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Document the effect of --as-needed on --rpath on Linux based systems.

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* ld.texi (Options): Add note about the effect of --as-needed on
	the --rpath and --rpath-link options on Linux based systems.
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Nick Clifton 2021-04-13 14:37:06 +01:00
parent 0256da25c0
commit 6418520e7f
2 changed files with 21 additions and 0 deletions
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ld/ChangeLog
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@ -1,3 +1,8 @@
2021-04-13 Nick Clifton <nickc@redhat.com>
* ld.texi (Options): Add note about the effect of --as-needed on
the --rpath and --rpath-link options on Linux based systems.
2021-04-13 Alan Modra <amodra@gmail.com>
PR 27722

16
ld/ld.texi
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@ -1560,6 +1560,11 @@ the library in question do not affect whether the library is seen as
needed. This is similar to the rules for extraction of object files
from archives. @option{--no-as-needed} restores the default behaviour.
Note: On Linux based systems the @option{--as-needed} option also has
an affect on the behaviour of the @option{--rpath} and
@option{--rpath-link} options. See the description of
@option{--rpath-link} for more details.
@kindex --add-needed
@kindex --no-add-needed
@item --add-needed
@ -2323,8 +2328,19 @@ Any directories specifed by a @code{SEARCH_DIR} command in the
linker script being used.
@end enumerate
Note however on Linux based systems there is an additional caveat: If
the @option{--as-needed} option is active @emph{and} a shared library
is located which would normally satisfy the search @emph{and} this
library does not have DT_NEEDED tag for @file{libc.so}
@emph{and} there is a shared library later on in the set of search
directories which also satisfies the search @emph{and}
this second shared library does have a DT_NEEDED tag for
@file{libc.so} @emph{then} the second library will be selected instead
of the first.
If the required shared library is not found, the linker will issue a
warning and continue with the link.
@end ifset
@kindex -shared