cannot find -li2c

[SA7BNT]

Hallo,
can some one help me with that issue?? Where do i get the lib´s, or how can i install the missing lib´s?
Running Debian 9 on Raspi3.

pi@raspberrypi:/ArduiPi_OLED $ sudo make
g++ -Wall -fPIC -fno-rtti -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -c ArduiPi_OLED.cpp
ArduiPi_OLED.cpp: In member function ‘void ArduiPi_OLED::putSeedChar(char)’:
ArduiPi_OLED.cpp:635:41: warning: array subscript has type ‘char’ [-Wchar-subscripts]
char bit1=( seedfont[C-32][i] >> j) & 0x01;
^
In file included from ArduiPi_OLED.cpp:36:0:
./ArduiPi_OLED_lib.h: At global scope:
./ArduiPi_OLED_lib.h:58:21: warning: ‘oled_type_str’ defined but not used [-Wunused-variable]
static const char * oled_type_str[] = {
^
g++ -Wall -fPIC -fno-rtti -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -c Adafruit_GFX.cpp
In file included from Adafruit_GFX.cpp:26:0:
./ArduiPi_OLED_lib.h:58:21: warning: ‘oled_type_str’ defined but not used [-Wunused-variable]
static const char * oled_type_str[] = {
^
gcc -Wall -fPIC -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -c bcm2835.c
gcc -Wall -fPIC -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -c Wrapper.cpp
Wrapper.cpp: In function ‘int16_t Wrapper_DisplayWidth()’:
Wrapper.cpp:233:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^
Wrapper.cpp: In function ‘int16_t Wrapper_DisplayHeight()’:
Wrapper.cpp:238:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^
In file included from Wrapper.cpp:39:0:
./ArduiPi_OLED_lib.h: At global scope:
./ArduiPi_OLED_lib.h:58:21: warning: ‘oled_type_str’ defined but not used [-Wunused-variable]
static const char * oled_type_str[] = {
^
g++ -shared -Wl,-soname,libArduiPi_OLED.so.1 -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -o libArduiPi_OLED.so.1.0 ArduiPi_OLED.o Adafruit_GFX.o bcm2835.o Wrapper.o -li2c
/usr/bin/ld: cannot find -li2c
collect2: error: ld returned 1 exit status
Makefile:54: recipe for target 'ArduiPi_OLED' failed
make: *** [ArduiPi_OLED] Error 1
pi@raspberrypi:/ArduiPi_OLED $

[kraeml]

Same here on Debian 9 and Pi3+ and Pi2.

...
/usr/bin/ld: cannot find -li2c
collect2: error: ld returned 1 exit status
Makefile:54: recipe for target 'ArduiPi_OLED' failed
make: *** [ArduiPi_OLED] Error 1

Thanks for this project.

[SA7BNT]

Thats works for me.

Install:
http://ftp.us.debian.org/debian/pool/main/i/i2c-tools/libi2c0_4.0-2_armhf.deb
http://ftp.us.debian.org/debian/pool/main/i/i2c-tools/libi2c-dev_4.0-2_armhf.deb
http://ftp.us.debian.org/debian/pool/main/i/i2c-tools/i2c-tools_4.0-2_armhf.deb

Those should work then.

[kraeml]

Thanks this works. And I have to change my OS into raspbian stretch not Debian 9.

[PaulSlocum]

This fix worked for me too on Raspbian Stretch LIte

[PaulDFoster]

@PaulSlocum newbie here, I can't make this work on Raspbian Stretch Lite. My i2cdetect and other tools now give me illegal instruction when executed. How or what .deb should I have installed? I used the @SA7BNT files...

[PaulSlocum]

I installed the three above that @SA7BNT posted. Not sure what the difference could be, but my display is working work the library well now.

[PaulDFoster]

I'm using a Pi Zero W. But attempting to use the armel rather than armhf has the same illegal instruction result.

[w1msg]

I am also getting an illegal function from the program I use that accesses the Oled. But only on a Pi Zero W ..

[brodyUW]

Found a simple work around, posted below.

Not very experienced here, but I have been fighting this same issue for quite a few hours over the past week. Every time I ran "sudo make" in the main folder, Makefile would exit with an error on line 54: ld can't find -li2c. I am running Raspbian Lite Stretch on RPi Zero W. I tried installing the deb packages recommended above, but also got the "illegal instruction" error on execution.

Not sure what changed, but invoking -li2c with g++ in the Makefile should link to libi2c.so or libi2c.a; however, after installing libi2c-dev via apt, no such library exists. bcm2835.c has the following line: "#include <linux/i2c-dev.h>". I am assuming with -li2c, ld should be able to find that header file, but it can't. So I simply modified the main Makefile by removing -li2c and using the -I option to specify the location and file to include. Everything now compiles and the I2C OLED examples work perfectly.

Again you are looking for line 54 in the main Makefile. Below I have posted line 53 and 54. I commented out the -li2c flag and added the -I option. I hope this works for everybody else.

ArduiPi_OLED: ArduiPi_OLED.o Adafruit_GFX.o bcm2835.o Wrapper.o
        $(CXX) -shared -Wl,-soname,$(LIB).so.1 $(CFLAGS) $(LDFLAGS)  -o ${LIBNAME} $^ -I:/usr/include/linux/i2c-dev.h #-li2c

[kd8bxp]

@brodyUW Thank you for the work around -
I might add to your instructions DO NOT install the above .deb files - they just caused problems for me
running a full install of Stretch on a RPi Zero W - but now I have a working display. Thank you.

[brodyUW]

@kd8bxp You are welcome! It was very frustrating, but I suppose a valuable learning experience. Good point on the .deb files.

[PauleBertt]

@brodyUW thanks fixed this for me!!

[ayaromenok]

@brodyUW

I commented out the -li2c flag and added the -I option. I hope this works for everybody else.

Commenting missing i2c lib for linker is enough to build a lib and install it.

You don't need to add include path to compiler with -I since it's already used by preprocessor/compiler

[edwingioflo13]

@ayaromenok
How did you solve it?

I did what you mentioned @brodyUW but I had these errors:

gcc ArduiPi_OLED.o Adafruit_GFX.o bcm2835.o Wrapper.o -o ArduiPi_OLED
/usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/crt1.o: En la función _start': (.text+0x34): referencia a main' sin definir
ArduiPi_OLED.o: En la función ArduiPi_OLED::~ArduiPi_OLED()': ArduiPi_OLED.cpp:(.text._ZN12ArduiPi_OLEDD0Ev[_ZN12ArduiPi_OLEDD5Ev]+0xc): referencia a operator delete(void*, unsigned int)' sin definir

[brodyUW]

@brodyUW

I commented out the -li2c flag and added the -I option. I hope this works for everybody else.

Commenting missing i2c lib for linker is enough to build a lib and install it.

You don't need to add include path to compiler with -I since it's already used by preprocessor/compiler

Good catch. Thanks!