Hi Peter,
See below.
Regards,
Arjen
From: Peter Williams <petesweet2...@gmail.com>
Sent: 22 July 2020 21:39
To: plplot-general@lists.sourceforge.net
Subject: [Plplot-general] Linking in Linux
Hello Plplot
I am at present migrating some PlPlot programs from Windows 10 to linux (mint
64 bit),
To facilitate this I have downloaded cmake and Plplot-5.15.0.tar.gz from your
website.
Following the instructions from your wiki I built an installation consisting of
static
libraries. In order to test the installation I wrote a very simple program
PlPlotTest.c:
#include <stdio.h>
#include "plplot.h"
int main()
{
printf("Plotting example\n");
plsdev("ps"); plsfnam("TestPlplot.ps");plinit();
plenv(-1.0 , 1.0 ,-1.0,1.0,1,2);
pljoin(-0.5,-0.5,0.5,0.5);
plend();
printf("Plot finished\n");
return 1;
}
and attempted to compile it with
gcc -c -I /home/peter/plplot/install_directory/include/plplot PlPlotTest.c
gcc -o PlPlotTest.exe PlPlotTest.o -L /home/peter/plplot/install_directory/lib
-lplplot -lcsirocsa -lqsastime -lm -lX11
An object file PlPlotTest.o was generated with no errors, but the linking
failed with the messages:
/usr/bin/ld: /home/peter/plplot/install_directory/lib/libplplot.a(xwin.c.o): in
function `plD_init_xw':
xwin.c:(.text+0x470): undefined reference to `pthread_mutexattr_init'
/usr/bin/ld: xwin.c:(.text+0x481): undefined reference to
`pthread_mutexattr_settype'
/usr/bin/ld: xwin.c:(.text+0x519): undefined reference to `pthread_create'
/usr/bin/ld: /home/peter/plplot/install_directory/lib/libplplot.a(xwin.c.o): in
function `plD_tidy_xw':
xwin.c:(.text+0xcd0): undefined reference to `pthread_cancel'
/usr/bin/ld: xwin.c:(.text+0xcec): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
>>AM: These unresolved symbols are from the pthreads library. I am not sure
>>why, but CMake has decided that you should use pthreads – the xwin.c source
>>file contains a macro PL_USE_PTHREADS_XWIN. And when that is defined at
>>compile time, from the configuration file, the relevant code is compiled in.
The solution is therefore: add -lpthread as a link option (not -lpthreads 😊).
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