Hello to everyone, I need help in compiling demos on STM32F7Discovery board. I'm using Eclipse as IDE and arm-none-eabi gcc compiler from launchpad Steps that I'm doing: 1) edit the Makefile in ugfx/boards/base/STM32F746-Discovery/example_raw32: GFXLIB = /home/vlad/Program_Files/ARM_Eclipse/workspace/ugfx STMHAL = /home/vlad/Program_Files/ARM_Eclipse/STM32Cube_FW_F7_V1.2.0/Drivers/STM32F7xx_HAL_Driver CMSIS = /home/vlad/Program_Files/ARM_Eclipse/STM32Cube_FW_F7_V1.2.0/Drivers/CMSIS 2) make. After compilation with some warnings it fails to link the .elf: Linking .build/example_raw32.elf /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: error: .build/example_raw32.elf uses VFP register arguments, /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-init.o) does not /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-init.o) /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: error: .build/example_raw32.elf uses VFP register arguments, /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-memcpy.o) does not /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-memcpy.o) /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: error: .build/example_raw32.elf uses VFP register arguments, /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-memset.o) does not /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-memset.o) /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: error: /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-setjmp.o): Conflicting CPU architectures 13/1 /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-setjmp.o) /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: error: .build/example_raw32.elf uses VFP register arguments, /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-strcpy.o) does not /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-strcpy.o) /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: error: .build/example_raw32.elf uses VFP register arguments, /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-strlen.o) does not /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-strlen.o) collect2: error: ld returned 1 exit status /home/vlad/Program_Files/ARM_Eclipse/workspace/ugfx/tools/gmake_scripts/compiler_gcc.mk:282: recipe for target '.build/example_raw32.elf' failed make: *** [.build/example_raw32.elf] Error 1 3) googling (http://stackoverflow.com/questions/9753 ... bject-file) gives that probably mfloat-abi shold be set to softfp rather than hard. So I tried to change the file ugfx/tools/gmake_scripts/cpu_stm32m7.mk: SRCFLAGS += -mcpu=cortex-m7 -falign-functions=16 -mfloat-abi=softfp -mfpu=fpv4-sp-d16 LDFLAGS += -mcpu=cortex-m7 -falign-functions=16 -mfloat-abi=softfp -mfpu=fpv4-sp-d16 DEFS += CORTEX_USE_FPU=TRUE USE_FPU=softfp and received another strange linker error: Linking .build/example_raw32.elf /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: error: /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-setjmp.o): Conflicting CPU architectures 13/1 /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld: failed to merge target specific data of file /home/vlad/Program_Files/ARM_Eclipse/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/libc.a(lib_a-setjmp.o) collect2: error: ld returned 1 exit status /home/vlad/Program_Files/ARM_Eclipse/workspace/ugfx/tools/gmake_scripts/compiler_gcc.mk:282: recipe for target '.build/example_raw32.elf' failed make: *** [.build/example_raw32.elf] Error 1 4) I tried compiler versions gcc-arm-none-eabi-4_9-2015q1 and gcc-arm-none-eabi-4_9-2015q3 but they behaves the same. I saw a video on youtube with successful demonstration of demo on STM32F7Discovery so most probably I'm missing something to compile it. I would appreciate for any help. Thanks in advance, Vlad.