common symbols and GNU ld

Ian Lance Taylor iant@google.com
Wed May 11 14:50:00 GMT 2011


ali hagigat <hagigatali@gmail.com> writes:

> What is the meaning of common symbols?

http://www.airs.com/blog/archives/42

> Are they defined by .comm
> assembler directive ONLY? If I do not see .comm in the assembly
> listing of a program so that program does not have common symbols?
> right?

In MRI mode you can get a common symbol using the COMMON pseudo-op.  You
can also use the .xcom pseudo-op.  ELF targets support the .common
pseudo-op.  The x86_64 target supports the .largecomm pseudo-op.  There
are various other possibilities.

Ian



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