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Section attribute ignored; why?

SPH
Intellectual 635 points

Hi,

I'm trying to make use of the 'section' attribute with v7.3.2 of the codegen tools. I've read the GCC documentation linked to from the compiler UG (http://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Variable-Attributes.html#Variable-Attributes) but even a simple case (which appears to be compliant with the GCC documentation) such as:

int a[10] __attribute__ ((section("testSect"))) = {0};

results in:

"main.c", line 98: warning: attribute "section" ignored

What am I missing in trying to make use of this attribute?

Thanks,

SPH

  • 0
    Intellectual 705 points

    Try to add extra "#" at the end of the section name:

    int a[10] __attribute__ ((section("testSect#"))) = {0};

    Also, you may try to get assembler source to check by adding "-S" argument to the gcc. Try to get object file ("-c" option) and then inspect it with objdump.

  • 0 in reply to Anton Kachalov
    Intellectual 635 points

    Anton,

    I gave this a go and it made no difference; I still got the warning. I checked the assembler output and it appears that the compiler is true to its word: the section attribute has been ignored and the variable 'a' has been put in ".fardata:a".

    Thanks,

    SPH

  • 0 in reply to SPH
    Intellectual 705 points

    Could you please provide a complete compiler's command invocation?

    What compiler version do you use (option "-v")?

  • 0 in reply to Anton Kachalov
    Intellectual 635 points

    Anton Kachalov said:

    Could you please provide a complete compiler's command invocation?

    cl6x -qq -O3 -mi200 -mv6455 -mt -mw -oi -pdr <Lots of -I options> <Lots of -D options> --abi=eabi -k -fr <Tmp dir> -fs <Tmp dir> -ft <Tmp dir> main.c

    Anton Kachalov said:

    What compiler version do you use (option "-v")?

    '-v' doesn't appear to be a valid option but '-h' only gives the version of the cgtools that I stated in my opening mail:

    C:\BuildTools\ti_cgtools_v7_3\A\bin>cl6x -v
    >> WARNING: invalid compiler option -v (ignored)
    >> ERROR: no source files, nothing to do

    C:\BuildTools\ti_cgtools_v7_3\A\bin>cl6x -h
    TMS320C6x C/C++ Compiler                v7.3.2
    Tools Copyright (c) 1996-2011 Texas Instruments Incorporated

    Do you need a more accurate build number?

    Cheers,

    SPH

  • 0 in reply to SPH
    Intellectual 705 points

    Try to add "--gcc" option to the cl6x to enable GCC C language extensions.

  • 0 in reply to Anton Kachalov
    Intellectual 635 points

    Thanks, this did the trick. I was already using the aligned attribute without it so I wrongly assumed that all attributes were supported without it. It is a shame that I can't have attributes without the other GCC extensions (for portability reasons) but at least this fixed my problem. Ta!

    SPH