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J. Nick Koston
33118e0e57
Two issues from the cb3s smoke test: - The previous CPPDEFINES-only variant detection missed the USE_LIBRETINY_VARIANT_* define on BK72xx in the pre-script environment, so no patcher registered and the .sram.text section silently landed in flash. Check BUILD_FLAGS as a fallback so the define is picked up regardless of when PlatformIO finishes populating CPPDEFINES. - When the variant could not be detected, or no .ld file was modified, the script exited quietly and the firmware linked with IRAM_ATTR functions in flash — the exact bug this PR is trying to fix. Raise a RuntimeError in all three failure cases (variant missing, variant unknown, no .ld patched) so the build fails loudly instead of producing broken firmware.
