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I've been trying to get the provided example code running on Ubuntu 20.04, but I'm struggling to get the linking working. I'm new to compiling from source, so I'm hoping that there's a straightforward solution to this!
I initialised the repository using:
git clone https://github.com/OpenKinect/libfreenect.git
cd libfreenect
mkdir build
cd build
sudo cmake -L ..
sudo make
sudo make install
sudo ldconfig /usr/local/lib/
Then when I try to run code from the examples folder it compiles just fine, but fails to build and I get linker errors. Trying to build tiltdemo.c gives:
/usr/bin/ld: /tmp/ccSAoLJq.o: in function `main':
tiltdemo.c:(.text+0xbe): undefined reference to `freenect_sync_set_led'
/usr/bin/ld: tiltdemo.c:(.text+0xd6): undefined reference to `freenect_sync_set_tilt_degs'
/usr/bin/ld: tiltdemo.c:(.text+0xf0): undefined reference to `freenect_sync_get_tilt_state'
/usr/bin/ld: tiltdemo.c:(.text+0x111): undefined reference to `freenect_get_mks_accel'
/usr/bin/ld: link errors found, deleting executable `tiltdemo'
collect2: error: ld returned 1 exit status
Compilation failed.
This is especially confusing because when I run the linker in verbose mode, it's clear that the linker is looking in /usr/local/lib/. I've also verified that the functions with an undefined reference error are contained in the libfreenect_sync.so file in that directory by using 'nm'.
Any help is greatly appreciated!
Here is the output of running the linker in verbose mode.
gcc -Wall -L/usr/local/lib -o "tiltdemo" "tiltdemo.c" -Xlinker --verbose (in directory: /home/user/Documents/ROS_car_project/Kinect controls)
GNU ld (GNU Binutils for Ubuntu) 2.34
Supported emulations:
elf_x86_64
elf32_x86_64
elf_i386
elf_iamcu
elf_l1om
elf_k1om
i386pep
i386pe
using internal linker script:
==================================================
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attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/crtbeginS.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/9/crtbeginS.o
attempt to open /tmp/ccSAoLJq.o succeeded
/tmp/ccSAoLJq.o
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/usr/bin/ld: /tmp/ccSAoLJq.o: in function `main':
tiltdemo.c:(.text+0xbe): undefined reference to `freenect_sync_set_led'
/usr/bin/ld: tiltdemo.c:(.text+0xd6): undefined reference to `freenect_sync_set_tilt_degs'
/usr/bin/ld: tiltdemo.c:(.text+0xf0): undefined reference to `freenect_sync_get_tilt_state'
/usr/bin/ld: tiltdemo.c:(.text+0x111): undefined reference to `freenect_get_mks_accel'
/usr/bin/ld: link errors found, deleting executable `tiltdemo'
collect2: error: ld returned 1 exit status
Compilation failed.
The text was updated successfully, but these errors were encountered:
I've been trying to get the provided example code running on Ubuntu 20.04, but I'm struggling to get the linking working. I'm new to compiling from source, so I'm hoping that there's a straightforward solution to this!
I initialised the repository using:
Then when I try to run code from the examples folder it compiles just fine, but fails to build and I get linker errors. Trying to build tiltdemo.c gives:
This is especially confusing because when I run the linker in verbose mode, it's clear that the linker is looking in
/usr/local/lib/. I've also verified that the functions with an undefined reference error are contained in the libfreenect_sync.so file in that directory by using 'nm'.Any help is greatly appreciated!
Here is the output of running the linker in verbose mode.
gcc -Wall -L/usr/local/lib -o "tiltdemo" "tiltdemo.c" -Xlinker --verbose (in directory: /home/user/Documents/ROS_car_project/Kinect controls) GNU ld (GNU Binutils for Ubuntu) 2.34 Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu elf_l1om elf_k1om i386pep i386pe using internal linker script: ================================================== /* Script for -pie -z combreloc -z separate-code -z relro -z now */ /* Copyright (C) 2014-2020 Free Software Foundation, Inc. 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/usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a succeeded /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a attempt to open /usr/local/lib/libgcc_s.so failed attempt to open /usr/local/lib/libgcc_s.a failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so succeeded opened script file /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so opened script file /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so attempt to open libgcc_s.so.1 failed attempt to open /usr/local/lib/libgcc_s.so.1 failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so.1 failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgcc_s.so.1 succeeded /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgcc_s.so.1 attempt to open /usr/local/lib/libgcc.so failed attempt to open /usr/local/lib/libgcc.a failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.so failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a succeeded /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a attempt to open /usr/local/lib/libc.so failed attempt to open /usr/local/lib/libc.a failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libc.so failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libc.a failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libc.so succeeded opened script file /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libc.so /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libc.so opened script file /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libc.so attempt to open /lib/x86_64-linux-gnu/libc.so.6 succeeded /lib/x86_64-linux-gnu/libc.so.6 attempt to open /usr/lib/x86_64-linux-gnu/libc_nonshared.a succeeded /usr/lib/x86_64-linux-gnu/libc_nonshared.a (/usr/lib/x86_64-linux-gnu/libc_nonshared.a)elf-init.oS attempt to open /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 succeeded /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 /usr/lib/x86_64-linux-gnu/libc_nonshared.a /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 attempt to open /usr/local/lib/libgcc.so failed attempt to open /usr/local/lib/libgcc.a failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.so failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a succeeded /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a attempt to open /usr/local/lib/libgcc_s.so failed attempt to open /usr/local/lib/libgcc_s.a failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so succeeded opened script file /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so opened script file /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so attempt to open libgcc_s.so.1 failed attempt to open /usr/local/lib/libgcc_s.so.1 failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc_s.so.1 failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgcc_s.so.1 succeeded /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgcc_s.so.1 attempt to open /usr/local/lib/libgcc.so failed attempt to open /usr/local/lib/libgcc.a failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.so failed attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a succeeded /usr/lib/gcc/x86_64-linux-gnu/9/libgcc.a attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/crtendS.o succeeded /usr/lib/gcc/x86_64-linux-gnu/9/crtendS.o attempt to open /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/crtn.o succeeded /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/crtn.o ld-linux-x86-64.so.2 needed by /lib/x86_64-linux-gnu/libc.so.6 found ld-linux-x86-64.so.2 at /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 /usr/bin/ld: /tmp/ccSAoLJq.o: in function `main': tiltdemo.c:(.text+0xbe): undefined reference to `freenect_sync_set_led' /usr/bin/ld: tiltdemo.c:(.text+0xd6): undefined reference to `freenect_sync_set_tilt_degs' /usr/bin/ld: tiltdemo.c:(.text+0xf0): undefined reference to `freenect_sync_get_tilt_state' /usr/bin/ld: tiltdemo.c:(.text+0x111): undefined reference to `freenect_get_mks_accel' /usr/bin/ld: link errors found, deleting executable `tiltdemo' collect2: error: ld returned 1 exit status Compilation failed.The text was updated successfully, but these errors were encountered: