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Note that -lm may not always need to be specified even if you use some C math functions.

For example, the following simple program:

#include <stdio.h> #include <math.h> int main() { printf("output: %f\n", sqrt(2.0)); return 0; } 

can be compiled and run successfully with the following command:

gcc test.c -o test 

It was tested on GCC 7.5.0 (on Ubuntu 16.04) and GCC 4.8.0 (on CentOS 7).

The post here gives some explanations:

The math functions you call are implemented by compiler built-in functions

See also:

• Other Built-in Functions Provided by GCC
• How can I get the GCC compiler to not optimize a standard library function call like 'printf'?

Note that -lm may not always need to be specified even if you use some C math functions.

For example, the following simple program:

#include <stdio.h> #include <math.h> int main() { printf("output: %f\n", sqrt(2.0)); return 0; } 

can be compiled and run successfully with the following command:

gcc test.c -o test 

It was tested on GCC 7.5.0 (on Ubuntu 16.04) and GCC 4.8.0 (on CentOS 7).

The post here gives some explanations:

The math functions you call are implemented by compiler built-in functions

See also:

• Other Built-in Functions Provided by GCC
• How can I get the GCC compiler to not optimize a standard library function call like 'printf'?

Note that -lm may not always need to be specified even if you use some C math functions.

For example, the following simple program:

#include <stdio.h> #include <math.h> int main() { printf("output: %f\n", sqrt(2.0)); return 0; } 

can be compiled and run successfully with the following command:

gcc test.c -o test 

Tested on gcc 7.5.0 (on Ubuntu 16.04) and gcc 4.8.0 (on CentOS 7).

The post here gives some explanations:

The math functions you call are implemented by compiler built-in functions

See also:

• https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
• https://stackoverflow.com/a/57062793/6064933

Note that -lm may not always need to be specified even if you use some C math functions.

For example, the following simple program:

#include <stdio.h> #include <math.h> int main() { printf("output: %f\n", sqrt(2.0)); return 0; } 

can be compiled and run successfully with the following command:

gcc test.c -o test 

It was tested on GCC 7.5.0 (on Ubuntu 16.04) and GCC 4.8.0 (on CentOS 7).

The post here gives some explanations:

The math functions you call are implemented by compiler built-in functions

See also:

• Other Built-in Functions Provided by GCC
• How can I get the GCC compiler to not optimize a standard library function call like 'printf'?

Note that -lm may not always need to be specified even if you use some C math functions.

For example, the following simple program:

#include <stdio.h> #include <math.h> int main() { printf("output: %f\n", sqrt(2.0)); return 0; } 

can be compiled and run successfully with the following command:

gcc test.c -o test 

Tested on gcc 7.5.0 (on Ubuntu 16.04) and gcc 4.8.0 (on CentOS 7).

The post here gives some explanations:

The math functions you call are implemented by compiler built-in functions

Note that -lm may not always need to be specified even if you use some C math functions.

For example, the following simple program:

#include <stdio.h> #include <math.h> int main() { printf("output: %f\n", sqrt(2.0)); return 0; } 

can be compiled and run successfully with the following command:

gcc test.c -o test 

Tested on gcc 7.5.0 (on Ubuntu 16.04) and gcc 4.8.0 (on CentOS 7).

The post here gives some explanations:

The math functions you call are implemented by compiler built-in functions

See also:

• https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
• https://stackoverflow.com/a/57062793/6064933