I am trying to compile my code for GnuTLS, but on compiling it gives the following errors.
I have checked gnutls.h is present on my system in /usr/include/gnutls/.
What else can be the cause?
gcc -o tls.o tls.c
/tmp/ccfyZ1Bd.o: In function `main':
tls.c:(.text+0x1c): undefined reference to `gnutls_global_init'
tls.c:(.text+0x28): undefined reference to `gnutls_anon_allocate_client_credentials'
tls.c:(.text+0x3c): undefined reference to `gnutls_init'
tls.c:(.text+0x58): undefined reference to `gnutls_priority_set_direct'
tls.c:(.text+0x74): undefined reference to `gnutls_credentials_set'
tls.c:(.text+0x79): undefined reference to `tcp_connect'
tls.c:(.text+0x91): undefined reference to `gnutls_transport_set_ptr'
tls.c:(.text+0x9d): undefined reference to `gnutls_handshake'
tls.c:(.text+0xdc): undefined reference to `gnutls_perror'
tls.c:(.text+0x109): undefined reference to `gnutls_record_send'
tls.c:(.text+0x125): undefined reference to `gnutls_record_recv'
tls.c:(.text+0x154): undefined reference to `gnutls_strerror'
tls.c:(.text+0x1e6): undefined reference to `gnutls_bye'
tls.c:(.text+0x1f2): undefined reference to `tcp_close'
tls.c:(.text+0x1fe): undefined reference to `gnutls_deinit'
tls.c:(.text+0x20a): undefined reference to `gnutls_anon_free_client_credentials'
tls.c:(.text+0x20f): undefined reference to `gnutls_global_deinit'
collect2: ld returned 1 exit status
This is a linking error. You need to include some library with the -l flag. Taking a wild guess without knowing your setup, I would try -lgnutls
Related
So I've been searching for nigh on two hours now, haven't found a single working solution. I'm using SDL 2.0.4, and all the libraries are for the x64 architecture. I don't get the errors with SDL v1, but I need some of the newer functions. Here's what's coming up:
Info: Internal Builder is used for build
gcc -o Winchester.exe "src\\Winchester.o" -lmingw32 -lSDL2
src\Winchester.o: In function `SDL_main':
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:17: undefined reference to `SDL_Init'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:20: undefined reference to `SDL_CreateWindow'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:22: undefined reference to `SDL_Quit'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:26: undefined reference to `SDL_CreateRenderer'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:28: undefined reference to `SDL_DestroyWindow'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:29: undefined reference to `SDL_Quit'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:36: undefined reference to `SDL_PollEvent'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:39: undefined reference to `SDL_DestroyRenderer'
C:\Users\inigo\workspace\Winchester\Debug/../src/Winchester.c:40: undefined reference to `SDL_DestroyWindow'
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../libmingw32.a(main.o):(.text.startup+0xa7): undefined reference to `WinMain#16'
collect2.exe: error: ld returned 1 exit status
Any help?
I've installed libudev-dev, I can see the file /usr/lib/x86_64-linux-gnu/libudev.so but when I run gcc -Wall -ludev -o test test.c I get following error..
opensourcegeek#box:~/project/udev_device_discovery$ gcc -Wall -ludev -o test test.c
/tmp/ccg6Ydod.o: In function `main':
test.c:(.text+0xa): undefined reference to `udev_new'
test.c:(.text+0x35): undefined reference to `udev_enumerate_new'
test.c:(.text+0x4a): undefined reference to `udev_enumerate_add_match_subsystem'
test.c:(.text+0x60): undefined reference to `udev_enumerate_add_match_property'
test.c:(.text+0x76): undefined reference to `udev_enumerate_add_match_property'
test.c:(.text+0x82): undefined reference to `udev_enumerate_scan_devices'
test.c:(.text+0x8e): undefined reference to `udev_enumerate_get_list_entry'
test.c:(.text+0xab): undefined reference to `udev_list_entry_get_name'
test.c:(.text+0xc2): undefined reference to `udev_device_new_from_syspath'
test.c:(.text+0xd2): undefined reference to `udev_device_get_parent'
test.c:(.text+0xe2): undefined reference to `udev_device_get_devnode'
test.c:(.text+0x105): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x119): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x13f): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x153): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x179): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x197): undefined reference to `udev_device_unref'
test.c:(.text+0x1a3): undefined reference to `udev_list_entry_get_next'
test.c:(.text+0x1be): undefined reference to `udev_enumerate_unref'
test.c:(.text+0x1ca): undefined reference to `udev_unref'
test.c:(.text+0x1cf): undefined reference to `udev_new'
test.c:(.text+0x1fa): undefined reference to `udev_enumerate_new'
test.c:(.text+0x20f): undefined reference to `udev_enumerate_add_match_subsystem'
test.c:(.text+0x225): undefined reference to `udev_enumerate_add_match_property'
test.c:(.text+0x23b): undefined reference to `udev_enumerate_add_match_property'
test.c:(.text+0x247): undefined reference to `udev_enumerate_scan_devices'
test.c:(.text+0x253): undefined reference to `udev_enumerate_get_list_entry'
test.c:(.text+0x270): undefined reference to `udev_list_entry_get_name'
test.c:(.text+0x287): undefined reference to `udev_device_new_from_syspath'
test.c:(.text+0x297): undefined reference to `udev_device_get_devnode'
test.c:(.text+0x2ba): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x2ce): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x2f4): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x308): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x32e): undefined reference to `udev_device_get_sysattr_value'
test.c:(.text+0x34c): undefined reference to `udev_device_unref'
test.c:(.text+0x358): undefined reference to `udev_list_entry_get_next'
test.c:(.text+0x373): undefined reference to `udev_enumerate_unref'
test.c:(.text+0x37f): undefined reference to `udev_unref'
collect2: error: ld returned 1 exit status
I don't usually run ubuntu, but same code works on my fedora(slightly older version of libudev) and also a pi which runs wheezy (older version of libudev).
