Solution to program errors using math library functions compiled with gcc in Linux

Solution to program errors using math library functions compiled with gcc in Linux-Linux general technology-Linux programming and kernel information. For more information, see the following. Symptoms:
When the math library function is used in the c program and compiled into obj, an error similar to the following occurs when the execution file is generated:

/Tmp/ccalvMPY. o: In function 'main ':
/Tmp/ccalvMPY. o (. text + 0x40): undefined reference to 'pow'

Cause:
In linux, the pow function is defined in libm. so, unlike DevC ++ or TC, which is stored in/lib in C language. C. When the connection fails, find the corresponding library to connect.

Solution:
The compiler has some common parameters, in which-l is used to identify the library information to be linked:

-Lm indicates that the math library libm. a or libm. so or libm. sl needs to be linked.

Use the following compilation command to tell the location of the math library.

Gcc filename. c-lm
Or
Gcc filename. c-lm-L/lib-L/usr/lib