mex c compile using arc4random_uniform gets undefined reference to `arc4random_uniform' collect2.exe: error: ld returned 1 exit status

2019 11 24
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更新时间：2019 12 1
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I am trying to install SPIKY on Matlab 2019b which has as part of the SPIKY install the mex script:
mex -Dchar16_t=uint16_T SPIKE_order_surro_MEX.c
The program
SPIKE_order_surro_MEX.c
contains the following:
while (sc<num_swaps) {
brk=0;
coin=arc4random_uniform(num_coins)+1; // get random integer
The compile generates the following error:
Building with 'MinGW64 Compiler (C)'
.
Error using mex
C:\Users\RobLe\AppData\Local\Temp\mex_57607468677249_25364\SPIKE_order_surro_MEX.obj:SPIKE_order_surro_MEX.c:(.text+0x1d0): undefined reference to
`arc4random_uniform'
collect2.exe: error: ld returned 1 exit status
Error in SPIKY_compile_MEX (line 27)
mex -Dchar16_t=uint16_T SPIKE_order_surro_MEX.c
Any idea how I fix this ?
Thanks

6 个评论
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Jan
Jan 2019-11-24
What is SPIKY? Can you provide a link to this software package? Did you contact the authors already?
ROBERT LENZIE
ROBERT LENZIE 2019-11-24
Jan, Thanks for getting back. SPIKY is code for analysis of neuronal spike trains. The download page is here http://wwwold.fi.isc.cnr.it/users/thomas.kreuz/Source-Code/SPIKY.html
I contacted them and they suggested changing
// coin=arc4random_uniform(num_coins)+1; // gets random integer between 1 and num_coins
to
coin=arc4random_uniform % num_coins; // gets random integer between 0 and num_coins-1
coin = coin +1; // increment by 1
which produced a similar error. For some reason the compiler on my machine is not able to find
arc4random_uniform
They also suggested using arc4random instead of arc4random_uniform which again prodces a similar error.
James Tursa
James Tursa 2019-11-25
Can you find the functions arc4random or arc4random_uniform anywhere in your source code?
ROBERT LENZIE
ROBERT LENZIE 2019-12-1
e.g
coin=arc4random % num_coins; // gets random integer between 0 and num_coins-1
coin = coin +1; // increment by 1
ROBERT LENZIE
ROBERT LENZIE 2019-12-1
this source code line is in the module SPIKE_order_surro_MEX.c
ROBERT LENZIE
ROBERT LENZIE 2019-12-1
the package writer got back to me and suggested the following fix. The problem is I am using Windows 10 and not unix/linux :
Please find the solution below.
First, they need to install the bsd library:
Open the terminal Ctrl+Alt+T
(optionally run the sudo apt-get update)
sudo apt-get install libbsd-dev
Second, they need to add it to our code (SPIKE_order_surro_MEX.c): (they could use MATLAB editor)
#include <bsd/stdlib.h>
I have added it after #include <string.h>
Finally, they need to pass the -lbsd to the mex compiler
mex -lbsd SPIKE_order_surro_MEX.c
I have installed Ubuntu 18.04 this morning on my hyper-v virtual machine. I downloaded SPIKY, installed GCC. And with those 3 steps it works.
Let me know if they still have problems,
Cheers,
n.

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