The order is important, put the library name at the end of the compilation / linking line:
$ gcc -Wall -o test test.c -ludev
The error you see is a linker error, not because of any installation issues.. Move -ludev to the end of the command line option:
gcc -Wall -o test test.c -ludev
gcc -I/opt/cplex-studio-125/cplex/include -lcplex -L/opt/cplex-studio-125/cplex/lib/x86-64_sles10_4.1/static_pic mipex1.c
I'm trying to compile an example from cplex. -I option is fine. The -L option seems to be corrupt, since it can't find the function names.
Where is the error? In the specifiec link there is a libcplex.a.
/tmp/ccf5sKky.o: In function `main':
mipex1.c:(.text+0x9f): undefined reference to `CPXopenCPLEX'
mipex1.c:(.text+0xee): undefined reference to `CPXgeterrorstring'
mipex1.c:(.text+0x125): undefined reference to `CPXsetintparam'
mipex1.c:(.text+0x222): undefined reference to `CPXcreateprob'
mipex1.c:(.text+0x2e1): undefined reference to `CPXcopylp'
mipex1.c:(.text+0x334): undefined reference to `CPXcopyctype'
mipex1.c:(.text+0x380): undefined reference to `CPXmipopt'
mipex1.c:(.text+0x3cc): undefined reference to `CPXgetstat'
mipex1.c:(.text+0x403): undefined reference to `CPXgetobjval'
mipex1.c:(.text+0x474): undefined reference to `CPXgetnumrows'
mipex1.c:(.text+0x490): undefined reference to `CPXgetnumcols'
mipex1.c:(.text+0x4be): undefined reference to `CPXgetx'
mipex1.c:(.text+0x51c): undefined reference to `CPXgetslack'
mipex1.c:(.text+0x5f9): undefined reference to `CPXwriteprob'
mipex1.c:(.text+0x64d): undefined reference to `CPXfreeprob'
mipex1.c:(.text+0x697): undefined reference to `CPXcloseCPLEX'
mipex1.c:(.text+0x6e3): undefined reference to `CPXgeterrorstring'
collect2: error: ld returned 1 exit status
The order of appearance of the library matters. Change your compilation statement to
gcc -I/opt/cplex-studio-125/cplex/include mipex1.c L/opt/cplex-studio-125/cplex/lib/x86-64_sles10_4.1/static_pic -lcplex
(Generic version)
gcc -I/<path> -L<path> <source.c> -l<lib>
to put the library after the source file, so that, linker will search the library for the function called from the source file.
I'm new to linear programming and C. I am trying to use the lp_solve library to solve a linear equation. The problem is I can't get the demo code to work.
