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Building Qt 4.8.0 on Redhat linux

  • Hi,
    I am trying to build Qt4.8.0 on Redhat linux5.4.

    I get following error, while building. It seems that it is related to webkit

    cd JavaScriptCore/ && gmake -f Makefile.WebKit
    gmake[2]: Entering directory /scratch/vnarveka/Qt_built/qt-everywhere-opensource-src-4.8.0/src/3rdparty/webkit/Source/JavaScriptCore' g++ -c -m64 -pipe -Wall -Wextra -Wreturn-type -fno-strict-aliasing -Wcast-align -Wchar-subscripts -Wformat-security -Wreturn-type -Wno-unused-parameter -Wno-sign-compare -Wno-switch -Wno-switch-enum -Wundef -Wmissing-noreturn -Winit-self -Werror -fno-stack-protector -O3 -fvisibility=hidden -fvisibility-inlines-hidden -fPIC -D_REENTRANT -DNDEBUG -DBUILDING_QT__=1 -DNDEBUG -DQT_ASCII_CAST_WARNINGS -DBUILDING_JavaScriptCore -DBUILDING_WTF -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_HAVE_SSE3 -DQT_HAVE_SSSE3 -DQT_SHARED -I../../../../../mkspecs/linux-g++-64 -I. -I../../../../../include/QtCore -I../../../../../include -I. -I../../Source -I../ThirdParty -Iassembler -Ibytecode -Ibytecompiler -Iheap -Idfg -Idebugger -Iinterpreter -Ijit -Iparser -Iprofiler -Iruntime -Iwtf -Iwtf/gobject -I/scratch/vnarveka/Qt_built/qt-everywhere-opensource-src-4.8.0/src/3rdparty/webkit/Source/JavaScriptCore/wtf/symbian -Iwtf/unicode -Iyarr -IAPI -IForwardingHeaders -Igenerated -I../../Source -I../../include -I/include/QtWebKit -I/include -I.moc/release-static -o .obj/release-static/YarrInterpreter.o yarr/YarrInterpreter.cpp cc1plus: warnings being treated as errors ./wtf/PassOwnPtr.h: In instantiation of 'WTF::PassOwnPtr<JSC::Yarr::ByteDisjunction>': yarr/YarrInterpreter.h:328: instantiated from here ./wtf/PassOwnPtr.h:81: warning: lowering visibility of 'WTF::PassOwnPtr<U> WTF::adoptPtr(U*) [with U = U, T = JSC::Yarr::ByteDisjunction]' to match its type ./wtf/PassOwnPtr.h: In instantiation of 'WTF::PassOwnPtr<JSC::Yarr::BytecodePattern>': yarr/YarrInterpreter.cpp:1451: instantiated from here ./wtf/PassOwnPtr.h:81: warning: lowering visibility of 'WTF::PassOwnPtr<U> WTF::adoptPtr(U*) [with U = U, T = JSC::Yarr::BytecodePattern]' to match its type gmake[2]: *** [.obj/release-static/YarrInterpreter.o] Error 1 gmake[2]: Leaving directory/scratch/vnarveka/Qt_built/qt-everywhere-opensource-src-4.8.0/src/3rdparty/webkit/Source/JavaScriptCore'
    gmake[1]: *** [sub-JavaScriptCore-JavaScriptCore-pro-make_default-ordered] Error 2
    gmake[1]: Leaving directory `/scratch/vnarveka/Qt_built/qt-everywhere-opensource-src-4.8.0/src/3rdparty/webkit/Source'
    gmake: *** [sub-webkit-make_default-ordered] Error 2

    Has anyone faced such a problem ? I had also tried building Qt4.6.4, which builds properly without any error.

    Thank you for any help


  • Do you need WebKit? If not, you can add the configure flag -no-webkit, and Qt will be compiled without WebKit, hopefully avoiding the problem.

  • bq. cc1plus: warnings being treated as errors

    You can try to delete -Werror flag from Makefile in /scratchvnarveka/Qt_built/qt-everywhere-opensource-src-4.8.0/src/3rdparty/webkitSource/JavaScriptCore folder

  • Hello ludde and AcerExtensa,

    Thanks a lot for responding.

