Install qt 5.6.1 x86 in platform CentOS7.0 x64

fighter

gmake executed normally. But qt 32bit header files cannot find in the disk, instead of 64bit header files have been found(for example, qconfig-32.h did not exist in the disk, instead qconfig-64.h was found in the disk. )I don't know the reason. Can anyone help me?
Thank you. The following is my installation steps:

yum install libgcc-4.8.5-11.el7.i686
yum install libstdc++-4.8.5-11.el7.i686
yum install glibc-devel.i686
yum install openssl-devel.i686
../qt-source/configure -prefix /opt/Qt5.6.1 -platform linux-g++-32 -no-compile-examples
gmake
gmake install

SGaist

Hi and welcome to devnet,

@fighter said in Install qt 5.6.1 x86 in platform CentOS7.0 x64:

The reason of select 5.6.1 is my Windows project use 5.6.1 x86 32bit. Now I want to transplant Windows project to Linux project, so I select 5.6.1.

Out of curiosity, is it mandatory to build your application for 32bit on Linux ? The fact that you used a 32bit Qt on Windows doesn't make it mandatory to also build your application in 32bit on other platforms.

fighter

@SGaist Thank you for your reply.
In fact my application have 32bit and 64bit version in Windows. Windows QT version is
qt_5.6.1-1_x86, qt_5.6.2_x64.
So in Linux I also want 32bit and 64bit version.

jsulm

@fighter You can check whether built Qt libraries are 32bit or 64 bit like this (in a terminal):

$ file PATH_TO_QT/lib/libQt5Core.so

If libQt5Core.so is a symbolic link then just use the file it points to.

fighter

@jsulm Thank you for your reply.

[root@localhost ~]# find / -name "libQt5Core.so"
/home/fighter/qt-build/qtbase/lib/libQt5Core.so
/usr/lib64/libQt5Core.so
/opt/Qt5.6.1/lib/libQt5Core.so

[root@localhost ~]# file /usr/lib64/libQt5Core.so.5.6.1
/usr/lib64/libQt5Core.so.5.6.1: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), BuildID[sha1]=b148d33ba6c8e59e0a1 61ff2a0c2af35ee42ad6c, stripped

[root@localhost ~]# file /opt/Qt5.6.1/lib/libQt5Core.so.5.6.1
/opt/Qt5.6.1/lib/libQt5Core.so.5.6.1: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), BuildID[sha1]=2434bdcd 1cc892d42e5ff1ba772a48237a8a3e66, stripped

jsulm

@fighter said in Install qt 5.6.1 x86 in platform CentOS7.0 x64:

/opt/Qt5.6.1/lib/libQt5Core.so.5.6.1

is a 32bit binary

fighter

@jsulm Yes. /opt/Qt5.6.1/lib/libQt5Core.so.5.6.1 is 32bit. But it is strange that qconfig-32.h
did not exist in the disk, instead qconfig-64.h was found in the disk.

jsulm

@fighter said in Install qt 5.6.1 x86 in platform CentOS7.0 x64:

qconfig-32.h

The file is actually called qconfig.h

fighter

@jsulm said in Install qt 5.6.1 x86 in platform CentOS7.0 x64:

qconfig.h
The content of qconfig.h have qconfig-32.h and qconfig-64.h. Please look at the following:

[root@localhost ~]# ls -l /usr/include/QtCore/qconfig.h
lrwxrwxrwx. 1 root root 18 Jul 21 17:01 /usr/include/QtCore/qconfig.h -> qconfig-multilib.h
[root@localhost ~]# cat /usr/include/QtCore/qconfig-multilib.h
/* qconfig.h */
/* This file is here to prevent a file conflict on multiarch systems.  A
 * conflict will occur because qconfig.h has arch-specific definitions.
 *
 * DO NOT INCLUDE THE NEW FILE DIRECTLY -- ALWAYS INCLUDE THIS ONE INSTEAD. */

#ifndef QCONFIG_MULTILIB_H
#define QCONFIG_MULTILIB_H
#include <bits/wordsize.h>

#if __WORDSIZE == 32
#include "QtCore/qconfig-32.h"
#elif __WORDSIZE == 64
#include "QtCore/qconfig-64.h"
#else
#error "unexpected value for __WORDSIZE macro"
#endif

#endif

jsulm

@fighter said in Install qt 5.6.1 x86 in platform CentOS7.0 x64:

/usr/include/QtCore/qconfig-multilib.h

This header file is not from your own build which is in /opt/Qt5.6.1
Same for /usr/include/QtCore/qconfig.h

fighter

@jsulm
You mean I should use my own build header file in /opt/Qt5.6.1?

The file /usr/include /QtCore/qconfig.h is a link to qconfig-multilib.h.
The size of /usr/include /QtCore/qconfig-multilib.h is not same with /opt/Qt5.6.1/include/QtCore/qconfig.h.
[root@localhost ~]# ls -l /opt/Qt5.6.1/include/QtCore/qconfig.h
-rw-r--r--. 1 root root 4339 Jul 25 16:41 /opt/Qt5.6.1/include/QtCore/qconfig.h
[root@localhost ~]# ls -l /usr/include/QtCore/qconfig-multilib.h
-rw-r--r--. 1 root root 501 Nov 5 2016 /usr/include/QtCore/qconfig-multilib.h

jsulm

@fighter If you want to use your build then yes you need to use the header files from your build. How else should it work?
/opt/Qt5.6.1/include/QtCore/qconfig.h is not a link, so nothing is missing.

fighter

@jsulm
Thank you for your patient reply. Thank you very much.