Compiling multiple files in through the terminal

[Ben Duncan]

I have three files:

main.cpp: where the main() function is held

header.h the header file

Function_Def.cpp: where the function definitions from header.h is held.

How can I compile (with g++) through the terminal all three files?

I've tried making all of the files executable with the chmod command, but that seems to only work with one file, as when I type something like this:

g++ -o math main.cpp header.h Function_Def.cpp

, the compiler doesn't seem to recognize the header file.

[Moschops]

Headers are literally part of the cpp file(s) in which they are #include d

g++ -o math main.cpp Function_Def.cpp

I've tried making all of the files executable with the chmod command

That just doesn't make any sense at all. C++ source files are not executable.

[Ben Duncan]

They aren't executable, but I meant in the sense of a file, so the:

chmod +x x.cpp

I followed your advise and used only the .cpp files in g++ by doing this:

g++ -o math Practise.cpp Funct_Def.cpp

and was greeted with this:

Practise.cpp:1:21: fatal error: hearing.h: No such file or directory
compilation terminated.
Funct_Def.cpp:1:21: fatal error: hearing.h: No such file or directory
compilation terminated.

Am I doing something terribly obvious?

[hanst99]

Is the header file in your current working directory? If not, you may need to tell g++ where to look:
http://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html#Directory-Options

[Ben Duncan]

Yes, it is in the same directory, but I'll try out some of those.

[Moschops]

They aren't executable, but I meant in the sense of a file, so the:

chmod +x x.cpp

That still makes no sense and makes no difference whatsoever to the compiler. Never mind.

As Hanst says, use the -I (that's a capital i) switch to tell the compiler in which directory to find the header files.
g++ -I/location/of/your/header/ -o math Practise.cpp Funct_Def.cpp

[Moschops]

You've definitely called it the right name in your cpp files, yes? I notice that earlier you referred to it as header.h but your cpp files want hearing.h

[Ben Duncan]

Ah, well, no executables allows for less "script-esque" compiling. Thank you.

Anyway, when I type any of these in:

$ g++ -I/Programming/C++ -o math Practise.cpp Funct_Def.cpp

$ g++ -I~/Programming/C++ -o math Practise.cpp Funct_Def.cpp

$ g++ -I~/Programming/C++/hearing.h -o math Practise.cpp Funct_Def.cpp

The same error is shown.

Urgh, files.


Yeah, my file is called hearing.h. I just called it header.h earlier just for example's sake.

[bbgst]

If they are in the same directory, why are you using a -I switch? And the correct form is the second.

[strongdrink]

If you have #include <hearing.h> instead of #include "hearing.h" it may make a difference

[Ben Duncan]

bbgst: It wasn't working without it, so I thought it was worth a try.

strongdrink:

(My sincerest apologies to everyone that had to attempt to figure out what was wrong, when it was such a stupid error. Thank you all for your help, you've shown me how great the community is when something goes wrong. You are all fantastic!)

I've been programming in C++ how many months now? I still fail on the silliest errors. I'm extremely sorry for my lack of debugging. You... You get the message, eh? Thank you, ever so much!