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flameeyes 08/07/31 08:45:48 |
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|
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Modified: asneeded.xml |
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Log: |
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Remove the "Binutils bugs" section as it's no longer relevant (Binutils 2.16 is no longer widely used). |
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Replace the (wrong) filter example with the correct filter. |
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|
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Revision Changes Path |
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1.15 xml/htdocs/proj/en/qa/asneeded.xml |
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|
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file : http://sources.gentoo.org/viewcvs.py/gentoo/xml/htdocs/proj/en/qa/asneeded.xml?rev=1.15&view=markup |
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plain: http://sources.gentoo.org/viewcvs.py/gentoo/xml/htdocs/proj/en/qa/asneeded.xml?rev=1.15&content-type=text/plain |
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diff : http://sources.gentoo.org/viewcvs.py/gentoo/xml/htdocs/proj/en/qa/asneeded.xml?r1=1.14&r2=1.15 |
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|
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Index: asneeded.xml |
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=================================================================== |
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RCS file: /var/cvsroot/gentoo/xml/htdocs/proj/en/qa/asneeded.xml,v |
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retrieving revision 1.14 |
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retrieving revision 1.15 |
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diff -u -r1.14 -r1.15 |
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--- asneeded.xml 25 Jan 2008 18:11:51 -0000 1.14 |
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+++ asneeded.xml 31 Jul 2008 08:45:47 -0000 1.15 |
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@@ -1,6 +1,6 @@ |
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<?xml version="1.0" encoding="UTF-8"?> |
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<!DOCTYPE guide SYSTEM "http://www.gentoo.org/dtd/guide.dtd"> |
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-<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/proj/en/qa/asneeded.xml,v 1.14 2008/01/25 18:11:51 flameeyes Exp $ --> |
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+<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/proj/en/qa/asneeded.xml,v 1.15 2008/07/31 08:45:47 flameeyes Exp $ --> |
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|
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<guide link="/proj/en/qa/asneeded.xml" lang="en"> |
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<title>--as-needed introduction and fixing guide</title> |
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@@ -18,8 +18,8 @@ |
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<!-- See http://creativecommons.org/licenses/by-sa/2.5 --> |
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<license/> |
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|
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-<version>0.8</version> |
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-<date>2007-04-17</date> |
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+<version>0.9</version> |
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+<date>2008-07-31</date> |
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|
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<chapter> <!-- Introduction --> |
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<title>Introduction</title> |
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@@ -149,6 +149,48 @@ |
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|
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</body> |
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</section> |
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+ |
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+<section> |
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+<title>Properly filtering --as-needed</title> |
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+ |
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+<body> |
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+ |
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+<p> |
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+Sometimes it is needed to filter <c>--as-needed</c> as the software is |
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+designed in such a way that it is not fixable to make use of |
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+it. Unfortunately just filtering the flag is often not the best choice |
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+because <path>LDFLAGS</path> can be tricky (they can be concatenated |
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+through commas, making it impossible to filter them out), and because |
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+it is possible to set it as a default through GCC's spec files. |
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+</p> |
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+ |
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+<p> |
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+If you really need to disable the <c>--as-needed</c> behaviour, |
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+because of design choices that conflicts with the way |
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+<c>--as-needed</c> works (and thus not just because the package is |
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+broken, and fixable, when building with <c>--as-needed</c>), what you |
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+should be doing is something along these lines. |
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+</p> |
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+ |
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+<pre caption="correct filter for --as-needed behaviour"> |
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+inherit flag-o-matic |
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+... |
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+ |
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+pkg_setup() { |
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+ append-ldflags -Wl,--no-as-needed |
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+} |
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+</pre> |
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+ |
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+<warn> |
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+Please consider using this filtering <e>only</e> if you know that the |
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+design of the software conflicts with <c>--as-needed</c>. Do not use |
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+this construct if your package simply fails to build after enabling |
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+this behaviour. |
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+</warn> |
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+ |
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+</body> |
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+</section> |
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+ |
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</chapter> |
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|
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<chapter> |
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@@ -174,47 +216,7 @@ |
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|
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</body> |
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</section> |
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-<section> |
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-<title>Binutils bugs</title> |
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-<body> |
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- |
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-<p> |
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-As stated above, the 2.16 binutils series and the early 2.17 prereleases suffer |
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-from problems when linking with <c>--as-needed</c>, which leads to <c>ld</c> |
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-segfaulting when trying to link complex C++ libraries like <path>wxGTK</path>. |
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-</p> |
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|
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-<p> |
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-In this case the first thing to do is to use the latest prerelease available |
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-from upstream. At the date of writing the last prerelease is 2.16.92 that is |
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-said to solve most if not all the problems with <c>--as-needed</c> flag and |
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-does not fail anymore with <path>wxGTK</path> for once. |
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-</p> |
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- |
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-<p> |
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-If the last snapshot doesn't work, you might consider filtering the flag with |
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-the following code, after reporting the case upstream with as many details |
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-possible. |
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-</p> |
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- |
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-<pre caption="filtering the --as-needed flag in an ebuild"> |
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-inherit flag-o-matic |
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-... |
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- |
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-<stmt>pkg_setup()</stmt> { |
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- <keyword>filter-ldflags</keyword> -Wl,--as-needed --as-needed |
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-} |
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-</pre> |
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- |
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-<impo> |
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-These problems should be gone as of 2.16.92 and thus the filtering is |
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-unnecessary, as anyone using <c>--as-needed</c> and finding segfaults should |
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-simply update binutils. For this reason you might want to do this locally but |
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-you should <e>not</e> commit flags filtering for this reason. |
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-</impo> |
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- |
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-</body> |
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-</section> |
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<section> |
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<title>Failure in compile, unrecognized option</title> |
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<body> |
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