On Nov 11, 2007, at 8:12 PM, Jean-François Mertens wrote:
I see in an excerpt of 'man ld' for 10.5 that ld now has an option '-dead_strip_dylibs'. I would strongly favour adding this as a default LDFLAG (conditional to 10.5). It does have the potential, when used systematically, to substantially reduce our deps ...
Interesting! I'm testing this with some of my packages and it seems to work well. For instance, curl went from
$ otool -L /sw/bin/curl /sw/bin/curl:/sw/lib/libcurl.4.dylib (compatibility version 5.0.0, current version 5.1.0) /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos (compatibility version 5.0.0, current version 5.0.0) /usr/lib/libresolv.9.dylib (compatibility version 1.0.0, current version 19.0.0) /sw/lib/libssh2.1.dylib (compatibility version 2.0.0, current version 2.0.0) /usr/lib/libssl.0.9.7.dylib (compatibility version 0.9.7, current version 0.9.7) /usr/lib/libcrypto.0.9.7.dylib (compatibility version 0.9.7, current version 0.9.7) /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3) /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.0.0)
to this $ otool -L /sw/bin/curl /sw/bin/curl:/sw/lib/libcurl.4.dylib (compatibility version 5.0.0, current version 5.1.0) /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.0.0)
Only libcurl links to the other libraries. I did this by adding SetLDFLAGS: -Wl,-dead_strip_dylibs to the info file. I think it's necessary to use the "-Wl," construction with libtool, though I didn't try without.
I don't think it's a good idea to make this a default though. There are too many chances for surprises.
Daniel
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