I have encountered a problem that is undoubtedly a reflection of my ignorance of Linux. In attempting to compile the following simple C program:
#include <stdio.h> #include <math.h> #include <stdlib.h> #include <unistd.h>
int main (int argc, char ** argv)
{
double x=102.3;printf("square root of %f is %f\n",x,sqrt(x));
return(1);}
with the following statement:
gcc -Wall -D_GNU_SOURCE testsqrt.c -o testsqrt.o
I get these messages:
/tmp/ccLhrAjI.o(.text+0x2b): In function `main': : undefined reference to `sqrt' collect2: ld returned 1 exit status
According to the man page math.h is the correct header. Do I need to explicitly include a statement to the linker for the math library ? If so, which is the appropriate lib ? I have looked at libm.a (with ar -t) and don't find a sqrt.o in it (though there are several modules with sqrt within the name).
I am running a workstation install of RH9 - essentially right out of the box. After I first encountered this message I did run up2date for the 3 RPMs dealing with glibc, but that didn't change things. Otherwise everything is as it came off the install CDs.
Any help would be appreciated.
Thanks,
Buz Davis
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