This code is timing sensitive and seems to break with LTO enabled (at least on avr-gcc 8.3.0... it worked on older gcc versions). This is the same workaround as #7558 applied for the Helix.
Lily58
Lily58 is 6×4+5keys column-staggered split keyboard.
Keyboard Maintainer: Naoki Katahira Twitter:@F_YUUCHI
Hardware Supported: Lily58 PCB, ProMicro
Hardware Availability: PCB & Case Data
Make example for this keyboard (after setting up your build environment):
sudo make lily58:default
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.