Compiler/MSP430F67691: Linker: unable to put .cinit into output section of a group

Carl Hagenmaier

Tool/software: TI C/C++ Compiler

My linker command file (in part) is

    GROUP > FLASH:
   {
        first_section
       {
           -lxxx.lib(.text, .const, .cinit) {}
       }
        second_section
       {
           *(.text)
           *(.const)
        }
   } crc_table(mdu_crc_table, algorithm=CRC16_CCITT)
   .cinit       : {} crc_table(mdu_crc_table, algorithm=CRC16_CCITT) > FLASH

This seems to work. It creates a crc_table with three entries for first, second and .cinit sections. I want to reduce this to two entries. I've tried to move ".cinit" into "second_section" using several different syntax, but all fail in some way. For example

    GROUP > FLASH:
   {
       first_section
       {
           -lxxx.lib(.text, .const, .cinit) {}
       }
        second_section
       {
           *(.text)
           *(.const)
            *(.cinit)
       }
   } crc_table(mdu_crc_table, algorithm=CRC16_CCITT)

generates a #10068-D no matching section warning for *(.cinit) and doesn't applocate.cinit correctly. Any suggestions?

over 8 years ago

0 Archaeologist over 8 years ago

TI__Guru* 84285 points

For one thing, .cinit must be a contiguous section; you can't have two different output sections containing .cinit input sections.

0 Carl Hagenmaier over 8 years ago in reply to Archaeologist

Intellectual 310 points

Thanks for the suggestion. Are you referring to the .cinit in first_section? That may also be a problem, but when I remove .cinit from the first section I still get "no matching section."

GROUP > FLASH:
{
first_section
{
-lxxx.lib(.text, .const) {} /* removed .cinit from here */
}
second_section
{
*(.text)
*(.const)
*(.cinit)
}
} crc_table(mdu_crc_table, algorithm=CRC16_CCITT)

0 George Mock over 8 years ago in reply to Carl Hagenmaier

TI__Guru**** 253010 points

While I'm not certain, I'm pretty sure the .cinit input sections must be collected together into an output section also named .cinit. They cannot be combined with other input sections into some output section of a different name. I'll check on that and get back to you.

Thanks and regards,

-George

0 George Mock over 8 years ago in reply to George Mock

TI__Guru**** 253010 points

My last answer is partly correct, and partly wrong.

Please see the section titled Variable Initialization in the MSP430 Embedded Application Binary Interface. You'll learn that there must a distinct output section for the purpose of variable initialization. The section name is not strictly part of the specification, but by violating the near universal convention of naming this section .cinit, you are likely to create more problems than you solve. The .cinit output section cannot contain anything from yet other input sections. The section type is SHT_TI_INITINFO, and no other output section can be this type.

Thanks and regards,

-George

Code Composer Studio™︎

Code Composer Studio forum

Compiler/MSP430F67691: Linker: unable to put .cinit into output section of a group