When interprocedural analysis is set to optimize at the file level, the compiler reads and analyzes an entire file before generating instructions and data.
At this level, the compiler generates more efficient code for inline function calls and C++ exception handling than when interprocedural analysis is off. The compiler is also able to increase character string reuse and pooling, reducing the size of object code. This is equivalent to the " deferred inlining" and "deferred codegen" options of older compilers.
The compiler also safely removes static functions and variables that are not referred to within the file, which reduces the amount of object code that the linker must process, resulting in better linker performance.