[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Darwin & Dynamic modules

From: Christoph Pfisterer
Subject: Re: Darwin & Dynamic modules
Date: Sun, 16 Sep 2001 16:16:13 +0200

Max Horn wrote:
OK, I think I just found out that this is the reason modules are not built right on darwin:

# Commands used to build and install a shared archive.
archive_cmds="\$CC \$(test \\"x\$module\\" = xyes && echo -bundle || echo -dynamiclib) \$allow_undefined_flag -o \$lib \$libobjs \$deplibs\$linker_flags -install_name \$rpath/\$soname \$verstring"

Changing the two \\" to \" worked nicely for me. Libtool, with this change, produces modules now when asked for them.

As Guido noted this is in fact an old problem and has been fixed before. Unfortunately, it was reintroduced into branch-1-4 and HEAD when my latest Darwin support patch was merged on September 2nd. The 1.4.1 and 1.4.2 releases are affected by this. Some quotes:

Before (libtool.m4 revision
archive_cmds='$nonopt $(test .$module = .yes && echo -bundle || echo -dynami clib) $allow_undefined_flag -o $lib $libobjs $deplibs$linker_flags -install_name $rpath/$soname $(test -n "$verstring" -a x$verstring != x0.0 && echo $verstring

My submitted patch:
    archive_cmds='$nonopt $(test .$module = .yes && echo -bundle || echo -dynam
iclib) $allow_undefined_flag -o $lib $libobjs $deplibs$linker_flags -install_nam
e $rpath/$soname $verstring'

After (libtool.m4 revision
archive_cmds='$nonopt $(test "x$module" = xyes && echo -bundle || echo -dyna miclib) $allow_undefined_flag -o $lib $libobjs $deplibs$linker_flags -install_na
me $rpath/$soname $verstring'

I actually explained in my mail at the time that double quotes don't work in archive_cmds with zsh, which forced me to move the $verstring handling to I guess that was a case of pre-release stress.

As for the convenience library issue: Gary refused the patch saying that it breaks the cdemo tests. It was not said on which platform, but I assume it was Linux. Actually, I was able to reproduce the failure on my Debian Linux box (potato w/ 2.4 kernel) with branch-1-4 as of Wednesday. After reverting back to a clean copy, running cdemo-conf and cdemo-make in verbose mode produces these command lines at the end of cdemo-make (still on Linux):

  /bin/sh ./libtool --mode=link gcc  -g -O2  -o cdemo  main.o
  gcc -g -O2 -o cdemo main.o  ./.libs/ -lm

As I understand it, listing a convenience library on the link command line is supposed to be equivalent to listing its member objects. 'cdemo/libtool --config' shows that libtool knows the special flags to accheive this:

whole_archive_flag_spec="\${wl}--whole-archive\$convenience \${wl}--no-whole-archive"

For some reason, this is not used in this situation. My conclusion is that convenience library linking is broken as it is and needs to be fixed. That the patch that fixes it on Darwin breaks other platforms is just a symptom of greater breakage.

I'll be happy to provide more information if required.

Hope this helps,

chrisp a.k.a. Christoph Pfisterer   "Any sufficiently advanced
address@hidden -      bug is indistinguishable
PGP key & geek code available        from a feature."

reply via email to

[Prev in Thread] Current Thread [Next in Thread]