我怎么能执行C / C ++ pre-主要初始化与AVR-GCC? [英] How can I perform pre-main initialization in C/C++ with avr-gcc?

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问题描述

为了确保一些初始化code之前运行(使用的Arduino / AVR-GCC)我有code,如以下内容:

In order to ensure that some initialization code runs before main (using Arduino/avr-gcc) I have code such as the following:

class Init {
public:
    Init() { initialize(); }
};

Init init;

在理想情况下,我想能够简单地写:

Ideally I'd like to be able to simply write:

initialize();

但是,这并不编译...

but this doesn't compile...

有没有一种更简洁的方式来达到同样的效果?

Is there a less verbose way to achieve the same effect?

注意:的code是一个Arduino草图的一部分,所以在功能是自动生成的,不能被修改(例如调用初始化之前的任何其他code)。

Note: the code is part of an Arduino sketch so the main function is automatically generated and cannot be modified (for example to call initialize before any other code).

更新:理想初始化将在设置执行的功能,但在这种情况下,有其他的code取决于它这发生之前

Update: ideally the initialization would be performed in the setup function, but in this case there is other code depending on it which occurs before main.

推荐答案

您可以使用GCC的<一个href=\"http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#index-g%5Ft%5F0040$c$c%5F007bconstructor%5F007d-function-attribute-2220\"><$c$c>constructor属性,以确保它得到前所谓的main()

You can use GCC's constructor attribute to ensure that it gets called before main():

void Init(void) __attribute__((constructor));
void Init(void) { /* code */ }  // This will always run before main()

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