How to check the gcc compiler error message

For details about how to check the gcc compiler error message-Linux general technology-Linux programming and kernel information, see the following. For example, when gcc is used for compiling, an error is reported. only an approximate number can be found each time based on the error message. which line of error is displayed in the error message? In this way, you can locate the line and view it more conveniently.
This is my error message. it is used as an example. how can I see the error message here? Please give me some advice!
[Yh1 @ lzf 3] $ gcc-o 3-10 3-10.c
3-10.c: In the 'main' function:
3-10.c: 30: 68: Error: 'name' is not declared (used for the first time in this function)
3-10.c: 30: 68: Note: Each undeclared identifier is reported only once in the function it appears.