QT5 build errors with arm tool chain (Cross Compiling)

srav219

Hi,
I was trying to configure qt5 with the following options
"./configure -prefix $(qt_embedded_install_dir) -opensource -openssl -platform linux-g++ -xplatform linux-wr-arm-g++"
linux-g++ -- is present in ../qtbase/mkspecs
linux-wr-arm-g++ --- I have created

I am seeing build errors at compilaton of src/tools code (i.e uic,moc)

The build errors are as follows

g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fno-exceptions -fPIE -DQT_NO_LIBUDEV -DQT_NO_XCB -DQDOC2_COMPAT -DQT_NO_DEBUG -DQT_BOOTSTRAP_LIB -DQT_BOOTSTRAPPED -DQT_LITE_UNICODE -DQT_NO_CAST_TO_ASCII -DQT_NO_CODECS -DQT_NO_DATASTREAM -DQT_NO_LIBRARY -DQT_NO_QOBJECT -DQT_NO_SYSTEMLOCALE -DQT_NO_THREAD -DQT_NO_UNICODETABLES -DQT_NO_USING_NAMESPACE -DQT_NO_DEPRECATED -DQT_NO_TRANSLATION -DQT_QMAKE_LOCATION="/home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-
......
arm-wrs-linux-gnueabi-armv6jel-glibc_small-ld -Wl,-O1 -o ../../../bin/qdoc .obj/release-shared/atom.o .obj/release-shared/codechunk.o .obj/release-shared/codemarker.o .obj/release-shared/codeparser.o .obj/release-shared/config.o .obj/release-shared/cppcodemarker.o .obj/release-shared/cppcodeparser.o .obj/release-shared/ditaxmlgenerator.o .obj/release-shared/doc.o .obj/release-shared/editdistance.o .obj/release-shared/generator.o .obj/release-shared/helpprojectwriter.o .obj/release-shared/htmlgenerator.o .obj/release-shared/location.o .obj/release-shared/main.o .obj/release-shared/node.o .obj/release-shared/openedlist.o .obj/release-shared/plaincodemarker.o .obj/release-shared/puredocparser.o .obj/release-shared/qdocdatabase.o .obj/release-shared/qdoctagfiles.o .obj/release-shared/qdocindexfiles.o .obj/release-shared/quoter.o .obj/release-shared/separator.o .obj/release-shared/text.o .obj/release-shared/tokenizer.o .obj/release-shared/tree.o .obj/release-shared/yyindent.o .obj/release-shared/qcryptographichash.o .obj/release-shared/qqmljsast.o .obj/release-shared/qqmljsastvisitor.o .obj/release-shared/qqmljsengine_p.o .obj/release-shared/qqmljsgrammar.o .obj/release-shared/qqmljslexer.o .obj/release-shared/qqmljsparser.o .obj/release-shared/jscodemarker.o .obj/release-shared/qmlcodemarker.o .obj/release-shared/qmlcodeparser.o .obj/release-shared/qmlmarkupvisitor.o .obj/release-shared/qmlvisitor.o -L/home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build/qt-everywhere-opensource-src-5.0.0/qtbase/lib -lQt5Bootstrap -lz -lpthread
arm-wrs-linux-gnueabi-ld: unrecognized option '-Wl,-O1'
arm-wrs-linux-gnueabi-ld: use the --help option for usage information
make[7]: *** [../../../bin/qdoc] Error 1
make[7]: Leaving directory /home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build/qt-everywhere-opensource-src-5.0.0/qtbase/src/tools/qdoc' make[6]: *** [sub-qdoc-make_first] Error 2 make[6]: Leaving directory /home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build/qt-everywhere-opensource-src-5.0.0/qtbase/src/tools'
make[5]: *** [sub-tools-make_first] Error 2
make[5]: Leaving directory /home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build/qt-everywhere-opensource-src-5.0.0/qtbase/src' make[4]: *** [sub-src-make_first] Error 2 make[4]: Leaving directory /home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build/qt-everywhere-opensource-src-5.0.0/qtbase'
make[3]: *** [module-qtbase-make_first] Error 2
make[3]: Leaving directory /home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build/qt-everywhere-opensource-src-5.0.0' make[2]: *** [qt-embedded.compile] Error 2 make[2]: Leaving directory /home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build'
make[1]: *** [qt-embedded.buildlogger] Error 2
make[1]: Leaving directory `/home/psravan/sravan/codebase/qtalpha/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build'
make: *** [all] Error 2

I dont know why arm-wrs-linux-gnueabi-armv6jel-glibc_small-ld is used in place of g++ while linking the tools.
I compared the build with qt 4.7.4 ,g++ is involved in linking the tools code in case of qt 4.7.4
Can any one help me in this regard

srav219

The cross toolchain used is as follows
The code for linux-wr-arm-g++ is as follows

