mirror of https://github.com/mpv-player/mpv
obsoleted by users_against_developers.html
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6086 b3059339-0415-0410-9bf9-f77b7e298cf2
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arpi
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<HTML>
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<HEAD>
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<STYLE>
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.text
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{font-family : Verdana, Arial, Helvetica, sans-serif;
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font-size : 14px;}
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</STYLE>
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</HEAD>
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<BODY BGCOLOR=WHITE>
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<FONT CLASS="text">
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<P>
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<B>Question:</B> What is GCC 2.96 ? I can't find it at the GNU site.
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</P>
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<P>
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<B>Answer:</B> Read the <A HREF="http://gcc.gnu.org/gcc-2.96.html">official answer from GNU GCC team.</A>
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</P>
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<P>
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<B>Question:</B> What is the problem with GCC 2.96 ? And with 3.x ?
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</P>
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<P>
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<B>Answer:</B>
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</P>
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<P>Read in MySQL documentation :</P>
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<P><I>
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Compiler Advisory: Several of our users have reported random crashes and
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table corruption with MySQL binaries compiled with gcc two-dot-nine-six on
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the x86 Linux platform. Although we were unable to duplicate the problems
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ourselves or understand their exact cause, we suspect with a great degree of
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confidence that the problem was compiler related. Replacing the faulty binary
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with our binary always eliminated the problem.
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</I></P>
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<P>
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And for the people who periodically ask what the exact problems with
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gcc 2.96 are, my answer: <I>We don't know exactly.</I>
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There were various problems and new problems / bugs come up periodically.
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It is <I>not a single bug/problem</I>. We just see various bug reports, mostly
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gcc internal bugs, compiler syntax errors in source or bad code compiled. They
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are all solved by using a different version of gcc. I understand that gcc 2.96
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has different default optimization flags and they conflict with our inline
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asm code, but we can't fix them, and we really don't want to fix them as they
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work with other compilers or gcc versions, and the fix may cause speed loss.
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</P>
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<P>
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I think that gcc 2.96 should be fixed to be option-compatible with other
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releases, but Red Hat guys refused to do it. If someone is interested - ask
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Eugene K., avifile author, he has a long mailing with them, because they had
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the same problems with avifile. Finally he changed avifile source to
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<I>work around</I> gcc 2.96 bugs...
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We simply have no interest and time to do it.
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</P>
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<P>
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Ah, and about the pipe-in-comment bug: it wasn't really our bug.
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I've talked to one of the gcc maintainers, and he told me that gcc 2.96 and 3.x
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support Intel asm syntax, and it caused the pipe bug. But it <I>is</I> a bug,
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because gcc <I>silently</I>, without any warning, ignored the whole asm block!
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</P>
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<P>
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Other gcc 3.x problems come from a broken libstdc++ or glibc header (std_*.h)
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installation. They are not our fault. MPlayer compiles and works well with
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gcc 2.95.3 (<B>MEncoder</B> won't work with 2.95.2 because it miscompiles
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some MMX instructions). <B>2.96 and 3.0.x are broken</B>, but it depends on
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many environment elements, including gcc 2.96 release number, enabled mplayer
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features, etc. <I>If it works for you using gcc 2.96, it doesn't mean it will
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work for everyone.</I>
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</P>
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<P><B>Answer 2:</B></P>
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<P>
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Also read <A HREF="users_against_developers.html">this</A> text !!!</P>
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<P>
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<B>Question:</B> No! You are wrong! Everything works with gcc 2.96 <I>but</I> MPlayer !
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</P>
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<P>
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<B>Answer:</B>
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</P>
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<P>
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No. You are wrong!
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Several projects (mostly those which contain highly optimized inline asm code)
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had problems with gcc 2.96, for example: avifile, MESA / DRI, Wine, ffmpeg,
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lame, NuppelVideo, MySQL. But other projects already worked around gcc bugs
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(changed code which triggered compiler bugs) so they work for now.
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</P>
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<P>
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<B>Question:</B> No! You are wrong! Everything works with gcc 2.96 <I>including</I> MPlayer .
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</P>
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<P>
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<B>Answer:</B>
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</P>
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Good. Be happy. But you must know, it depends on many environment
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elements, including gcc 2.96 release number, enabled mplayer features, etc.
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<I>If it works for you using gcc 2.96, it doesn't mean it will work for everyone!</I>
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It only means that you are lucky, until you find a problem. But don't forget the
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<B>No.1 rule of gcc 2.96 users: NEVER REPORT BUGS OR PROBLEMS IF YOU ARE USING GCC 2.96</B> !
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<P>
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<B>Question:</B> OK. Understood. But I want to give it a try... how to compile with gcc 2.96?
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</P>
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<P>
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<B>Answer:</B> Really? Are you sure? OK. You know... here it is: ./configure --disable-gcc-checking
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</P>
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<P>
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<B>Question:</B> No! I don't agree with you, because ...
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</P>
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<P>
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<B>Answer:</B> It doesn't matter. Keep your comments to yourself. We're not interested in gcc 2.96 stories.
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</P>
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</FONT>
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</BODY>
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</HTML>
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