input-section-common.html

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<h5 class="subsubsection">Input section for common symbols</h5>



   <p>A special notation is needed for common symbols, because in many object

file formats common symbols do not have a particular input section.  The

linker treats common symbols as though they are in an input section

named <code>COMMON</code>.



   <p>You may use file names with the <code>COMMON</code> section just as with any

other input sections.  You can use this to place common symbols from a

particular input file in one section while common symbols from other

input files are placed in another section.



   <p>In most cases, common symbols in input files will be placed in the

<code>.bss</code> section in the output file.  For example:

<pre class="smallexample">     .bss { *(.bss) *(COMMON) }

     </pre>



   <p>Some object file formats have more than one type of common symbol.  For

example, the MIPS ELF object file format distinguishes standard common

symbols and small common symbols.  In this case, the linker will use a

different special section name for other types of common symbols.  In

the case of MIPS ELF, the linker uses <code>COMMON</code> for standard common

symbols and <code>.scommon</code> for small common symbols.  This permits you

to map the different types of common symbols into memory at different

locations.



   <p>You will sometimes see <code>[COMMON]</code> in old linker scripts.  This

notation is now considered obsolete.  It is equivalent to

<code>*(COMMON)</code>.



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