Yocto libc linker error while building application

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Yocto libc linker error while building application

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bharathg
Contributor I

Board: imx6qsabresd

host: ubuntu 12.04

FS: yocto project 1.5 (Dora)

Description:

     When i try to compile application using poky toolchain installed via meta-toolchain, i am getting below linker errors. Please let me know how can i fix this

ERROR Log:

-------------------

/opt/poky/1.4.3/sysroots/i686-pokysdk-linux/usr/libexec/armv7a-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.7.2/ld: cannot find /lib/libc.so.6

/opt/poky/1.4.3/sysroots/i686-pokysdk-linux/usr/libexec/armv7a-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.7.2/ld: cannot find /usr/lib/libc_nonshared.a

/opt/poky/1.4.3/sysroots/i686-pokysdk-linux/usr/libexec/armv7a-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.7.2/ld: cannot find /lib/ld-linux-armhf.so.3

collect2: error: ld returned 1 exit status

Also,

While building multi-threaded gstreamer application, we are getting pthread linker errors as shown below:

ERROR Log:

-------------------

/opt/poky/1.4.3/sysroots/i686-pokysdk-linux/usr/libexec/armv7a-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.7.2/ld: cannot find /lib/libpthread.so.0

/opt/poky/1.4.3/sysroots/i686-pokysdk-linux/usr/libexec/armv7a-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.7.2/ld: cannot find /usr/lib/libpthread_nonshared.a

collect2: error: ld returned 1 exit status

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bharathg
Contributor I

Below is my code test.c:

-----------------------------------

#include <pthread.h>

#include <stdio.h>

/* this function is run by the second thread */

void *inc_x(void *x_void_ptr)

{

/* increment x to 100 */

int *x_ptr = (int *)x_void_ptr;

while(++(*x_ptr) < 100);

printf("x increment finished\n");

/* the function must return something - NULL will do */

return NULL;

}

int main()

{

int x = 0, y = 0;

/* show the initial values of x and y */

printf("x: %d, y: %d\n", x, y);

/* this variable is our reference to the second thread */

pthread_t inc_x_thread;

/* create a second thread which executes inc_x(&x) */

if(pthread_create(&inc_x_thread, NULL, inc_x, &x)) {

fprintf(stderr, "Error creating thread\n");

return 1;

}

/* increment y to 100 in the first thread */

while(++y < 100);

printf("y increment finished\n");

/* wait for the second thread to finish */

if(pthread_join(inc_x_thread, NULL)) {

fprintf(stderr, "Error joining thread\n");

return 2;

}

/* show the results - x is now 100 thanks to the second thread */

printf("x: %d, y: %d\n", x, y);

return 0;

}

Command used to build:

-----------------------------------

/opt/poky/1.4.3/sysroots/i686-pokysdk-linux/usr/bin/armv7a-vfp-neon-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -L/opt/fsl-imx6-sysroot/lib -L/opt/fsl-imx6-sysroot/usr/lib -lpthread test.c

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LeonardoSandova
Specialist I

are you sourcing the environment script before compilation? the env script should be located somewhere on /opt/poky/<VERSION>/environment-setup-cortexa9hf-vfp-neon-poky-linux-gnueabi

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sumanranjan
Contributor III

Hi Leonardo,

I am getting this error too when I try to compile GStreamer Sample Application. I did source the environment script.I am able to compile and run a HelloWorld.c Application.

