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Ayke van Laethem
2de0635140
We use ThinLTO for linking, but we use it in a way that doesn't give most of its benefits: we merge all the bitcode files into a single LLVM module and run some optimizations on it before linking. Therefore, this works more like a traditional "full" LTO link rather than a true thin link. This commit adds a new experimental -lto=thin option to do a true ThinLTO link. The main benefit is that linking will be a lot faster, especially for large programs consisting of many packages. At the moment, it only works for programs that don't do interface type asserts and don't call interface methods. It also probably won't work on WebAssembly and baremetal systems. But it's part of a larger goal towards a truly incremental build system: https://github.com/tinygo-org/tinygo/issues/2870 Once interface type asserts and method calls are converted to a vtable-like implementation, most programs should just work on linux/darwin/windows.