[Bug 240856] sqrt problem

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240856

            Bug ID: 240856
           Summary: sqrt problem
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: heinrich.adam at iml.unibe.ch

if I compile :

#include <math.h>

double Summx2 = 2.0;
double StandardDeviation;

int main (int argc, char **argv)
        {
                StandardDeviation = sqrt(Summx2);

                return 0;
        }

with :
gcc `pkg-config --cflags gtk+-3.0` -o "test" "test.c" `pkg-config --libs
gtk+-3.0`

I receive
/usr/local/bin/ld: /tmp//ccQtgX7c.o: undefined reference to symbol
'sqrt@@FBSD_1.0'
/usr/local/bin/ld: /lib/libm.so.5: error adding symbols: DSO missing from
command line
collect2: error: ld returned 1 exit status

Its only the problem part I need gtk for display the GUI, the full programm ist
to long.

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