when execute qt app ， " make " occure error .

[The most recent future]

HI ALL :

qmake -project ...
.......
make

log :

cc@ubuntu:/usr/local/Qt-5.2.0/lib$ sudo make
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/arm-linux-gnueabihf-g++ -Wl,-O1 -o lib hello.o -lQt5Widgets -L/usr/lib/i386-linux-gnu -lQt5Gui -lQt5Core -lGL -lpthread
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: skipping incompatible /usr/lib/i386-linux-gnu/libQt5Widgets.so when searching for -lQt5Widgets
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lQt5Widgets
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: skipping incompatible /usr/lib/i386-linux-gnu/libQt5Gui.so when searching for -lQt5Gui
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lQt5Gui
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: skipping incompatible /usr/lib/i386-linux-gnu/libQt5Core.so when searching for -lQt5Core
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lQt5Core
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: skipping incompatible /usr/lib/i386-linux-gnu/libGL.so when searching for -lGL
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lGL
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: skipping incompatible /usr/lib/i386-linux-gnu/libpthread.so when searching for -lpthread
/usr/local/arm/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../lib/gcc/arm-linux-gnueabihf/4.9.2/../../../../arm-linux-gnueabihf/bin/ld: skipping incompatible /usr/lib/i386-linux-gnu/libpthread.a when searching for -lpthread
collect2: error: ld returned 1 exit status
make: *** [lib] Error 1

thanks !

[JKSH]

@The-most-recent-future said in when execute qt app ， " make " occure error .:

arm-linux-gnueabihf

This refers to toolchains/libraries that target the ARM architecture (for embedded devicecs)

i386-linux-gnu

This refers to toolchains/libraries that target the x86 architecture (for desktop PCs)

======
Your issue is this: You are calling an ARM compiler, but it is finding x86 libraries. They are not compatible

Are you trying to compile for your desktop, or for an embedded device?

[The most recent future]

@JKSH
thanks.
for embedded device.

[jsulm]

@The-most-recent-future Then link against ARM libraries not x86.
Also: why do you build as root (sudo make)?!
This is completely unnecessary and dangerous.

[The most recent future]

@jsulm
thanks！

[The most recent future]

@jsulm
Compiler success 【make and make install no error 】, how to verify correct

[jsulm]

@The-most-recent-future How to verify? Run it on the target device...

[The most recent future]

@jsulm
how to run?

qmake -v :
Using Qt version 5.2.1 in /usr/lib/i386-linux-gnu
????
my Qt version is 5.2.0 , cross compile version is arm-linux-g++ ,not i386 ..............
why ?

[jsulm]

@The-most-recent-future I don't understand: you just said that you built successfully? So: did you built or not?
Which qmake did you use? You need to use qmake from your crosscompiled Qt, not the one from your x86 host Qt.
"qmake -v" - this is your host x86 qmake, use the one from crosscompiled Qt (use complete path to it).

[JKSH]

@The-most-recent-future said in when execute qt app ， " make " occure error .:

qmake -v :
Using Qt version 5.2.1 in /usr/lib/i386-linux-gnu

This means, when you call qmake from the console, you are calling the x86 qmake.

@The-most-recent-future said in when execute qt app ， " make " occure error .:

qmake -project ...

You are calling the x86 qmake. That's why you got errors.

You need to call your ARM qmake instead.

[SGaist]

Hi,

To add to @JKSH and @jsulm : use the full path to the qmake executable you want to use when you're working with the command line.