Sample application is from Chapter 10. Your first application link. The makefile I am using is attached below,

Makefile:

------------------------------------------------------------------------------------------------------------------------------------

# define the C compiler to use

CC = /opt/poky/1.4+snapshot/sysroots/i686-pokysdk-linux/usr/bin/cortexa9hf-vfp-neon-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc

# define any compile-time flags

CFLAGS = -Wall -g

# define any directories containing header files other than /usr/include

INCLUDES = -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/glib-2.0 -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/lib/glib-2.0/include/ -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/gstreamer-0.10/ -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/libxml2

LFLAGS = -L/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/lib

# define any libraries to link into executable:

LIBS = -lglib-2.0 -lxml2 -lgstreamer-0.10 -lgobject-2.0 -lz -lgmodule-2.0 -lffi

# define the C source files

SRCS = hellogst.c

# define the C object files

OBJS = $(SRCS:.c=.o)

# define the executable file

MAIN = hellogst

.PHONY: depend clean

all:    $(MAIN)

        @echo  Simple compiler named simple has been compiled

$(MAIN): $(OBJS)

        $(CC) $(CFLAGS) $(INCLUDES) -o $(MAIN) $(OBJS) $(LFLAGS) $(LIBS)

# this is a suffix replacement rule for building .o's from .c's

.c.o:

        $(CC) $(CFLAGS) $(INCLUDES) -c $<  -o $@

clean:

        $(RM) *.o *~ $(MAIN)

depend: $(SRCS)

        makedepend $(INCLUDES) $^

------------------------------------------------------------------------------------------------------------------------------------

Compilation Error:

------------------------------

$ make

/opt/poky/1.4+snapshot/sysroots/i686-pokysdk-linux/usr/bin/cortexa9hf-vfp-neon-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -Wall -g -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/glib-2.0 -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/lib/glib-2.0/include/ -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/gstreamer-0.10/ -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/libxml2 -c hellogst.c  -o hellogst.o

/opt/poky/1.4+snapshot/sysroots/i686-pokysdk-linux/usr/bin/cortexa9hf-vfp-neon-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -Wall -g -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/glib-2.0 -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/lib/glib-2.0/include/ -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/gstreamer-0.10/ -I/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/include/libxml2 -o hellogst hellogst.o -L/home/suman/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd/usr/lib -lglib-2.0 -lxml2 -lgstreamer-0.10 -lgobject-2.0 -lz -lgmodule-2.0 -lffi

/opt/poky/1.4+snapshot/sysroots/i686-pokysdk-linux/usr/libexec/cortexa9hf-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.8.1/ld: cannot find /lib/libc.so.6

/opt/poky/1.4+snapshot/sysroots/i686-pokysdk-linux/usr/libexec/cortexa9hf-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.8.1/ld: cannot find /usr/lib/libc_nonshared.a

/opt/poky/1.4+snapshot/sysroots/i686-pokysdk-linux/usr/libexec/cortexa9hf-vfp-neon-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.8.1/ld: cannot find /lib/ld-linux-armhf.so.3

collect2: error: ld returned 1 exit status

make: *** [hellogst] Error 1

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sumanranjan
Contributor III

This issue has been resolved after manually editing the libpthread.so and libc.so file generated during yocto build. These files point to /usr/lib i.e. host pc libraries instead of current directory[/build-fb/tmp/sysroots/imx6qsabresd/usr/lib] which was causing the problem.

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ieio
Contributor IV

Hi  Suman Ranjan,

what do u mean with "manualy editing libpthread.so and libc.so file"? Using an hex editor.

I am running exactly into your same problem.

What is strange is that I can successfully compile QT applications with qt creator following the instruction in  Setup QT Creator with Yocto Build

Thanks in advance,

i.

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ieio
Contributor IV

Solved,

my problem was in the Makefile, pls refer to 5.2. of  Yocto Project Application Developer's Guide

CC and CFLAGS must be set properly.

i.

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sumanranjan
Contributor III

You are right. I changed my CFLAGS accordingly and it worked too.

Makefile:

SYSROOT_PATH=/home/suman/svndump/fsl-community-bsp/build-fb/tmp/sysroots/imx6qsabresd

# define any compile-time flags

#CFLAGS  = -fPIC -Wall -Wextra -O2 -g  # old CFLAG

CFLAGS="--sysroot=$(SYSROOT_PATH)"  # New CFLAG fixes the problem