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User visible changes in `mruby3`
===
# Build System
You can specify `TARGET` option to `rake` via a command line
option, or via an environment variable, e.g.
`rake TARGET=host all`
or
`TARGET=host rake all`
It's much easier to switch multiple targets than the
previous `build_config.rb` system.
## `presym` target
The first compilation of `mruby` may require generation of a
static symbol table named `build/presym`. You can generate
the table by `rake gensym`.
## `target` directory
Build target specification files are loaded from `target`
directory. The default `TARGET` is `host` which is described
in `target/host.rb`. There are many other targets for example:
* `host-gprof`: compiles with `gprof` for performance tuning
* `host-m32`: compiles in gcc 32bit mode on 64bit platforms
* `boxing`: compiles all three boxing options
* `clang-asan`: compiles with `clang`'s Address Sanitizer
`target/host.rb` comes with comments to help writing a new
target description.
If you want to have your target description out of the
source tree, you can specify the path to the description
file in `MRUBY_CONFIG`.
# Build Target Contribution
When you write a new target description, please
contribute. We welcome your contribution as a GitHub
pull-request.
# Languge Changes
## New Syntax
We have ported some new syntax from CRuby.
* R-assignment (`12 => x`)
* Numbered block parameter (`x.map{_1 * 2}`)
* End-less `def` (`def double(x) = x*2`)
# Configuration Options Changed
Some configuration macro names are changed for consistency
## `MRB_NO_FLOAT`
Changed from `MRB_WITHOUT_FLOAT` to conform `USE_XXX` naming
convention.
## `MRB_USE_FLOAT32`
Changed from `MRB_USE_FLOAT` to make sure `float` here means
using single precision float, and not the opposite of
`MRB_NO_FLOAT`.
## `MRB_USE_METHOD_T_STRUCT`
Changed from `MRB_METHOD_T_STRUCT`.
To use `struct` version of `mrb_method_t`. More portable but consumes more memory.
Turned on by default on 32bit platforms.
## `MRB_NO_BOXING`
Uses `struct` to represent `mrb_value`. Consumes more memory
but easier to inveticate the internal and to debug. It used
to be default `mrb_value` representation. Now the default is
`MRB_WORD_BOXING`.
## `MRB_WORD_BOXING`
Pack `mrb_value` in an `intptr_t` integer. Consumes less
memory compared to `MRB_NO_BOXING` especially on 32 bit
platforms. `Fixnum` size is 31 bits so some integer values
does not fit in `Fixnum` integers.
## `MRB_NAN_BOXING`
Pack `mrb_value` in a floating pointer number. Nothing
changed from previous versions.
## `MRB_USE_MALLOC_TRIM`
Call `malloc_trim(0)` from mrb_full_gc() if this macro is defined.
If you are using glibc malloc, this macro could reduce memory consumption.
# Internal Changes
## `Random` now use `xoshiro128++`.
For better and faster random number generation.
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