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OpenMV Camera Module
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Compilation error #205

Closed terrycmchan closed 7 years ago

terrycmchan commented 7 years ago

Hi, `` I referenced the webpage https://github.com/openmv/openmv/wiki/Firmware-Development, and make the firmware. I got the compilation errors as below: CC src/dsp/MatrixFunctions/arm_mat_add_q15.c src/dsp/MatrixFunctions/arm_mat_add_q15.c: In function 'arm_mat_add_q15': src/dsp/MatrixFunctions/arm_mat_add_q15.c:109:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] SIMD32(pOut)++ = QADD16(SIMD32(pInA)++, *SIMD32(pInB)++); ^ src/dsp/MatrixFunctions/arm_mat_add_q15.c:109:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] src/dsp/MatrixFunctions/arm_mat_add_q15.c:109:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] src/dsp/MatrixFunctions/arm_mat_add_q15.c:110:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] SIMD32(pOut)++ = QADD16(SIMD32(pInA)++, *SIMD32(pInB)++); ^ src/dsp/MatrixFunctions/arm_mat_add_q15.c:110:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] src/dsp/MatrixFunctions/arm_mat_add_q15.c:110:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] cc1: all warnings being treated as errors make[1]: [/home/terrychan/workspace_stm23/openmv/src/build/cmsis/src/dsp/MatrixFunctions/arm_mat_add_q15.o] Error 1 make[1]: Leaving directory '/home/terrychan/workspace_stm23/openmv/src/cmsis' make: [FIRMWARE_OBJS] Error 2

Can anyone help? Thanks!

Terry

iabdalkader commented 7 years ago

Hi, I think you have an old toolchain, what's the gcc version ?

arm-none-eabi-gcc -v

The last tested toolchain is 2016-q3 you can find it here: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads

terrycmchan commented 7 years ago

I am using gcc in version as below. gcc version 6.3.1 20170215 (release) [ARM/embedded-6-branch revision 245512] (GNU Tools for ARM Embedded Processors 6-2017-q1-update)

iabdalkader commented 7 years ago

2016-q3 is gcc 5.4 maybe newer gcc issue warnings for that code, could you try adding -Wno-error=strict-aliasing to the main Makefile CFLAGS? CFLAGS += -std=gnu99 -Wall -Werror -Warray-bounds -mthumb -nostartfiles -mabi=aapcs-linux -fdata-sections -ffunction-sections -Wno-error=strict-aliasing

terrycmchan commented 7 years ago

Hi iabdalkader, It works. Thanks. But is it a workaround?

iabdalkader commented 7 years ago

Yes for now, it stops that specific warning from being made into an error, note that DSP code is not actually used and it's STM code, next time I update the toolchain I'll fix it anyway.

terrycmchan commented 7 years ago

Thanks!