Initialized and declared ‘extern’的warning
WebbProblem:I received the following warning: 'REGISTER_NAMES' initialized and declared 'extern' [enabled by default] Solution:The GNU Compiler Collection (GCC)4.6.3 … Webb27 juni 2014 · The extern keyword means "declare without defining". In other words, it is a way to explicitly declare a variable, or to force a declaration without a definition. It is …
Initialized and declared ‘extern’的warning
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Webb9 maj 2011 · -Wall -Wextra emits no warning for static int i; extern int i; case. In fact, there is -Wredundant-decls, but it only works if there is no initialization in the extern … Webbextern int sizeArray = 10; You can't (the compiler is letting you as an extension, but with a warning) initialize a variable at the declaration, only at the definition (there should be a …
Webb12 juni 2009 · extern声明的全局变量的作用范围是整个工程，我们通常在“.h”文件中声明extern变量之后，在其他的“.c”或者“.cpp”中都可以使用。extern扩大了全局变量的作用 … Webb12 dec. 2024 · warning: 'extern' variable has an initializer [-Wextern-initializer] Basically my system ( Apple LLVM version 8.1.0 (clang-802.0.42)) does not like the explicit initialization with extern keyword. So, you should modify your code as per Ihdina's answer which compiles without error.
Webb另外，extern关键字只需要指明类型和变量名就行了，不能再重新赋值，初始化需要在原文件所在处进行，如果不进行初始化的话，全局变量会被编译器自动初始化为0。 像这种写法是不行的。 extern int num=4; 但是在声明之后就可以使用变量名进行修改了，像这样： #include int main () { extern int num; num=1; printf ("%d",num); return 0; } 如 … Webb最佳答案 一旦在 i 函数中定义了一个名为 main 的变量，文件范围内的 i 将被屏蔽并且无法访问 (除非您具有其地址)。 当您以后添加声明 extern int i 时，这与在相同作用域内的名为 i 的局部变量冲突，因为本地人无法进行外部链接。 它确实是 而不是 ，但可以访问全局 i 。 当您删除本地 i 时， extern int i 声明与文件范围内的定义匹配，因此没有错误。 至于 …
Webb15 nov. 2005 · An extern decleration means that a variable is declared and no memory is allocated for it. I've always tought extern means: the variable is declared 'somewhere else' but I want to use it in this file. Not: declared but no memory is allocated. If you try to extern an 'unallocated' variable the compiler
WebbInvestigate and fix any code that has extern variables that are initialized, by removing the initialization or by removing the extern storage class specifier. Problem: I received the following warning: type 'CMOA()::itcpc' with no linkage used to declare variable 'CMOA()::itcpc* itcpc_ptr' with linkage [enabled by default] family hotels seminyakWebb9 maj 2011 · Created attachment 22024 file "external.c", a short test case exhibiting the problem Given the attached source file, GCC (powerpc-eabi-gcc.exe (Sourcery G++ Lite 4.4-79) 4.4.1), invoked as: powerpc-eabi-gcc -te500v1 -mcall-sysv-noeabi -MMD -Wno-parentheses -c -o ex ternal.o external.c reports: external.c:3: warning: 'i' initialized … cook takeaway foodWebb10 dec. 2015 · 用GCC也是成功的，输出7；但会产生警告： warning: 'i' initialized and declared 'extern' 其实不加extern修饰，直接int i = 7，和加上external修饰 意思是一样 … cook tamales in air fryerWebbfile.c:1:12: warning: 'var' initialized and declared 'extern' 因为 extern 的存在通常意味着程序员打算写一个变量声明 (否则你为什么要使用 extern ？ )，但初始化器却把它变成 … family hotels sligoWebb17 dec. 2024 · 在a.c中进行全局变量的定义：1）exetrn int a = 5; 会跳出警告 ( a.c:3:12: warning: 'a' initialized and declared 'extern' [enabled by default] ),意思是你在头文件中进行了extern的声明，定义的时候已经默认使用extern的初始化和声明，即使用2）种方法进行定义 2）int a = 5; 在b.c文件中使用的时候 （extern int a;）可以不写，程序会在别的 … cook talk showWebb结果报 'print' initialized and declared 'extern' 警告，后来把引用和赋值分开写，Warning disappear extern int print; /*引用外部/全局变量*/ print = 2; 记：我是个追求完美的人， … family hotels sollerWebb2 feb. 2024 · 在以下程序中，我认为extern int i;会更改以下i，以参考i在main外部定义的i:. #include extern int i=1; // warning: 'i' initialized and declared 'extern' int main() { int i=2; printf("%d\n", i); extern int i; // error: extern declaration of 'i' follows declaration with no linkage printf("%d\n", i); return 0; } family hotels south coast england