[WIP] CMake: Enable IPO/LTO #597
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Interprocedural optimization (IPO) also known as link-time optimization (LTO) is a great feature to reduce binary size and to improve code performance, e.g. through extended inlining. This feature is specifically useful for modern C++ code, which is also the reason pybind11 enables it automatically for our python bindings as soon as it is detected. We now expose this feature for the rest of the library build as well and auto-enable it when supported by the compiler. Binary size before: ``` $ du -hs lib/* 1.0M lib/libCatchMain.so 1.0M lib/libCatchRunner.so 1.3M lib/libopenPMD.ADIOS1.Parallel.so 1.1M lib/libopenPMD.ADIOS1.Serial.so 2.2M lib/libopenPMD.so 968K lib/python3.6 ``` and with IPO/LTO enabled (new default): ``` $ du -hs lib/* 876K lib/libCatchMain.so 876K lib/libCatchRunner.so 1.2M lib/libopenPMD.ADIOS1.Parallel.so 1.1M lib/libopenPMD.ADIOS1.Serial.so 1.5M lib/libopenPMD.so 968K lib/python3.6 ```
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Interprocedural optimization (IPO) also known as link-time optimization (LTO) is a great feature to reduce binary size and to improve code performance, e.g. through extended inlining.
This feature is specifically useful for modern C++ code, which is also the reason pybind11 enables it automatically for our python bindings as soon as it is detected.
We now expose this feature for the rest of the library build as well and auto-enable it when supported by the compiler.
Binary size before:
and with IPO/LTO enabled (new default):