Regexes are precompiled to binary values during code compilation.
These binary values may be incompatible between different PCRE versions
and OS endianness. This makes code less portable to achieve slight
performance improvement.
PCRE version and endianness are parts of Regex structure and may be
checked in runtime.
This commit adds this check and makes regex execution fall back
to binary matching if versions are incompatible.
This slightly reduces performance (around 5% for simple regexes) for
compatible versions because there is an additional version read.
Also for incompatible versions it's as fast as binary matching.
rebar expects its dependencies to have a file at `src/elixir.app.src`.
This is a work around a rebar limitation since it should support a way
to have an umbrella application, as OTP.
José Valim
Daniil Fedotov
Lau Taarnskov
Michał Muskała