Pero:
EDIT: Hey, I think I got it! Well, it seems that platformio prefers to have its variants in the original folder, that is C:\Users.platformio\packages/… Only when I moved my “my_variant” folder there, did it finish the build without errors! Any thoughts why is that so?
Support of the board_build.variants_dir is builder-script dependent.
The builder scripts for NordicNRF52 + Arduino do not allow changing the variant directory. It is constantly pointed to the actual framework package’s variants directory.
if "build.variant" in board:
env.Append(CPPPATH=[
join(FRAMEWORK_DIR, "variants", board.get("build.variant"))
])
libs.append(
env.BuildLibrary(
join("$BUILD_DIR", "FrameworkArduinoVariant"),
join(FRAMEWORK_DIR, "variants",
board.get("build.variant"))))
This is in contrast to Atmel SAM + Arduino where build.variants_dir is used
libs = []
if "build.variant" in board:
variants_dir = os.path.join(
"$PROJECT_DIR", board.get("build.variants_dir")) if board.get(
"build.variants_dir", "") else os.path.join(FRAMEWORK_DIR, "variants")
env.Append(
CPPPATH=[
os.path.join(variants_dir, board.get("build.variant"))
],
LIBPATH=[
os.path.join(variants_dir, board.get("build.variant"))
],
)
libs.append(env.BuildLibrary(
os.path.join("$BUILD_DIR", "FrameworkArduinoVariant"),
os.path.join(variants_dir, board.get("build.variant"))
))
And hence you observe that difference.
An issue about this has been opened in Support build.variants_dir · Issue #11 · platformio/builder-framework-arduino-nrf5 · GitHub .