gnu ld是链接在整个目标文件中还是仅链接所需的功能?
我们有一个库和一个可执行文件，该文件将被静态链接到库.我们希望最小化最终可执行文件的程序空间.
We have a library and an executable, that is to be statically linked to the lib. We want to minimize the program space of the final executable.
根据avr-libc的文档:
According to avr-libc's documentation:
另一方面，我的同事们一致认为，链接器会丢弃一些未使用的功能.
On the other hand, my colleagues are unanimous on the point that at some pass, the linker throws away any unused functions.
那么谁是正确的，或者我误会了什么?在整个gcc中答案是一致的吗?还是我们在这里只说avr端口?
So who is correct or am I misunderstanding something? Is the answer consistent throughout gcc or are we talking only the avr port here?
除非您告知，否则它不会执行无效代码剥离.为此，您需要使用以下命令编译所有内容:
It doesn't perform dead code stripping unless you tell it to. In order to do that, you need to compile everything with:
-fdata-sections -ffunction-sections以标记所有数据和功能.与GCC链接时，您需要通过:
in order to mark all data and functions. And when linking with GCC you need to pass:
-Wl,--gc-sections以便对所有未使用的部分进行垃圾收集.
in order to garbage-collect all unused sections.