In C++, when you archive object files into a .a file, does it matter the platform?
For example I'm on an x64 platform compiling with x64 compiler, I compile a bunch of CPP files into .o files. Using AR.exe, I archive them into a .a file and distribute that.
Will the .a file be x32, x64 or interchangeable? OR does it depend on the program using the .a file?
Presuming that "compiling with x64 compiler" means that it generates 64-bit code, whether or not it is a 64-bit executable itself, then your .a files will be 64-bit code. They are generated from your .o files, which are 64-bit binaries generated by your compiler. The .a couldn't be anything more or different than the .o files are which constitute it.