/usr/bin/ld: /tmp/ccBNWlLn.o: in function `main':main.c:(.text+0x87): undefined reference to `sqrt'/usr/bin/ld: main.c:(.text+0xb2): undefined reference to `sqrt'/usr/bin/ld: main.c:(.text+0xd1): undefined reference to `sqrt'collect2: error: ld returned 1 exit status
Question
/usr/bin/ld: /tmp/ccBNWlLn.o: in function main':main.c:(.text+0x87): undefined reference to sqrt'/usr/bin/ld: main.c:(.text+0xb2): undefined reference to sqrt'/usr/bin/ld: main.c:(.text+0xd1): undefined reference to sqrt'collect2: error: ld returned 1 exit status
Solution
The error message you're seeing is because the linker is unable to find the definition for the sqrt function. This function is defined in the math library. When you're compiling your program, you need to link the math library using -lm.
If you're using gcc to compile your program, you should do it like this:
gcc -o program program.c -lm
Here, program.c is the name of your C file, and program is the name of the output file. The -lm at the end tells the linker to link the math library.
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