Ubuntu recognizes executable as shared library and

I am first experiencing this issue on my fresh installation of lubuntu 17.04. I have used to use Ubuntu before and I hadn't this issue before.

I compiled my qt application and I can execute it through command line by issuing with "./". However, I can't execute it by clicking on file manager (neither PCManFM, Nautilus...) Both recognizes it as shared library file type.

How can I run it by clicking directly on the file?

this is what happens when I double-click the executable through file manager:

build-log:

11:20:05: Running steps for project APP_release...
11:20:05: Configuration unchanged, skipping qmake step.
11:20:05: Starting: "/usr/bin/make" 
/opt/Qt5.9.0/5.9/gcc_64/bin/uic ../APP_release/mainwindow.ui -o ui_mainwindow.h
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../APP_release -I. -I/opt/Qt5.9.0/5.9/gcc_64/include -I/opt/Qt5.9.0/5.9/gcc_64/include/QtWidgets -I/opt/Qt5.9.0/5.9/gcc_64/include/QtGui -I/opt/Qt5.9.0/5.9/gcc_64/include/QtCore -I. -isystem /usr/include/libdrm -I. -I/opt/Qt5.9.0/5.9/gcc_64/mkspecs/linux-g++ -o main.o ../APP_release/main.cpp
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../APP_release -I. -I/opt/Qt5.9.0/5.9/gcc_64/include -I/opt/Qt5.9.0/5.9/gcc_64/include/QtWidgets -I/opt/Qt5.9.0/5.9/gcc_64/include/QtGui -I/opt/Qt5.9.0/5.9/gcc_64/include/QtCore -I. -isystem /usr/include/libdrm -I. -I/opt/Qt5.9.0/5.9/gcc_64/mkspecs/linux-g++ -o mainwindow.o ../APP_release/mainwindow.cpp
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../APP_release -I. -I/opt/Qt5.9.0/5.9/gcc_64/include -I/opt/Qt5.9.0/5.9/gcc_64/include/QtWidgets -I/opt/Qt5.9.0/5.9/gcc_64/include/QtGui -I/opt/Qt5.9.0/5.9/gcc_64/include/QtCore -I. -isystem /usr/include/libdrm -I. -I/opt/Qt5.9.0/5.9/gcc_64/mkspecs/linux-g++ -o foldercompressor.o ../APP_release/foldercompressor.cpp
g++ -pipe -O2 -Wall -W -dM -E -o moc_predefs.h /opt/Qt5.9.0/5.9/gcc_64/mkspecs/features/data/dummy.cpp
/opt/Qt5.9.0/5.9/gcc_64/bin/moc -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB --include ./moc_predefs.h -I/opt/Qt5.9.0/5.9/gcc_64/mkspecs/linux-g++ -I/home/spectrum/trunk/APP_release/APP_release -I/opt/Qt5.9.0/5.9/gcc_64/include -I/opt/Qt5.9.0/5.9/gcc_64/include/QtWidgets -I/opt/Qt5.9.0/5.9/gcc_64/include/QtGui -I/opt/Qt5.9.0/5.9/gcc_64/include/QtCore -I. -I/usr/include/c++/6 -I/usr/include/x86_64-linux-gnu/c++/6 -I/usr/include/c++/6/backward -I/usr/lib/gcc/x86_64-linux-gnu/6/include -I/usr/local/include -I/usr/lib/gcc/x86_64-linux-gnu/6/include-fixed -I/usr/include/x86_64-linux-gnu -I/usr/include ../APP_release/mainwindow.h -o moc_mainwindow.cpp
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../APP_release -I. -I/opt/Qt5.9.0/5.9/gcc_64/include -I/opt/Qt5.9.0/5.9/gcc_64/include/QtWidgets -I/opt/Qt5.9.0/5.9/gcc_64/include/QtGui -I/opt/Qt5.9.0/5.9/gcc_64/include/QtCore -I. -isystem /usr/include/libdrm -I. -I/opt/Qt5.9.0/5.9/gcc_64/mkspecs/linux-g++ -o moc_mainwindow.o moc_mainwindow.cpp
/opt/Qt5.9.0/5.9/gcc_64/bin/moc -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB --include ./moc_predefs.h -I/opt/Qt5.9.0/5.9/gcc_64/mkspecs/linux-g++ -I/home/spectrum/trunk/APP_release/APP_release -I/opt/Qt5.9.0/5.9/gcc_64/include -I/opt/Qt5.9.0/5.9/gcc_64/include/QtWidgets -I/opt/Qt5.9.0/5.9/gcc_64/include/QtGui -I/opt/Qt5.9.0/5.9/gcc_64/include/QtCore -I. -I/usr/include/c++/6 -I/usr/include/x86_64-linux-gnu/c++/6 -I/usr/include/c++/6/backward -I/usr/lib/gcc/x86_64-linux-gnu/6/include -I/usr/local/include -I/usr/lib/gcc/x86_64-linux-gnu/6/include-fixed -I/usr/include/x86_64-linux-gnu -I/usr/include ../APP_release/foldercompressor.h -o moc_foldercompressor.cpp
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../APP_release -I. -I/opt/Qt5.9.0/5.9/gcc_64/include -I/opt/Qt5.9.0/5.9/gcc_64/include/QtWidgets -I/opt/Qt5.9.0/5.9/gcc_64/include/QtGui -I/opt/Qt5.9.0/5.9/gcc_64/include/QtCore -I. -isystem /usr/include/libdrm -I. -I/opt/Qt5.9.0/5.9/gcc_64/mkspecs/linux-g++ -o moc_foldercompressor.o moc_foldercompressor.cpp
g++ -Wl,-O1 -Wl,-rpath,/opt/Qt5.9.0/5.9/gcc_64/lib -o APP_release main.o mainwindow.o foldercompressor.o moc_mainwindow.o moc_foldercompressor.o   -L/opt/Qt5.9.0/5.9/gcc_64/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread 
11:20:10: The process "/usr/bin/make" exited normally.
11:20:10: Elapsed time: 00:05

回答1:

I have fixed this behavior by adding the following line on my project's .pro file in QT:

QMAKE_LFLAGS += -no-pie

The behavior is occurring because newer ubuntu distros set GCC default link flag -pie, which marks e_type as ET_DYN on the binary file. Consequently, the Operating System recognizes as Shared Library.

To work around it, it may be necessary to add -no-pie on compiler option.

回答2:

What does "file APP_release" say on the command line. The "file" program should say what the system thinks the file is. Executables have "...LSB executable" and shared libraries "...LSB shared object". If it says it is an executable then it appears to be a bug in Ubuntu. If it says it is a shared object then your make log suggests it is a bug in the linker!