tinygo/CHANGELOG.md

0.6.0
---
* **command line**
  - some portability improvements
  - make `$GOROOT` more robust and configurable
  - check for Clang at the Homebrew install location as fallback
* **compiler driver**
  - support multiple variations of LLVM commands, for non-Debian distributions
* **compiler**
  - improve code quality in multiple ways
  - make panic configurable, adding trap on panic
  - refactor many internal parts of the compiler
  - print all errors encountered during compilation
  - implement calling function values of a named type
  - implement returning values from blocking functions
  - allow larger-than-int values to be sent across a channel
  - implement complex arithmetic
  - improve hashmap support
  - add debuginfo for function arguments
  - insert nil checks on stores (increasing code size)
  - implement volatile operations as compiler builtins
  - add `//go:inline` pragma
  - add build tags for the Go stdlib version
* **cgo**
  - implement `char`, `enum` and `void*` types
  - support `#include` for builtin headers
  - improve typedef/struct/enum support
  - only include symbols that are necessary, for broader support
  - mark external function args as `nocapture`
  - implement support for some `#define` constants
  - implement support for multiple CGo files in a single package
- **standard library**
  - `machine`: remove microbit matrix (moved to drivers repository)
  - `machine`: refactor pins to use `Pin` type instead of `GPIO`
  - `runtime`: print more interface types on panic, including `error`
* **targets**
  - `arm`: print an error on HardFault (including stack overflows)
  - `atsamd21`: fix a bug in the ADC peripheral
  - `atsamd21`: add support for I2S
  - `feather-m0`: add support for this board
  - `nrf51`: fix a bug in I2C
  - `stm32f103xx`: fix a bug in I2C
  - `syscall`: implement `Exit` on unix
  - `trinket-m0`: add support for this board
  - `wasm`: make _main_ example smaller
  - `wasm`: don't cache wasm file in the server, for ease of debugging
  - `wasm`: work around bug #41508 that caused a deadlock while linking
  - `wasm`: add support for `js.FuncOf`

0.5.0
---
- **compiler driver**
  - use `wasm-ld` instead of `wasm-ld-8` on macOS
  - drop dependency on `llvm-ar`
  - fix linker script includes when running outside `TINYGOROOT`
- **compiler**
  - switch to LLVM 8
  - add support for the Go 1.12 standard library (Go 1.11 is still supported)
  - work around lack of escape analysis due to nil checks
  - implement casting named structs and pointers to them
  - fix int casting to use the source signedness
  - fix some bugs around `make([]T, …)` with uncommon index types
  - some other optimizations
  - support interface asserts in interp for "math/rand" support
  - resolve all func value targets at compile time (wasm-only at the moment)
- **cgo**
  - improve diagnostics
  - implement C `struct`, `union`, and arrays
  - fix CGo-related crash in libclang
  - implement `C.struct_` types
- **targets**
  - all baremetal: pretend to be linux/arm instead of js/wasm
  - `avr`: improve `uintptr` support
  - `cortexm`: implement memmove intrinsic generated by LLVM
  - `cortexm`: use the lld linker instead of `arm-none-eabi-ld`
  - `darwin`: use custom syscall package that links to libSystem.dylib
  - `microbit`: add blink example
  - `samd21`: support I2C1
  - `samd21`: machine/atsamd21: correct pad/pin handling when using both UART
     and USBCDC interfaces at same time
  - `stm32f4discovery`: add support for this board
  - `wasm`: support async func values
  - `wasm`: improve documentation and add extra example

0.4.1
---
- **compiler**
  - fix `objcopy` replacement to include the .data section in the firmware image
  - use `llvm-ar-7` on Linux to fix the Docker image

0.4.0
---
- **compiler**
  - switch to the hardfloat ABI on ARM, which is more widely used
  - avoid a dependency on `objcopy` (`arm-none-eabi-objcopy` etc.)
  - fix a bug in `make([]T, n)` where `n` is 64-bits on a 32-bit platform
  - adapt to a change in the AVR backend in LLVM 8
  - directly support the .uf2 firmware format as used on Adafruit boards
  - fix a bug when calling `panic()` at init time outside of the main package
  - implement nil checks, which results in a ~5% increase in code size
  - inline slice bounds checking, which results in a ~1% decrease in code size
- **targets**
  - `samd21`: fix a bug in port B pins
  - `samd21`: implement SPI peripheral
  - `samd21`: implement ADC peripheral
  - `stm32`: fix a bug in timekeeping
  - `wasm`: fix a bug in `wasm_exec.js` that caused corruption in linear memory
     when running on Node.js.

0.3.0
---
- **compiler**
  - remove old `-initinterp` flag
  - add support for macOS
- **cgo**
  - add support for bool/float/complex types
- **standard library**
  - `device/arm`: add support to disable/enable hardware interrupts
  - `machine`: add CPU frequency for nrf-based boards
  - `syscall`: add support for darwin/amd64
- **targets**
  - `circuitplay_express`: add support for this board
  - `microbit`: add regular pin constants
  - `samd21`: fix time function for goroutine support
  - `samd21`: add support for USB-CDC (serial over USB)
  - `samd21`: add support for pins in port B
  - `samd21`: add support for pullup and pulldown pins
  - `wasm`: add support for Safari in example


0.2.0
---
- **command line**
  - add version subcommand
- **compiler**
  - fix a bug in floating point comparisons with NaN values
  - fix a bug when calling `panic` in package initialization code
  - add support for comparing `complex64` and `complex128`
- **cgo**
  - add support for external globals
  - add support for pointers and function pointers
- **standard library**
  - `fmt`: initial support, `fmt.Println` works
  - `math`: support for most/all functions
  - `os`: initial support (only stdin/stdout/stderr)
  - `reflect`: initial support
  - `syscall`: add support for amd64, arm, and arm64