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lib_compat_mode=off is ineffective

See original GitHub issue

What kind of issue is this?

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

Configuration

Operating system: macOS 10.14.5

PlatformIO Version (platformio --version): 4.0.0

Description of problem

The lib_compat_mode=off option is not respected. Incompatible libraries are still rejected.

Steps to Reproduce

$ platformio init
$ cat > platformio.ini
[global]
lib_compat_mode = off

[env:kbox32]
platform = https://github.com/platformio/platform-espressif32.git
framework = espidf
board = esp32dev
build_flags = -DKBOX32_SSID=\"YOURWIFI\" -DKBOX32_PASSWORD=\"YOURWIFIPASSWORD\" -fexceptions
lib_compat_mode = off

cat > src/main.cpp
#include <AsyncTCP.h>

int main()
{
  return 0
}

$ platformio run -vv

Actual Results

Processing project (platform: espressif32; lib_deps: AsyncTCP; lib_compat_mode: off; board: esp32dev; framework: espidf)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
CONFIGURATION: https://docs.platformio.org/page/boards/espressif32/esp32dev.html
PLATFORM: Espressif 32 1.9.0 #2c1b430 (git+https://github.com/platformio/platform-espressif32.git) > Espressif ESP32 Dev Module
HARDWARE: ESP32 240MHz, 320KB RAM, 4MB Flash
DEBUG: Current (esp-prog) External (esp-prog, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa)
PACKAGES: toolchain-xtensa32 2.50200.80 (5.2.0), framework-espidf 3.30202.190627 (3.2.2), tool-esptoolpy 1.20600.0 (2.6.0)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ off
Framework incompatible library /Users/thomas/Desktop/testcompat/.pio/libdeps/project/AsyncTCP_ID1826
More details about "Library Compatibility Mode": https://docs.platformio.org/page/librarymanager/ldf.html#ldf-compat-mode
Found 0 compatible libraries

Expected Results

The library should be included in the compilation.

This is what the documentation says:

off: | Does not check for compatibility (is not recommended)

soft: [DEFAULT] Checks for the compatibility with framework from build environment

strict: Checks for the compatibility with framework and platform from build environment.

This mode can be changed using lib_compat_mode option in “platformio.ini” (Project Configuration File). Default value is set to soft.