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* c.texi (Allocating File-Scope): Fix -fcommon description. 

The default depends on GCC's release and target; no
--warn-common is supported.
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Ineiev 2025-04-26 14:19:27 +00:00
parent 6513ea4238
commit c677be889b
1 changed files with 3 additions and 2 deletions
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@ -9833,11 +9833,12 @@ the same variable in this way, and that is sufficient for all of them
to use the variable. to use the variable.
@c @opindex -fno-common @c @opindex -fno-common
@c @opindex --warn_common @c @opindex -fcommon
In programs that are very large or have many contributors, it may be In programs that are very large or have many contributors, it may be
wise to adopt the convention of never using tentative definitions. wise to adopt the convention of never using tentative definitions.
You can use the compilation option @option{-fno-common} to make them You can use the compilation option @option{-fno-common} to make them
an error, or @option{--warn-common} to warn about them. an error, or @option{-fcommon} to enable them. The default depends
on the version of GCC and its target.
If a file-scope variable gets its space through a tentative If a file-scope variable gets its space through a tentative
definition, it starts out containing all zeros. definition, it starts out containing all zeros.