Red Hat Bugzilla – Bug 427787
Please add -Wl,--as-needed to the standard CFLAGS
Last modified: 2009-07-14 14:00:12 EDT
Description of problem:
-Wl,--as-needed has the effect of telling the linker to not make a binary pull
in libraries it doesn't use/need. This is actually a common thing in the world
of pkg-config sadly. The effect of pulling such spurious libraries in is that
programs use more memory and take longer to start up.
The theoretical downside would be (and this is why it isn't default in ld)
that a program could have plugins, where the program links to a library with
the sole purpose of providing it to plugins, while the plugins aren't linked
to the library. IMO that's broken and in practice this doesn't actually happen
(in practice the plugins will link to the library they depend on)
Jakub, thoughts / comments?
--as-needed is a positional switch, which doesn't nest, so the next
--no-as-needed which e.g. gcc inserts after -lgcc_s cancels it anyway. Setting
this in rpm is IMHO a bad idea, it should be done in pkg-config/libtool, enable
it before libraries which aren't necessarily needed and turn it again off after
Despite what you say, adding it to the CFLAGS does have a positive effect; the
autoconf/automake packages don't depend on the implicit CFLAGS pickup (which
would be before -lgcc_s), but add their own explicit CFLAGS on the gcc command
line so it's still in effect.
While I don't disagree with your "it should be done in pkg-config".. that's
something that was true 3 years ago as well.. but unlikely to change.
Adding it to fedora cflags does have a positive effect... do you see any
Anyone got any objections to just adding this?
Changing version to '9' as part of upcoming Fedora 9 GA.
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