在静态库中使用宏进行函数声明和定义对符号导出的影响

Question

Does anyone know if the extensive use of c-macros to define and declare functions when building a static library affects the linker's ability to export those symbols?

I have consistently run into this issue and almost always most of the symbol lookup failures went away when I switched to regular function declaration and definition (no usage of macros).

This happens on the mac platform using Xcode 5 and targeting iOS (arm + i386).

It did not matter which build settings i turned on/off. What seems to make a real difference is the usage of macros and the use of a symbol export file.

I ask because I am now up against a big, big chunk of code that uses several levels of macros for function definitions and declarations and I don't want to change that unless I absolutely have to.

The code is really complex (but compelling :) ) and was originally built using GNU make & siblings. So, switching it to XCode-based builds is no walk in the park. It plays tricks with header includes.

I would appreciate some education with respect to this point: macros & symbol exports for static libraries.

Thanks!

Answer 1

Macros are expanded before the compiler kicks in, and the linker doesn't show up until all the object files are finished. So, either your macros don't generate the code you think they do, or you have discovered the first macro to ever achieve time travel. Edit: or I completely missed the point, as can be.