document configuration template system
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@ -190,6 +190,15 @@ between portability, performance, memory usage or security. The core design
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choices are not configurable and the allocator remains very security-focused
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even with all the optional features disabled.
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The configuration system supports a configuration template system with two
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standard presets: the default configuration (`configs/default.mk`) and a light
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configuration (`configs/light.mk`). Packagers are strongly encouraged to ship
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both the standard `default` and `light` configuration. You can choose the
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configuration to build using `make VARIANT=light` where `make VARIANT=default`
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is the same as `make`. Non-default configuration templates will build a library
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with the suffix `-variant` such as `libhardened_malloc-light.so` and will use
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an `out-variant` directory instead of `out` for the build.
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For reduced memory usage at the expense of performance (this will also reduce
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the size of the empty slab caches and quarantines, saving a lot of memory,
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since those are currently based on the size of the largest size class):
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