Qt 4.1.2 Fails to build on Linux

[rohandhruva]

Hello,

I use Arch Linux and Frugalware Linux. I have built and installed Qt 4.1.1 open source edition on arch linux. It worked perfectly.

However trying to compile Qt 4.1.2 fails with this error :

network/q3dns.cpp: In constructor 'Q3DnsAnswer::Q3DnsAnswer(Q3DnsQuery*)':
network/q3dns.cpp:267: internal compiler error: Segmentation fault

It is the first time I have seen the compiler segfault. Arch has gcc 4.0.3 and frugalware has gcc 4.1. Both give the same error. I have posted the error here :

http://aur.archlinux.org/packages.ph...phans=0&SeB=nd

My comment is the last one, and the person above me too has the same type of error. I have confirmed one more person cannot compile it, and yet one more who can. Which is still confusing .. is it a random error ?

The buildscript I use is this -- http://aur.archlinux.org/packages/qt4/qt4/PKGBUILD

Basically I use this script because it helps me make a package for my distribution. Please help me, and post your results, and any suggestions.
Since this is a p3 550mhz 256mb ram, it compiles very slow, and hence it may take some time before I can post my results.

Thanks.

[jacek]

I guess here's the solution:

Comment by: shastry on 20060310 [10:32:31]
Hmm a compiler error. are you using stuff from testing ? (the new gcc/glibc combo may be?)
Compiles fine using current... for everyone..
If you are using testing stuff, try downgrading to current and give it a shot.

Comment by: UnrealX on 20060310 [12:25:09]
Downgraded to current and everything went fine. Thanks for this package again.

I use GCC 3.3.6 on my system (PLD Linux) and everything compiles fine. I've tried GCC 4.x once and got random internal compiler errors (AFAIR I was using Qt 3 at that time).

[rohandhruva]

Arch current contains gcc 4.0.3 and glibc 2.3.6, so shastry's comment is not longer valid. Also, the same system compiled and ran Qt 4.1.1 fine. I am posting that error message from gcc 4.1 based frugalware, though. The problem with gcc 4.1 is that it doesnt allow

foo :: foo (args)

foo :: foo (args)

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you need to type

foo (args)

foo (args)

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I experienced the same problem while compiling knemo, but the compiled didnt segfault at that time. Is there any gcc 4.1 patch for Qt 4.1.2 available ?

Rohan.

[jacek]

gcc 4.1 is that it doesnt allow

foo :: foo (args)

foo :: foo (args)

To copy to clipboard, switch view to plain text mode 

you need to type

foo (args)

foo (args)

To copy to clipboard, switch view to plain text mode 

Well... that's really weird. A new kind of C++?

Q3DnsAnswer::Q3DnsAnswer() looks like any other constructor --- there's nothing special about it:

Q3DnsAnswer::Q3DnsAnswer( Q3DnsQuery * query_ )
{
    ok = true;
 
    answer = 0;
    size = 0;
    query = query_;
    pp = 0;
    rrs = new Q3PtrList<Q3DnsRR>;
    rrs->setAutoDelete( false );
    next = size;
    ttl = 0;
    label.clear();
    rr = 0;
 
    Q3DnsRR * newrr = new Q3DnsRR( query->l );
    newrr->t = query->t;
    newrr->deleteTime = query->started + 10;
    newrr->expireTime = query->started + 10;
    newrr->nxdomain = true;
    newrr->current = true;
    rrs->append( newrr );
}

Q3DnsAnswer::Q3DnsAnswer( Q3DnsQuery * query_ )
{
    ok = true;

    answer = 0;
    size = 0;
    query = query_;
    pp = 0;
    rrs = new Q3PtrList<Q3DnsRR>;
    rrs->setAutoDelete( false );
    next = size;
    ttl = 0;
    label.clear();
    rr = 0;

    Q3DnsRR * newrr = new Q3DnsRR( query->l );
    newrr->t = query->t;
    newrr->deleteTime = query->started + 10;
    newrr->expireTime = query->started + 10;
    newrr->nxdomain = true;
    newrr->current = true;
    rrs->append( newrr );
}

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Is there any gcc 4.1 patch for Qt 4.1.2 available ?

I don't think so. IMO it is better to use a more reliable version of GCC, instead of changing the code.

[rohandhruva]

Yes, I agree patching is not good. Now yet another person on gentoo reported it compiles just fine with gcc 4.1 , though

USE="cups gif jpeg opengl png zlib -accessibility -debug -doc -examples -fire bird -mng -mysql -nas -nis -odbc -postgres -sqlite -xinerama"

USE="cups gif jpeg opengl png zlib -accessibility -debug -doc -examples -fire bird -mng -mysql -nas -nis -odbc -postgres -sqlite -xinerama"

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meaning that he disabled so much of qt4 !
Any more brainstorms please ?

[jacek]

Now yet another person on gentoo reported it compiles just fine with gcc 4.1 , though

USE="cups gif jpeg opengl png zlib -accessibility -debug -doc -examples -fire bird -mng -mysql -nas -nis -odbc -postgres -sqlite -xinerama"

USE="cups gif jpeg opengl png zlib -accessibility -debug -doc -examples -fire bird -mng -mysql -nas -nis -odbc -postgres -sqlite -xinerama"

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meaning that he disabled so much of qt4 !

The biggest difference is that the debug mode was disabled. AFAIR by default Qt is built in both debug and release mode. Did you try passing "-release" option to the configure utility?

I found this line in the PKGBUILD file:

sed -i "s|read acceptance|acceptance=yes|" configure

Why don't you use "-confirm-license" instead?

[rohandhruva]

Ok, i will try passing only -release instead of enabling debug. Also, that PKGBUILD i provided is "shastry"'s now my own, so I am sorry I didnt read ./configure -help fully I will use accept-licence from now on !

Will post my results ASAP, but it will take about 7 hours to compile, so please keep giving more suggestions !

Rohan.

Edit :
1) What difference does enabling / disabling debug make ? I am very new to qt, and I wanted to start off from learning qt4, not qt3.

2) Is 'libtool-slay' proper for qt4 ? i.e. delete all .la files found in the package.

3) Is it recomended to change the official qt CFLAGS ? Since arch and frugalware define their own cflags. However you can see shastry has sed'ed a bit to get qt4 follow them. Is that problematic ?