Arduino setup

[kevinresol]

Describe the problem. What did you see? What did you expect to see?

First of all, Arduino expects two "main" functions void setup() and void loop().
From what I learned from other resources, when compiling manually (instead of compiling with the Arduino IDE), one has to include the Arduino.h header. I did so in Kit with include "Arduino.h"; and used #[extern] to keep the function name. However kit complains setup and loop is re-declared because it is already declared in Arduino.h.

Anyway, I commented out the #[extern] just to see if I can use the avr gcc to compile the code. But then I get this output https://pastebin.com/Jp1VRYLE

If this is a code issue, provide a minimal code example:

./build.sh:

#!/bin/bash

kitc \
  --cc /Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/gcc-avr \
  --lib \
  -s src \
  -I /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino \
  -I /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/variants/standard \
  -c -MMD \
  -c -c \
  -c -D__PROG_TYPES_COMPAT__ \
  -c -mmcu=atmega328p \
  -c -DF_CPU=16000000L \
  -c -DARDUINO=185 \
  -c -DARDUINO_ARCH_AVR\
  -c -Wall \
  -c -ffunction-sections \
  -c -fdata-sections \
  -c -Os \
  -c -std=gnu11 \
  -c -flto \
  -c -fno-fat-lto-objects \
  -c -fdiagnostics-color=always \
  -v \
  hello.kit

./src/hello.kit:

include "Arduino.h";

// #[extern]
function setup() {
    printf("%s\n", "Hello from Kit!");
}

// #[extern]
function loop() {
    printf("%s\n", "Hello from Kit!");
}

Environment

[2019-01-17 00:23:42.1359] ===> kitc version
[2019-01-17 00:23:42.1371] DBG: 0.1.0
[2019-01-17 00:23:42.1375] ===> OS
[2019-01-17 00:23:42.1378] DBG: darwin
[2019-01-17 00:23:42.1382] ===> Compiler
[2019-01-17 00:23:42.1386] DBG: /Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/gcc-avr
gcc-avr (GCC) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[2019-01-17 00:23:42.1421] ===> Include paths
[2019-01-17 00:23:42.1427] DBG: ["/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/../lib/gcc/avr/4.9.2/../../../../avr/include","/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/../lib/gcc/avr/4.9.2/include-fixed","/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/../lib/gcc/avr/4.9.2/include"]
[2019-01-17 00:23:42.1448] ===> Compiler flags
[2019-01-17 00:23:42.1452] DBG: ["-D_GNU_SOURCE","-D_BSD_SOURCE","-D_DEFAULT_SOURCE","-std=c99","-pedantic","-O3","-Os","-U__BLOCKS__","-Wno-expansion-to-defined","-Wno-gnu-zero-variadic-macro-arguments","-Wno-missing-braces","-Wno-shift-op-parentheses","-MMD","-c","-D__PROG_TYPES_COMPAT__","-mmcu=atmega328p","-DF_CPU=16000000L","-DARDUINO=185","-DARDUINO_ARCH_AVR","-Wall","-ffunction-sections","-fdata-sections","-Os","-std=gnu11","-flto","-fno-fat-lto-objects","-fdiagnostics-color=always","-fPIC","-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino","-I/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/variants/standard"]
[2019-01-17 00:23:42.1482] ===> Linker flags
[2019-01-17 00:23:42.1486] DBG: []
[2019-01-17 00:23:42.1489] ===> Source paths
[2019-01-17 00:23:42.1492] DBG: [".","src","/Users/kevin/Codes/kit/std"]
[2019-01-17 00:23:42.1497] ===> Standard prelude location
[2019-01-17 00:23:42.1543] DBG: found module <prelude> at /Users/kevin/Codes/kit/std/prelude.kit
[2019-01-17 00:23:42.1549] DBG: /Users/kevin/Codes/kit/std/prelude.kit

[bendmorris]

However kit complains setup and loop is re-declared because it is already declared in Arduino.h.

This needs to be fixed. Kit shouldn't complain about things that are declared but not implemented.

We're at least getting to code generation; if you run kitc with --no-link it'll stop at the point where it's failing, and you can try linking yourself, without -shared:

/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/gcc-avr build/obj/kit_hello.o build/obj/kit/array/kit_Array.o build/obj/kit/common/kit_CString.o build/obj/kit/io/Writable/kit_84558aa4a52e53199fd20a2b.o build/obj/kit/map/Hashable/kit_00ece7b11dd99d06a92da4ba.o build/obj/kit/map/Hashable/kit_245c01af2be1c62453ba052f.o build/obj/kit/map/Hashable/kit_2a867e0193ff634180614473.o build/obj/kit/map/Hashable/kit_84558aa4a52e53199fd20a2b.o build/obj/kit/map/Hashable/kit_a8e36feebcdf611d5ad0266f.o build/obj/kit/kit_math.o build/obj/kit/kit_mem.o build/obj/kit/mem/kit_LinearAllocator.o build/obj/kit/mem/kit_StackAllocator.o build/obj/kit/mem/Allocator/kit_0c47d7e6ba82e05c2d931be3.o build/obj/kit/mem/Allocator/kit_4221090da42112d334709b60.o build/obj/kit/mem/Allocator/kit_6381ed4a392eb3039656f126.o build/obj/kit/numeric/kit_Char.o build/obj/kit/numeric/kit_Float.o build/obj/kit/numeric/kit_Int.o build/obj/kit/numeric/kit_Size.o build/obj/kit/numeric/kit_Uint.o build/obj/kit/option/kit_Option.o build/obj/kit/kit_random.o build/obj/kit/slice/kit_Slice.o build/obj/kit/string/kit_String.o build/obj/kit/string/kit_StringBuffer.o build/obj/kit/kit_utils.o build/obj/kit/vector/kit_Vector.o -Ibuild/include -omain -lm

Thanks for the report; we can definitely make the process smoother.

[kevinresol]

Also, the gcc name is actually avr-gcc, I just symlinked it as gcc-avr so that the prefix check works

[kevinresol]

This needs to be fixed. Kit shouldn't complain about things that are declared but not implemented.

For now I hacked by removing the declaration there.

I have successfully use kit to generate the c code and compiles manually and upload an arduino and it is blinking!

[kevinresol]

Ahh, forgot to mention, I also need to disable these two lines in std/utils.kit because stderr is not supported:

// vfprintf(stderr, msg, (args...));
// fputs("", stderr);

[bendmorris]

Good note - Rust has a specific mode for embedded which disables most of its standard library, Kit will need something like that as well.

[bendmorris]

Keeping this open as a TODO. There are a few things to tackle:

• Add custom toolchain support in place of hardcoded gcc/clang support (Support for toolchain definitions and cross compilation #110)
• Declared but not defined names should be definable in Kit (Declared but not defined C names should be definable in Kit #111)
• static if needs to support defined, which should check for preprocesser defines or global names; utils.kit should only use stderr where it exists. (Add 'defined' keyword #112)
• Add a built in avr-gcc toolchain definition.