[Bug gold/18614] New: Common symbols with local binding are not allocated by the linker

[c-addison at ti dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18614

            Bug ID: 18614
           Summary: Common symbols with local binding are not allocated by
                    the linker
           Product: binutils
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: c-addison at ti dot com
                CC: ian at airs dot com
  Target Milestone: ---

Created attachment 8401
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8401&action=edit
Test case containing main.o, local_common.o, and global_common.o

It appears that the linker does not allocate space for common symbols that are
STB_LOCAL in the memory map. The symbol value, which is the alignment, is used
as the address for the symbol in the final executable. I am attaching two
object files produced by the TI ARM compiler, one with a local common symbol
and the other with a global common symbol. You can build:

arm-none-eabi-ld main.o local_common.o

If you examine the executable created by that link, the symbol local_x remains
a common symbol in the executable file. You will also see that the references
to local_x have the value 0x4, which is incorrect.

arm-none-eabi-ld main.o global_common.o

If you examine this executable file, you will see that the symbol global_x is
correctly allocated.

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