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Ld: -multible_defined defaults to "suppress"??
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Ld: -multible_defined defaults to "suppress"??


  • Subject: Ld: -multible_defined defaults to "suppress"??
  • From: Andreas Grosam <email@hidden>
  • Date: Wed, 13 Sep 2006 00:02:10 +0200

When calling the static link editor ld, the option -multiple_defined specifies how multible defined symbols in dynamic libraries will be treated. The parameter can be error, warning or suppress.

When XCode calls Ld for linking an output file, Ld suppresses multible defined symbols by default. It seems there is no parameter set explicitly for option -multible_defined from XCode, so there is the default taken.

The man page to ld tells us, that the default for this option for ld when linking two_level namespace is indeed "suppress".

I'm a bit confused, since I would strongly recommend to use "warning" for the default paramter, or better in the XCode build settings.

Multible defined symbols may become subtle errors and are almost always never intended. It may happen when people create or refactor at the shared library level, inadvertantly incorporate one definition in several shared libs, or just change visibility flags. Actually, multible defined symbols violate the one definition rule (ODR).

We can set this ld option in the target settings with the "Other Linker Flags" build option and add "-multible_defined warning".

Andreas

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