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[docs] Adopt CONFIG.md with meson

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Ebrahim Byagowi 2020-08-02 11:22:09 +04:30 committed by GitHub
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CONFIG.md
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@ -1,9 +1,9 @@
# Configuring HarfBuzz
Most of the time you will not need any custom configuration. The configuration
options provided by `configure` or `meson` should be enough. In particular,
if you just want HarfBuzz library plus hb-shape / hb-view utilities, make sure
FreeType and Cairo are available and found during configuration.
options provided by `meson` should be enough. In particular, if you just want
HarfBuzz library plus hb-shape / hb-view utilities, make sure FreeType and Cairo
are available and found during configuration.
If you are building for distribution, you should more carefully consider whether
you need Glib, ICU, Graphite2, as well as CoreText / Uniscribe / DWrite. Make
@ -18,9 +18,9 @@ binary size savings.
## Compiler Options
Make sure you build with your compiler's "optimize for size" option. On `gcc`
this is `-Os`, and can be enabled by passing `CXXFLAGS=-Os` either to `configure`
(sticky) or to `make` (non-sticky). On clang there is an even more extreme flag,
`-Oz`.
this is `-Os`, and can be enabled by passing `CXXFLAGS=-Os`. On clang there
is an even more extreme flag, `-Oz`. Meson also provides `--buildtype=minsize`
for more convenience.
HarfBuzz heavily uses inline functions and the optimize-size flag can make the
library smaller by 20% or more. Moreover, sometimes, based on the target CPU,
@ -32,8 +32,7 @@ optimizations. Search for `HB_OPTIMIZE_SIZE` for details, if you are using
other compilers, or continue reading.
Another compiler option to consider is "link-time optimization", also known as
'lto'. To enable that, with `gcc` or `clang`, add `-flto` to both `CXXFLAGS`
and `LDFLAGS`, either on `configure` invocation (sticky) or on `make` (non-sticky).
'lto'. To enable that, feel free to use `-Db_lto=true` of meson.
This, also, can have a huge impact on the final size, 20% or more.
Finally, if you are making a static library build or otherwise linking the