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Link Time Optimization (LTO) gives GCC the capability of dumping its internal representation (GIMPLE) to disk, so that all the different compilation units that make up a single executable can be optimized as a single module. This expands the scope of inter-procedural optimizations to encompass the whole program (or, rather, everything that is visible at link time).
| • LTO Overview: | Overview of LTO. | |
| • LTO object file layout: | LTO file sections in ELF. | |
| • IPA: | Using summary information in IPA passes. | |
| • WHOPR: | Whole program assumptions, linker plugin and symbol visibilities. | |
| • Internal flags: | Internal flags controlling lto1.
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