    @ ludde - I have already tried with -no-webkit option, while I was waiting for someone to reply here, and the builds were successful. I was just wondering If I am missing some prerequisites, because of which, I am getting build error in the standard Qt package.

    @AcerExtensa -i will definitely give a try, to your suggestion

  • Dear all,

    I have the same problem. However, I need webkit. How do I do to past the error? I can not find -Werror in /scratchvnarveka/Qt_built/qt-everywhere-opensource-src-4.8.0/src/3rdparty/webkitSource/JavaScriptCore folder.

    Thanks all

  • bq. cc1plus: warnings being treated as errors

    It's definitely Werror flag somewhere. search for it:
    @grep -r "Werror" /path/to/qt/3rdpart/webkit/dir@

    You also can try to disable this warning:

    bq. warning: lowering visibility of

    add -fpermessive to Project Makefile. or a better way, add
    @QMAKE_CXXFLAGS = -fpermissive@
    to Qt you also need to clean config and rerun configure.

    Where is many way to diagnose and switch warnings in gcc. Read "this":

  • Dear AcerExtensa,

    Thanks! I will try it

    Best regards,

  • Dear AcerExtensa,

    I search for it using
    grep -r "Werror" ./src/3rdparty/webkit

    I just found QMAKE_CXXFLAGS += -Werror in Wenkit.pri .I remove it to configure and make. I got the errror as

    So, is there anything I miss?

  • Which version of gcc do you have?

    can you post output of following cmd:
    @gcc -v@

  • Are you cross-compiling QT for mobile device?

    bq. ./wtf/MathExtras.h:252: error: ‘std::isfinite’ has not been declared

    Problem can be old gcc version, or <cmath> is not included.

  • Yes. I use cross-compiling Qt for arm device.

    1. My Deshtop PC OS:Ubuntu 10.10
    2. Toolchian: arm-2007q1-10-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar
    3. I modify qt-everywhere-opensource-arc-4.8.0/mkspecs/qws/linux-arm-g++/qmake.conf as below:

    #qmake configuration for building with arm-linux-g++

    #modifications to g++.conf
    QMAKE_CC = /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-gcc
    QMAKE_CXX = /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-g++
    QMAKE_LFLAGS = -Wl,-rpath=/home/tslib/lib
    QMAKE_LINK = /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-g++
    QMAKE_LINK_SHLIB = /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-guneabi-g++
    #modifications to linux.conf
    QMAKE_AR = /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-ar cqs
    QMAKE_OBJCOPY = /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-objcopy
    QMAKE_STRIP = /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-strip

    QMAKE_INCDIR = /home/tslib/include
    QMAKE_LIBDIR = /home/tslib/lib


    1. qt4.8.0 download from

    2. My configure line: ./configure -prefix PATH -embedded arm -make tools -xplatform qws/linux-arm-g++ -v -qt-mouse-tslib -I’tslib PATH’/include -L’tslib PATH’/lib -qt-gfx-vnc

    3. gcc -v shows
      gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)

    Thank you!

  • Ok, what does following cmd says:
    bq. /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-gcc -v

    cross-compiling Qt is always tricky...

    look in wtf/MathExtras.h file in webkit dir and ensure what <cmath> is included if not include it
    @#include <cmath>@

    recompile and post next compiler error...

  • /usr/local/toolchain/arm-2007q1/bin/arm-none-linux-gnueabi-gcc -v
    shows 4.2.0 20070413 (prerelease) (CodeSourcery Sourcery G++ Lite 2007q1-10)

    Yes. wtf/MathExtras.h has already included
    #include <cmath>

  • can you try to compile it with at least 4.5.2 cross compiled gcc version?

  • Dear AcerExtensa,

    I'm trying it. Wish i works.



  • Dear AcerExtensa,

    I use arm-none-linux-gnueabi-gcc -v 4.6.1. I works. Thank you so much.


  • Happy for you :) , have fun ;)

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