The problem is I struggle to make the Autotools work with my C program. I am stuck getting the errors "undefined reference to...".
I work on Ubuntu 20.04.1 LTS.
I am using:
- Xml glade file
- Css file
- stdlib.h
- gtk/gtk.h (v3)
- glib.h
- stdbool.h
The hierarchy is:
main.c
Makefile.am
configure.ac
/src
structures.h
/features
timer.c
timer.h
/frontend
frontend.c
frontend.h
style.css
view.glade
/signals
options.c
options.h
timer_buttons.c
timer_buttons.h
I successfully compile the program using:
gcc-9 `pkg-config --cflags gtk+-3.0` -o main main.c `pkg-config --libs gtk+-3.0` -rdynamic -g -Wall
It’s when I want to make a makefile using the autotools that I need a bit of help.
Configure.ac
AC_INIT([main], [0.1])
AM_INIT_AUTOMAKE([foreign subdir-objects -Wall])
AC_PROG_CC
AC_CONFIG_FILES([Makefile])
PKG_CHECK_MODULES([GTK], ["gtk+-3.0"])
AC_OUTPUT
Makefile.am
bin_PROGRAMS = main
main_SOURCES = main.c
main_CPPFLAGS = $(GTK_CFLAGS)
main_LDFLAGS = $(GTK_LIBS)
Then I do the following:
autoconf
automake
./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking whether make supports the include directive... yes (GNU style)
checking dependency style of gcc... gcc3
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for GTK... yes
checking that generated files are newer than configure... done
configure: creating ./config.status
config.status: creating Makefile
config.status: executing depfiles commands
make
gcc -g -O2 -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -o main main-main.o
/usr/bin/ld: main-main.o: in function `run_timer':
/home/myname/Desktop/project/src/features/timer.c:46: undefined reference to `gtk_label_get_type'
/usr/bin/ld: /home/myname/Desktop/project/src/features/timer.c:46: undefined reference to `g_type_check_instance_cast'
/usr/bin/ld: /home/myname/Desktop/project/src/features/timer.c:46: undefined reference to `gtk_label_set_text'
/usr/bin/ld: main-main.o: in function `stick_checkbox_signal':
/home/myname/Desktop/project/src/signals/options.c:6: undefined reference to `gtk_toggle_button_get_active'
/usr/bin/ld: main-main.o: in function `start_signal':
/home/myname/Desktop/project/src/signals/timer_buttons.c:11: undefined reference to `g_timeout_add'
/usr/bin/ld: main-main.o: in function `pause_signal':
/home/myname/Desktop/project/src/signals/timer_buttons.c:17: undefined reference to `g_source_remove'
/usr/bin/ld: main-main.o: in function `reset_signal':
/home/myname/Desktop/project/src/signals/timer_buttons.c:26: undefined reference to `g_source_remove'
###
etc.............
###
collect2: error: ld returned 1 exit status
make: *** [Makefile:364: main] Error 1
You can see that I get these "undefined reference to..." errors. How do I make it work? I have been looking this up on internet quite a lot but I'm stuck here.
