Ali, Andrew, On Mon, Nov 17, 2014 at 10:27 AM, Andrew Haley <aph@xxxxxxxxxx> wrote: > On 11/17/2014 06:16 PM, Ali Abdul Ghani wrote: >> /tmp/cc0fh9Tm.o: In function `eratosthenes': >> q.c:(.text+0x31): undefined reference to `sqrt' >> collect2: error: ld returned 1 exit status >> What is the problem and what is the solution? > > If you want math, you link with libm. > > http://stackoverflow.com/questions/5419366/why-do-i-have-to-explicitly-link-with-libm > http://stackoverflow.com/questions/1033898/why-do-you-have-to-link-the-math-library-in-c > > This has been so since the dawn of time itself. It also depends on the libc. For instance, libm is a part of libc for musl-libc (although libm.so is still provided as a symlink for compatibility), and MSVCRT/libmingwex.a: http://mingw.5.n7.nabble.com/Problem-with-libm-a-tt3001.html#a3002 > Andrew. > -Bryan
