[SOLVED] SEGGER_RTT_ASM_ARMv7M.S assembler error: bad instruction

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  • [SOLVED] SEGGER_RTT_ASM_ARMv7M.S assembler error: bad instruction

    Hi all,

    I downloaded newest Segger System Viewer V332 and tried to integrate the target specific Segger Systemviewer sources into my STM32F429BG uC project.
    When I building the project with the GNU GGC compiler V9-2020q2 I will get some assemler errors when compiling segger file SEGGER_RTT_ASM_ARMv7M.S (see attachement)

    Why has the gnu gcc assembler problems with this assembler file ?

    Thanks a lot for your support.

    Best Regards
    Jochen
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    The post was edited 1 time, last by Jochen_080877 ().

  • In the meantime, I found the bug by myself.
    I renamed the assembler file from SEGGER_RTT_ASM_ARMv7M.S to SEGGER_RTT_ASM_ARMv7M.s, because all of my assembler files (e.g. startup ...) has a lowercase "s" ending.

    The GNU GCC assembler interprets this as a normal assembler file but SEGGER_RTT_ASM_ARMv7M contains assembler code which must be pre-processed and therefore it is notated as a upercase "S" !

    Looking into the GNU GCC documentation, there is a description how the assembler interprets files with ".s" and ".S" endings.

    So, if I leave the file unchanged with the uppercase ending ".S", the assembler builds the file with no errors
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  • Hello,

    Thank you for your inquiry.

    Your analysis is correct. That is why we ship the file with the .S ending, so the file runs first through a preprocessor so it is compatible to different assembler syntaxes from different tool chains.

    Case closed.

    Best regards,
    Nino
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