Cross-compile of Qt 5.9.1 source for beaglebone black

[koahnig]

I am trying to cross-compile Qt on Ubuntu 64 bit in a VM for beaglebone black using gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf

The recent Qt code 5.9.1 is downloaded in tar.xz and unzipped. When starting configure and answering a couple of questionsI ran into following issue (config.log):

Command line: -release -opengl es2 -device linux-beagleboard-g++ -device-option CROSS_COMPILE=/home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- -sysroot ../linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -prefix /usr/local/qtcc
executing config test verifyspec
+ cd /home/me/qt-everywhere-opensource-src-5.9.1/config.tests/common/verifyspec && /home/me/qt-everywhere-opensource-src-5.9.1/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared use_gold_linker console single_arch" "QMAKE_CFLAGS += --sysroot=../linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" "QMAKE_CXXFLAGS += --sysroot=../linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" "QMAKE_LFLAGS += --sysroot=../linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" -early "CONFIG += cross_compile" /home/me/qt-everywhere-opensource-src-5.9.1/qtbase/config.tests/common/verifyspec
+ cd /home/me/qt-everywhere-opensource-src-5.9.1/config.tests/common/verifyspec && MAKEFLAGS= /usr/bin/make clean && MAKEFLAGS= /usr/bin/make
> rm -f verifyspec.o
> rm -f *~ core *.core
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -c -pipe -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -mfloat-abi=hard --sysroot=../linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -O2 -O3 -Wall -W -fPIC  -I/home/me/qt-everywhere-opensource-src-5.9.1/qtbase/config.tests/common/verifyspec -I. -I/home/me/qt-everywhere-opensource-src-5.9.1/qtbase/mkspecs/devices/linux-beagleboard-g++ -o verifyspec.o /home/me/qt-everywhere-opensource-src-5.9.1/qtbase/config.tests/common/verifyspec/verifyspec.cpp
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -mfloat-abi=hard --sysroot=../linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -Wl,-O1 -fuse-ld=gold -o verifyspec verifyspec.o   -lrt -lpthread -ldl
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot open crt1.o: No such file or directory
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot open crti.o: No such file or directory
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot open crtn.o: No such file or directory
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lrt
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lpthread
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -ldl
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lm
> /home/me/linaro/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lc
> collect2: error: ld returned 1 exit status
> Makefile:66: recipe for target 'verifyspec' failed
> make: *** [verifyspec] Error 1

Some of the flags are not supported,but even object files are missing.

Any suggestions?

[sierdzio]

I've never compiled for BBB, but on raspberry there is a problem with the gold linker and the output looks similar (if I recall well). Maybe it is also better to disable it in your case. You can do it by passing -no-use-gold-linker to configure.

[koahnig]

@sierdzio

Thanks for reply.

Unfortunately, I have a problem with my desktop, which did not boot anymore. I have to wait for it coming back from repair. :(

[sierdzio]

Uh, OK. Good luck!

[koahnig]

@sierdzio

I have activated my old machine even though it is damn slow.

Also by using the parameter -no-use-gold-linker, I got basically the same problem.

Command line: -device linux-beagleboard-g++ -device-option CROSS_COMPILE=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- -sysroot /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -prefix /usr/local/qtcc -no-use-gold-linker
executing config test machineTuple
+ /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -dumpmachine
> arm-linux-gnueabihf
test config.qtbase.tests.machineTuple succeeded
executing config test verifyspec
+ cd /home/me/qt-everywhere-opensource-src-5.9.1/config.tests/common/verifyspec && /home/me/qt-everywhere-opensource-src-5.9.1/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared console single_arch" "QMAKE_CFLAGS += --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" "QMAKE_CXXFLAGS += --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" "QMAKE_LFLAGS += --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" -early "CONFIG += cross_compile" /home/me/qt-everywhere-opensource-src-5.9.1/qtbase/config.tests/common/verifyspec
+ cd /home/me/qt-everywhere-opensource-src-5.9.1/config.tests/common/verifyspec && MAKEFLAGS= /usr/bin/make
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -c -pipe -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -mfloat-abi=hard --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -O2 -O3 -Wall -W -fPIC  -I/home/me/qt-everywhere-opensource-src-5.9.1/qtbase/config.tests/common/verifyspec -I. -I/home/me/qt-everywhere-opensource-src-5.9.1/qtbase/mkspecs/devices/linux-beagleboard-g++ -o verifyspec.o /home/me/qt-everywhere-opensource-src-5.9.1/qtbase/config.tests/common/verifyspec/verifyspec.cpp
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -mfloat-abi=hard --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -Wl,-O1 -o verifyspec verifyspec.o   -lrt -lpthread -ldl 
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find crt1.o: No such file or directory
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find crti.o: No such file or directory
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lrt
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lpthread
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -ldl
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lm
> collect2: error: ld returned 1 exit status
> Makefile:66: recipe for target 'verifyspec' failed
> make: *** [verifyspec] Error 1

