I'm trying to port a project from Cortex M0 to Cortex M4 with hardware floating point extension, the new target soc is nRF52832.
The error I am getting from the linker is the following
arm-unknown-eabi/bin/ld: error: x.o uses VFP register arguments, firmware does not
where firmware is the name of the output file fro the linker.
This is an issue with the arm ABI for floating point, I want to use the FPU as it is requested by the FreeRTOS port I want to use but I don't get how to tweak my linker flags to make it possible.
This is the set of linker flags I'm currently using
-L/path/to/nrfx/mdk
-Wl, --no-undefined
-Wl,--as-needed -march=armv7e-m+fp -mthumb -mfloat-abi=hard -mabi=aapcs
-Wl, --start-group support/libs/libQRCode.a support/libs/libSPIFFS.a
-Wl, --no-undefined
-Wl, --as-needed
-Wl, --gc-sections --specs=nosys.specs -T/path/to/linker_script.ld /toolchain/path/to/lib/libm.a
-Wl, --end-group