problems building a BME680 app: zephyr_prebuilt.elf uses VFP register arguments ....


Abderrezak Mekkaoui
 

Hi All,
I am having problems porting a BME680 app to Zephyr. This app uses a pre-compiled library (libalgobsec.a) provided by Bosch.
It builds and runs correctly on mynewt (using the exact same tool chain and the same flags). After solving few issues related to stdint I am struggling with the last issues possibly related incompatibilities between different libraries.
I think I am using the right compiler and linker flags (see below) but I may be wrong.
Any hints/help would be greatly appreciated.
Regards
Abderrezak

P.S. I have other apps that  build and run correctly using the same tool chain (but use the default zephyr flags and have no need for an external binary library). I am using a custom nrf52840 based board.



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CMakelists.txt (latest flag settings, many other combinations all failed)

target_link_libraries(app libalgobsec.a)
target_link_libraries(app libm.a)

set(FPU_FOR_cortex-m4      fpv4-sp-d16)
target_link_libraries(app m.a)
zephyr_cc_option(-DFLOAT_ABI_HARD -mcpu=cortex-m4 -mthumb-interwork -mthumb -mabi=aapcs -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fno-exceptions -ffunction-sections -fdata-sections )
zephyr_ld_options(-static -specs=nosys.specs -lgcc -Wl,--gc-sections -nostartfiles -mthumb -mabi=aapcs -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DFLOAT_ABI_HARD -lalgobsec -lm)
#

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Error messages (only few lines)

/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: error: zephyr\zephyr_prebuilt.elf uses VFP register arguments, c:/program files (x86)/gnu tools arm embedded/7.0 2017q4/bin/../lib/gcc/arm-none-eabi/7.2.1/thumb/v7e-m\libgcc.a(_popcountsi2.o) does not
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: failed to merge target specific data of file c:/program files (x86)/gnu tools arm embedded/7.0 2017q4/bin/../lib/gcc/arm-none-eabi/7.2.1/thumb/v7e-m\libgcc.a(_popcountsi2.o)
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: error: zephyr\zephyr_prebuilt.elf uses VFP register arguments, c:/program files (x86)/gnu tools arm embedded/7.0 2017q4/bin/../lib/gcc/arm-none-eabi/7.2.1/thumb/v7e-m\libgcc.a(_udivmoddi4.o) does not
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: failed to merge target specific data of file c:/program files (x86)/gnu tools arm embedded/7.0 2017q4/bin/../lib/gcc/arm-none-eabi/7.2.1/thumb/v7e-m\libgcc.a(_udivmoddi4.o)
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: error: zephyr\zephyr_prebuilt.elf uses VFP register arguments, c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib\libm.a(lib_a-sf_exp.o) does not
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: failed to merge target specific data of file c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib\libm.a(lib_a-sf_exp.o)
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: error: zephyr\zephyr_prebuilt.elf uses VFP register arguments, c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib\libm.a(lib_a-sf_exp2_data.o) does not
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: failed to merge target specific data of file c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib\libm.a(lib_a-sf_exp2_data.o)
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: error: zephyr\zephyr_prebuilt.elf uses VFP register arguments, c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib\libm.a(lib_a-sf_fabs.o) does not
c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: failed to merge target specific data of file c:/progra~2/gnutoo~1/70922~1.020/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib\libm.a(lib_a-sf_fabs.o)

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