There are problems with the link parameters, but the essential issues are the missing object files crt1.o and crti.o according to the output

[koahnig]

Just found out that I still used Qt 5.9.1 source which was downloaded a day prior to storing Qt 5.9.2 to the archives.

However, also Qt 5.9.2 fails in qmake.

Command line: -device linux-beagleboard-g++ -device-option CROSS_COMPILE=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- -sysroot /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -prefix /usr/local/qtcc
executing config test use_gold_linker
+ cd /home/me/qt-everywhere-opensource-src-5.9.2/config.tests && /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -fuse-ld=gold -o conftest-out conftest.cpp
test config.qtbase.tests.use_gold_linker succeeded
executing config test machineTuple
+ /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -dumpmachine
> arm-linux-gnueabihf
test config.qtbase.tests.machineTuple succeeded
executing config test verifyspec
+ cd /home/me/qt-everywhere-opensource-src-5.9.2/config.tests/verifyspec && /home/me/qt-everywhere-opensource-src-5.9.2/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared use_gold_linker warn_off console single_arch" "QMAKE_CFLAGS += --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" "QMAKE_CXXFLAGS += --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" "QMAKE_LFLAGS += --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf" -early "CONFIG += cross_compile" /home/me/qt-everywhere-opensource-src-5.9.2/qtbase/config.tests/verifyspec
+ cd /home/me/qt-everywhere-opensource-src-5.9.2/config.tests/verifyspec && MAKEFLAGS= /usr/bin/make
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -c -pipe -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb -mfloat-abi=hard --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -O2 -O3 -w -fPIC  -I/home/me/qt-everywhere-opensource-src-5.9.2/qtbase/config.tests/verifyspec -I. -I/home/me/qt-everywhere-opensource-src-5.9.2/qtbase/mkspecs/devices/linux-beagleboard-g++ -o verifyspec.o /home/me/qt-everywhere-opensource-src-5.9.2/qtbase/config.tests/verifyspec/verifyspec.cpp
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -mfloat-abi=hard --sysroot=/home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf -Wl,-O1 -fuse-ld=gold -o verifyspec verifyspec.o   -lrt -lpthread -ldl 
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot open crt1.o: No such file or directory
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot open crti.o: No such file or directory
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot open crtn.o: No such file or directory
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lrt
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lpthread
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -ldl
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lm
> /home/me/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lc
> collect2: error: ld returned 1 exit status
> Makefile:66: recipe for target 'verifyspec' failed
> make: *** [verifyspec] Error 1

This time a third object crtn.o is missing as well.

[sierdzio]

Are you sure your toolchain is valid? It complains about crt, pthread etc. - pretty basic stuff. Try compiling a minimal C++ program with that toolchain to verify whether it works or not.

[koahnig]

@sierdzio

I did compile a "hello world", because I had the same doubts. The hello world did compile and link.

In the mean time I went back to past version of Qt 5.4.2 for checking.

• I do not need most recent Qtr anyhow
• merely a check if it has an issue with 32 bit in new Qt libs

The configure with Qt 5.4.2 shows even more details and I saw complains about stl-headers and the real basic C++ includes such as stdio.h and so on.

Apparently the include path setting is wrong. I am not sure how this is handled. Is this set for configure with -sysroot parameter?

[sierdzio]

Yes, sysroot tells the compiler where to look for usual paths lke /usr/include, /usr/libs etc. But since your hello world compiles with same sysroot, it should be OK.

Check out the mkspecs, maybe it is wrong. You can find mkspecs in the folder of the same name in Qt source tree.

[koahnig]

I had checked the toolchain with my previous installation which is gone with the crash of my desktop. Therefore, I cannot check anymore.

However, the toolchain for cross-compilation on my current installation is broken.