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documentation: document lto build flags

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Signed-off-by: Matthias Reichl <hias@horus.com>
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Matthias Reichl 2018-05-31 12:29:28 +02:00
parent de230e9638
commit dfb65402fa
1 changed files with 4 additions and 1 deletions
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packages/readme.md
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@ -118,7 +118,10 @@ Set the variable `PKG_BUILD_FLAGS` in the `package.mk` to enable/disable the sin
|----------|----------|----------------|-------------|
| pic | disabled | target/init | [Position Independent Code](https://en.wikipedia.org/wiki/Position-independent_code) |
| pic:host | disabled | host/bootstrap | see above |
| lto | depend on `LTO_SUPPORT` | target/init | can only disabled, use of "Link Time Optimisation" of the compiler |
| lto | disabled | target/init | enable LTO (Link Time optimization) in the compiler and linker unless disabled via `LTO_SUPPORT`. Compiles non-fat LTO objects (only bytecode) and performs single-threaded optimization at link stage |
| lto-parallel | disabled | target/init | same as `lto` but enable parallel optimization at link stage. Only enable this if the package build doesn't run multiple linkers in parallel otherwise this can result in lots of parallel processes! |
| lto-fat | disabled | target/init | same as `lto` but compile fat LTO objects (bytecode plus optimized assembly). This increases compile time but can be useful to create static libraries suitable both for LTO and non-LTO linking |
| lto-off | disabled | target/init | explicitly disable LTO in the compiler and linker |
| gold | depend on `GOLD_SUPPORT` | target/init | can only disabled, use of the GOLD-Linker |
| parallel | enabled | all | `make` or `ninja` builds with multiple threads/processes (or not) |