+MAKEFILE_GENERATOR = UNIX
+TARGET_PLATFORM = unix
+TEMPLATE = app
+CONFIG += qt warn_on release incremental link_prl gdb_dwarf_index
+QT += core gui
+QMAKE_INCREMENTAL_STYLE = sublib
+include(../common/linux.conf)
+include(../common/gcc-base-unix.conf)
+include(../common/g++-unix.conf)
+QMAKE_CC = /home/psravan/sravan/codebase/QT5/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/host-cross/arm-wrs-linux-gnueabi/x86-linux2/arm-wrs-linux-gnueabi-armv6jel-glibc_small-gcc
+QMAKE_CXX = /home/psravan/sravan/codebase/QT5/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/host-cross/arm-wrs-linux-gnueabi/x86-linux2/arm-wrs-linux-gnueabi-armv6jel-glibc_small-g++
+QMAKE_LINK = /home/psravan/sravan/codebase/QT5/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/host-cross/arm-wrs-linux-gnueabi/x86-linux2/arm-wrs-linux-gnueabi-armv6jel-glibc_small-g++
+QMAKE_LINK_SHLIB = /home/psravan/sravan/codebase/QT5/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/host-cross/arm-wrs-linux-gnueabi/x86-linux2/arm-wrs-linux-gnueabi-armv6jel-glibc_small-g++
+QMAKE_LFLAGS_RPATH =
+# modifications to linux.conf
+QMAKE_AR = /home/psravan/sravan/codebase/QT5/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/host-cross/arm-wrs-linux-gnueabi/x86-linux2/arm-wrs-linux-gnueabi-armv6jel-glibc_small-ar cqs
+QMAKE_OBJCOPY = /home/psravan/sravan/codebase/QT5/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/host-cross/arm-wrs-linux-gnueabi/x86-linux2/arm-wrs-linux-gnueabi-armv6jel-glibc_small-objcopy
+QMAKE_STRIP = /home/psravan/sravan/codebase/QT5/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/host-cross/arm-wrs-linux-gnueabi/x86-linux2/arm-wrs-linux-gnueabi-armv6jel-glibc_small-strip
+load(qt_config)

daliusd

@arm-wrs-linux-gnueabi-ld: unrecognized option ‘-Wl,-O1’@

It should be -Wl -O1 or something like that. Comma is not right separator for command line arguments.

srav219

I agree here for tools compilation ,the arm-wrs-linux-gnueabi-ld is wrong one,it should be host compiler option i.e g++(in this case).I dont know why cross compilation option is coming
if it was g++,then -Wl,O1 would be correct.

daliusd

Are you sure about that:

@$ g++ -Wl,-O1 test.cpp
ld: unknown option: -O1
collect2: ld returned 1 exit status

$ g++ -Wl,O1 test.cpp
ld: file not found: O1
collect2: ld returned 1 exit status@

srav219

I compared the build with qt 4.7.4 which was successful.

the log is

g++ -m32 -Wl,-O1 -o ../../../bin/uic .obj/release-shared-emb-arm/customwidgetsinfo.o .obj/release-shared-emb-arm/databaseinfo.o .obj/release-shared-emb-arm/driver.o .obj/release-shared-emb-arm/treewalker.o .obj/release-shared-emb-arm/ui4.o .obj/release-shared-emb-arm/validator.o .obj/release-shared-emb-arm/cppextractimages.o .obj/release-shared-emb-arm/cppwritedeclaration.o .obj/release-shared-emb-arm/cppwriteicondata.o .obj/release-shared-emb-arm/cppwriteicondeclaration.o .obj/release-shared-emb-arm/cppwriteiconinitialization.o .obj/release-shared-emb-arm/cppwriteincludes.o .obj/release-shared-emb-arm/cppwriteinitialization.o .obj/release-shared-emb-arm/main.o .obj/release-shared-emb-arm/uic.o -L/home/psravan/sravan/codebase/latestbuild/IPPhone/Generated/Build/platform/groupp-glibc_small-armv6jel-wrlinux_3_0/build/qt-everywhere-opensource-src-4.7.4/src/tools/bootstrap -lbootstrap -lz -lz
make[4]: Leaving directory

daliusd

OK. I have looked into "man g++":

@-Wl,option
Pass option as an option to the linker. If option contains commas, it is split into multiple options at the commas.@

Now in successful case you are using g++ that passes -O1 to linker and in unsuccessful case you are using linker (*-ld) directly thus it should simply state -O1 (without -Wl). I would look into spec file, configuration or Makefile for this setting.

srav219

My query is cross compiler linker is used while building the tools.Is configuration (qtbase/configure) wrong

daliusd

Maybe nobody tried to build for your configuration and that's it. I don't know ;-)

pnoffke

I'm having the same problem. I also tried -device instead of/in addition to -xplatform.

And what's even more screwy, when it's building the tools, it's mixing the CFLAGS and LFLAGS between toolchains. For example, my cross compiler doesn't support -m64, so I took that out of my mkspec. But when it's building the tools, it's using my cross-compiler with -m64 (and the build is therefore failing). It's picking up the -m64 from -platform (which is linux-g++-64).

Since I'm cross-compiling for x86_64 on an x86_64 machine, I can work around this by using the same value (my custom mkspec) for -platform and -xplatform.

pnoffke

Take a look at this bug report. Maybe you have some variables set that is confusing the build.

https://bugreports.qt-project.org/browse/QTBUG-31030