static compilation with sonames without specifying it

genner

Hi all,

I am experiencing a strange behavior. I am compiling a library without passing any static / staticlib option, but apparently it gets statically compiled somehow.

It correctly generates a .so file (I'm on Linux), but when I check it with ldd I see: "statically linked
" as output.

I printed what is written in CONFIG and everything seems correct:

lex yacc debug exceptions depend_includepath testcase_targets import_plugins import_qpa_plugin file_copies qmake_use qt warn_on release link_prl incremental shared plugin_manifest linux unix posix gcc qtc_run debug qml_debug qtc_run c++11 console

If I add other similar libraries and try to link them, I cannot be able to create dynamic libraries in any way.

This is the code:

QT -= gui

TEMPLATE = lib
DEFINES += MY_FIRST_LIBRARY

CONFIG += c++11

DESTDIR = ../lib
MOC_DIR = ../build
OBJECTS_DIR = ../build
TARGET = my_first


DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += \
    first_class.cpp

HEADERS += \
    first_class.h \
    my_first_global.h \

# Default rules for deployment.
unix {
    target.path = /usr/lib
}
!isEmpty(target.path): INSTALLS += target

What's going on in your opinion? any hint on how to debug it ?

Cheers

[EDIT 1]
Some more info: the generated Makefile has following flags:

CFLAGS        = -pipe -O2 -Wall -Wextra -D_REENTRANT -fPIC $(DEFINES)
CXXFLAGS      = -pipe -O2 -std=gnu++1z -Wall -Wextra -D_REENTRANT -fPIC $(DEFINES)
LINK          = g++
LFLAGS        = -Wl,-O1 -Wl,-rpath,/home/genner/Qt/6.3.0/gcc_64/lib -Wl,-rpath-link,/home/genner/Qt/6.3.0/gcc_64/lib -shared -Wl,-soname,libmy_first.so.1
LIBS          = $(SUBLIBS) /home/genner/Qt/6.3.0/gcc_64/lib/libQt6Gui.so /home/genner/Qt/6.3.0/gcc_64/lib/libQt6Core.so -lpthread -lGL

EDIT 2:
The file command tells me this:

libmy_first.so.1.0.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=20250f39bd468b237bfcaac47960d8381f1e5ebe, with debug_info, not stripped

Again, ldd tells me instead:

statically linked

jsulm

@genner What is the target device/OS you're building for? What Qt do you use (is it statically linked?)?

genner

@jsulm target is Linux as well, and I have just installed the last Qt 6.3.0 version without doing anything particular.

genner

Ok, apparently the library did not contain much code. Adding more code it now correctly shows that it is a dynamic library also with ldd.