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document configuration template system

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Daniel Micay 2022-01-12 08:38:33 -05:00
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@ -190,6 +190,15 @@ between portability, performance, memory usage or security. The core design
choices are not configurable and the allocator remains very security-focused choices are not configurable and the allocator remains very security-focused
even with all the optional features disabled. even with all the optional features disabled.
The configuration system supports a configuration template system with two
standard presets: the default configuration (`configs/default.mk`) and a light
configuration (`configs/light.mk`). Packagers are strongly encouraged to ship
both the standard `default` and `light` configuration. You can choose the
configuration to build using `make VARIANT=light` where `make VARIANT=default`
is the same as `make`. Non-default configuration templates will build a library
with the suffix `-variant` such as `libhardened_malloc-light.so` and will use
an `out-variant` directory instead of `out` for the build.
For reduced memory usage at the expense of performance (this will also reduce For reduced memory usage at the expense of performance (this will also reduce
the size of the empty slab caches and quarantines, saving a lot of memory, the size of the empty slab caches and quarantines, saving a lot of memory,
since those are currently based on the size of the largest size class): since those are currently based on the size of the largest size class):