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On Fri, 22 Jan 2010 12:49:27 +0000 (UTC) |
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Duncan <1i5t5.duncan@×××.net> wrote: |
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> |
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> Meanwhile, it's also worth considering LDFLAGS. Here's mine: |
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> |
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> LDFLAGS="-Wl,-z,now,--as-needed,-O1,--hash-style=gnu,--sort-common" |
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> |
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> --as-needed is the one most folks will be interested in. There's talk of |
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> eventually making this the Gentoo default, as it can DRAMATICALLY reduce |
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> the number of reverse dependency breakage of the sort revdep-rebuild |
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> fixes. I'm talking an order of magnitude reduction, having to rebuild |
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> maybe 1/10 of the packages that would have to be rebuilt without it. |
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> Problems with this one should now be quite rare indeed, |
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> |
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I've been using the "--as-needed" option for some time now and |
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probably most of my system has been rebuilt with it. |
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In my experience, the only package where "--as-needed" causes |
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problems is libdrm, which will not compile using this option. |
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The solution is to define a specific LDFLAGS variable without |
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"--as-needed" just for libdrm in the /etc/portage/env directory. |
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I forget what this method is called, but using the /etc/portage/env |
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directory is one way to allow CFLAGS, LDFLAGS, etc. to be |
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customized for individual packages. |
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Another example of this kind of customization is that both Python |
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and Sqlite supposedly perform better with "-O3" in the CFLAGS variable. |
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By making an appropriate entry into /etc/portage/env one can specify |
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"-O3" just for these packages but use "-O2" for all other packages. |
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Frank Peters |
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