Flags and Implementation
The Intel C/C++ compilers allow whole-program IPO. The flag to enable interprocedural optimizations for a single file is -ip, the flag to enable interprocedural optimization across all files in the program is -ipo.
The GNU GCC compiler has function inlining, which is turned on by default at -O3, and can be turned on manually via passing the switch (-finline-functions) at compile time. GCC version 4.1 has a new infrastructure for inter-procedural optimization.
Also Gcc has options for IPO: -fwhole-program --combine.
The Microsoft C Compiler, integrated into Visual Studio, also supports interprocedural optimization.
The Clang supports IPO at optimization level -O4.
Read more about this topic: Interprocedural Optimization
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