Linkage against libQt5Core

问题:

I installed Qt5.4 with the online installer (working on ubuntu 14). I'm trying to compile my c++ source and link against libQt5Core but ld throw an error:

make g++ -Wall test.o Party.o Communication.o FileParser.o PeerConnection.o ServerModule.o Utilities.o -o party -g -L/home/bush/Qt/5.4/gcc_64/lib -L/usr/lib/x86_64-linux-gnu/ -lQt5Core -lboost_system -lpthread /usr/bin/ld: warning: libicui18n.so.53, needed by /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libicuuc.so.53, needed by /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so, not found (try using -rpath or -rpath-link) /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_setMillis_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_fromUnicode_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_get_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_inDaylightTime_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_open_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_countAvailable_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_countAliases_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `u_errorName_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_openCountryTimeZones_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `u_strToUpper_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_getDefaultName_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `uenum_next_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucol_strcoll_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_getMaxCharSize_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_getAvailableName_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucol_open_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_getTimeZoneDisplayName_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_toUnicode_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `uenum_close_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucol_getSortKey_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_getAlias_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_close_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucol_setAttribute_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_close_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_openTimeZoneIDEnumeration_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_openTimeZones_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_getStandardName_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucol_close_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_compareNames_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_clone_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `u_strToLower_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_getDefaultTimeZone_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_open_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucnv_setSubstChars_53' /home/bush/Qt/5.4/gcc_64/lib/libQt5Core.so: undefined reference to `ucal_getDSTSavings_53' collect2: error: ld returned 1 exit status make: *** [party] Error 1 

My makefile is:

CPPFLAGS=-g -c --std=c++0x -I/usr/include -I/home/bush/Qt/5.4/gcc_64/include -I/home/bush/Qt/5.4/gcc_64/include/QtCore -I/usr/include/boost LDFLAGS=-g -L/home/bush/Qt/5.4/gcc_64/lib -L/usr/lib/x86_64-linux-gnu/ -lQt5Core -lboost_system -lpthread  all:party  party:test.o Party.o Communication.o FileParser.o PeerConnection.o ServerModule.o Utilities.o     g++ -Wall $^ -o party $(LDFLAGS)  test.o:test.cpp     g++ $(CPPFLAGS) test.cpp Party.o:Party.cpp     g++ $(CPPFLAGS) Party.cpp Communication.o:Communication.cpp     g++ $(CPPFLAGS) Communication.cpp FileParser.o:FileParser.cpp     g++ -fPIC $(CPPFLAGS) FileParser.cpp PeerConnection.o:PeerConnection.cpp     g++ $(CPPFLAGS) PeerConnection.cpp ServerModule.o:ServerModule.cpp     g++ $(CPPFLAGS) ServerModule.cpp Utilities.o:Utilities.cpp     g++ $(CPPFLAGS) Utilities.cpp 

回答1:

I came across the same problem. but I find my way out just by this code.

export  LD_LIBRARY_PATH=/usr/local/Qt/5.5/gcc_64/lib:$LD_LIBRARY_PATH 

回答2:

I get such errors when I was trying to build my project under Debian 8 (with libicu52 from official repository) from QtCreator. I solved it by changing 'Environment' for my Qt Kit (5.8.0) to: LD_LIBRARY_PATH=/opt/Qt/5.8/gcc_64/lib:${LD_LIBRARY_PATH}.

Screenshot: Changes marked by red line

回答3:

In my case it worked after I made 3 symbolic links. The lib was installed but I had a newer version (55) than the one expected (54).

sudo ln -s /usr/local/Qt/5.5/gcc_64/lib/libicui18n.so.54 /usr/lib/x86_64-linux-gnu/libicui18n.so.54 sudo ln -s /usr/local/Qt/5.5/gcc_64/lib/libicuuc.so.54 /usr/lib/x86_64-linux-gnu/libicuuc.so.54 sudo ln -s /usr/local/Qt/5.5/gcc_64/lib/libicudata.so.54 /usr/lib/x86_64-linux-gnu/libicudata.so.54 

回答4:

I get this error when I was trying to build Iris under Ubuntu. I solved it by removing CONFIG += static from the .pro file

回答5:

Try to add -licuuc to the LDFLAGS of the makefile.

sudo apt-get install libicu-dev

文章来源: Linkage against libQt5Core