Core creates main.cpp file for STM8 Arduino core which needs main.c

[maxgerhardt]

What kind of issue is this?

• PlatformIO Core.
  If you’ve found a bug, please provide an information below.

You can erase any parts of this template not applicable to your Issue.

---

Configuration

Operating system: Win10 x64

PlatformIO Version (platformio --version): version 5.1.1a3

Description of problem

When a new project for any STM8 board with the Arduino framework is created, the PlatformIO core logic at

platformio-core/platformio/commands/home/rpc/handlers/project.py

Lines 206 to 244 in 81c7e23

	def _generate_project_main(project_dir, framework):
	main_content = None
	if framework == "arduino":
	main_content = "\n".join(
	[
	"#include <Arduino.h>",
	"",
	"void setup() {",
	" // put your setup code here, to run once:",
	"}",
	"",
	"void loop() {",
	" // put your main code here, to run repeatedly:",
	"}",
	"",
	]
	)
	elif framework == "mbed":
	main_content = "\n".join(
	[
	"#include <mbed.h>",
	"",
	"int main() {",
	"",
	" // put your setup code here, to run once:",
	"",
	" while(1) {",
	" // put your main code here, to run repeatedly:",
	" }",
	"}",
	"",
	]
	)
	if not main_content:
	return project_dir
	with fs.cd(project_dir):
	config = ProjectConfig()
	src_dir = config.get_optional_dir("src")
	main_path = os.path.join(src_dir, "main.cpp")

will always create a src/main.cpp file. This however is wrong since for the STM8, the implementation is written in C and users must also use C files (The SDCC compiler does not support C++). All the examples use .c files.

Refer to topic https://community.platformio.org/t/unable-to-compile-new-created-project-for-stm8s-board/19766 and platformio/platform-ststm8#21 (comment)

Maybe this change is also needed in other platforms. Besides STM8 I can't think of other C-only Arduino core implementations (Intel 8080 doesn't have a core)

Steps to Reproduce

1. Open PlatformIO Home
2. Create new project
3. Select e.g. "sduino UNO" as board and "Arduino" as framework
4. Create project

Actual Results

A src/main.cpp file with template code is generated and compilation fails because the it attempts to use the system's CXX / C++ compiler.

Expected Results

A src/main.c file is generated.

Due to a quirk in the SDCC compiler however, a semantically empty sketch fails to link, so a linking error after that is expected.. maybe a different template can be used there.

If problems with PlatformIO Build System:

-/-

Additional info

-/-