Install qt 5.6.1 x86 in platform CentOS7.0 x64

[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.