As described in the documentation, I downloaded lp_solve_5.5_dev.gz to my Linux machine. I extracted the files into the same folder as my code and tried to compile:
~/Desktop/Code/CA$ cc -o demo demo.c
/tmp/ccpeN8ZV.o: In function `demo':
demo.c:(.text+0x31): undefined reference to `make_lp'
demo.c:(.text+0x62): undefined reference to `set_col_name'
demo.c:(.text+0x7d): undefined reference to `set_col_name'
demo.c:(.text+0xcf): undefined reference to `set_add_rowmode'
demo.c:(.text+0x150): undefined reference to `add_constraintex'
demo.c:(.text+0x1e6): undefined reference to `add_constraintex'
demo.c:(.text+0x274): undefined reference to `add_constraintex'
demo.c:(.text+0x29c): undefined reference to `set_add_rowmode'
demo.c:(.text+0x30b): undefined reference to `set_obj_fnex'
demo.c:(.text+0x327): undefined reference to `set_maxim'
demo.c:(.text+0x33b): undefined reference to `write_LP'
demo.c:(.text+0x34e): undefined reference to `set_verbose'
demo.c:(.text+0x359): undefined reference to `solve'
demo.c:(.text+0x383): undefined reference to `get_objective'
demo.c:(.text+0x3a6): undefined reference to `get_variables'
demo.c:(.text+0x3d2): undefined reference to `get_col_name'
demo.c:(.text+0x429): undefined reference to `delete_lp'
collect2: ld returned 1 exit status
When I add liblpsolve55.a to the command I get the following errors:
~/Desktop/Code/CA$ cc -o demo demo.c liblpsolve55.a
liblpsolve55.a(lp_lib.o): In function `scaled_floor':
lp_lib.c:(.text+0x6923): undefined reference to `floor'
liblpsolve55.a(lp_lib.o): In function `scaled_ceil':
lp_lib.c:(.text+0x6f03): undefined reference to `ceil'
liblpsolve55.a(lp_lib.o): In function `set_XLI':
lp_lib.c:(.text+0x7aa2): undefined reference to `dlclose'
lp_lib.c:(.text+0x7bb3): undefined reference to `dlopen'
lp_lib.c:(.text+0x7bd1): undefined reference to `dlsym'
lp_lib.c:(.text+0x7d8a): undefined reference to `dlsym'
lp_lib.c:(.text+0x7da6): undefined reference to `dlsym'
lp_lib.c:(.text+0x7dc2): undefined reference to `dlsym'
liblpsolve55.a(lp_lib.o): In function `set_BFP':
lp_lib.c:(.text+0x7eb4): undefined reference to `dlclose'
lp_lib.c:(.text+0x7fc3): undefined reference to `dlopen'
lp_lib.c:(.text+0x7fe1): undefined reference to `dlsym'
lp_lib.c:(.text+0x831a): undefined reference to `dlsym'
lp_lib.c:(.text+0x8336): undefined reference to `dlsym'
lp_lib.c:(.text+0x8352): undefined reference to `dlsym'
lp_lib.c:(.text+0x836e): undefined reference to `dlsym'
liblpsolve55.a(lp_lib.o):lp_lib.c:(.text+0x838a): more undefined references to `dlsym' follow
................
I understand that the lp_solve libraries are not loaded in my code. Can you please tell me how I can properly link the lp_solve libraries?
You're just missing some compiler flags to include the proper libraries. As danielko said, a quick google search on the missing libraries brings up some suggestions. E.g.
Linux c++ error: undefined reference to 'dlopen'
http://sourceforge.net/p/dev-cpp/discussion/48211/thread/3bd8b8a1
These suggest your compilation should be something more like:
cc -o demo demo.c -ldl -llpsolve55
and the lpsolve documentation suggests a command that includes the project directory such as:
cc -I/lp_solve_5.5 -I/lp_solve_5.5/bfp -I/lp_solve_5.5/bfp/bfp_etaPFI -I/lp_solve_5.5/colamd $src -o MyExe.exe -lm -ldl
I'm trying to compile the zpipe.c example in my Linux(Ubuntu 8.04) with gcc, but I'm getting some errors, take a look:
[ubuntu#eeepc:~/Desktop] gcc zpipe.c
/tmp/ccczEQxz.o: In function `def':
zpipe.c:(.text+0x65): undefined reference to `deflateInit_'
zpipe.c:(.text+0xd3): undefined reference to `deflateEnd'
zpipe.c:(.text+0x150): undefined reference to `deflate'
zpipe.c:(.text+0x1e8): undefined reference to `deflateEnd'
zpipe.c:(.text+0x27b): undefined reference to `deflateEnd'
/tmp/ccczEQxz.o: In function `inf':
zpipe.c:(.text+0x314): undefined reference to `inflateInit_'
zpipe.c:(.text+0x382): undefined reference to `inflateEnd'
zpipe.c:(.text+0x3d7): undefined reference to `inflate'
zpipe.c:(.text+0x44b): undefined reference to `inflateEnd'
zpipe.c:(.text+0x4c1): undefined reference to `inflateEnd'
zpipe.c:(.text+0x4f6): undefined reference to `inflateEnd'
collect2: ld returned 1 exit status
[ubuntu#eeepc:~/Desktop]
Remember that I've installed zLib-dev correctly, but why i'm getting this errors?
You need to link it with the zlib library as well. Just add -lz to near end of your command line.