Question

Can you add more than one attribute to an identifier in C with gcc? Here is what I have now. I left out the include statements because they get scramble in the post. If there is a way to add two, what is the general syntax, and how can I do it both with the defintion, and with a prototype? Thank you. :-)

main() {  
    printf("In Main
");  
}  
__attribute__ ((constructor)) void beforeMain(void)  
{  
    printf("Before Main
");  
}

Answer 1

在C中,与海合会有两种不同的特性:

#include <stdio.h>

// Attributes in prototypes:
__attribute__((constructor, weak)) void beforeMain(void);
__attribute__((constructor)) __attribute__((weak)) void beforeMain2(void);

int main(){
    printf("In Main
");
    return 0;
}

// Attributes in definitions:
__attribute__((constructor, weak)) void beforeMain(void){
    printf("Before Main 1
");
}

__attribute__((constructor)) __attribute__((weak)) void beforeMain2(void){
    printf("Before Main 2
");
}

上述法典在4.4.3版下对我进行正确编辑和操作。

Answer 2

你们可以使用多种——按空间分列的光谱仪。

char s[3] __attribute__((aligned(32))) __attribute__((weak));

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