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Re: loading of module's dependencies broken with '-z now' in LDFLAGS
On Thu, 5 Nov 2015 11:59:42 +0100
Kamil Dudka <kdudka@xxxxxxxxxx> wrote:
> the build system of Fedora recently started to call linker with '-z now'.
> The ld(1) man page regarding this option says:
> "When generating an executable or shared library, mark it to tell the
> dynamic linker to resolve all symbols when the program is started, or
> when the shared library is linked to using dlopen, instead of deferring
> function call resolution to the point when the function is first called."
> This breaks loading of zsh modules that depend on other zsh modules.
> For instance, the following command fails:
> $ zsh -c 'zmodload zsh/zftp'
> zsh:1: failed to load module `zsh/zftp': /usr/lib64/zsh/5.1.1/zsh/zftp.so:
> undefined symbol: freehostent
There is certainly nothing in the current zsh build system as set up for
Linux that does this; however, there is some evidence that it got partly
thought about. To pursue this example (I think it generalises), the
Src/Modules/zftp.mdd file that defines
to say that zftp depends on zsh/net/tcp. In Src/Modules/Makefile, this
results in (together with the implicit dependency on the main shell):
LINKMODS_zftp = tcp.$(DL_EXT) $(dir_top)/Src/libzsh-$(VERSION).$(DL_EXT)
So far so good --- however, LINKDMODS_zftp isn't actually mentioned
again. A bit of research says that's because configuration says
we should use the alternative (empty) NOLINKMODS_zftp; the LINKMODS
version is only defined to be used for a few OSes in configure.ac.
I guess we need to generate something like LINKMODS_whatever that
tells it to link against the .so's as libraries? If someone can say
definitively, it might not be too hard to implement.
> ... whereas the following command succeeds:
> $ zsh -c 'zmodload zsh/net/tcp && zmodload zsh/zftp'
> Do I understand it correctly that the only solution is to tweak the build
> system not to use '-z now' while linking zsh modules?
For now, that's probably the case.
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