Qt 4.1.2 Fails to build on Linux

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.

I guess here's the solution:

Quote:

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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.

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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).

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

Code:

---

foo :: foo (args)

---

you need to type

Code:

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foo (args)

---

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.

Quote:

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Originally Posted by rohandhruva

gcc 4.1 is that it doesnt allow

Code:

---

foo :: foo (args)

---

you need to type

Code:

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foo (args)

---

---

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

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

Code:

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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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Quote:

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Originally Posted by rohandhruva

Is there any gcc 4.1 patch for Qt 4.1.2 available ?

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

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

Code:

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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 ?

Quote:

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Originally Posted by rohandhruva

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

Code:

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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 !

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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:

Quote:

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

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

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 ?