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doc: clarify use of SIMD features

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You need a nightly compiler.

Ref #188
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Andrew Gallant 2018-08-23 09:55:31 -04:00
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commit 1bb8b7170f
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README.md
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@ -385,14 +385,15 @@ $ cargo build --release --features 'pcre2'
```
(Tip: use `--features 'pcre2 simd-accel avx-accel'` to also include compile
time SIMD optimizations.)
time SIMD optimizations, which will only work with a nightly compiler.)
Enabling the PCRE2 feature will attempt to automatically find and link with
your system's PCRE2 library via `pkg-config`. If one doesn't exist, then
ripgrep will build PCRE2 from source using your system's C compiler and then
statically link it into the final executable. Static linking can be forced even
when there is an available PCRE2 system library by either building ripgrep with
the MUSL target or by setting `PCRE2_SYS_STATIC=1`.
Enabling the PCRE2 feature works with a stable Rust compiler and will
attempt to automatically find and link with your system's PCRE2 library via
`pkg-config`. If one doesn't exist, then ripgrep will build PCRE2 from source
using your system's C compiler and then statically link it into the final
executable. Static linking can be forced even when there is an available PCRE2
system library by either building ripgrep with the MUSL target or by setting
`PCRE2_SYS_STATIC=1`.
ripgrep can be built with the MUSL target on Linux by first installing the MUSL
library on your system (consult your friendly neighborhood package manager).