How can I build mixed C/C++ code together?

Question

I have a .cc file which uses both iostream and malloc. How can I compile that? Using g++, it says

error: 'malloc' was not declared in this scope

using gcc, it says

fatal error: iostream: No such file or directory

The source code is located at http://sequitur.info/sequitur_simple.cc

I changed malloc to new and chaned free to delete, but I still get a lot of errors. For example

/usr/include/c++/4.6/new:103:14: error: initializing argument 2 of âvoid* operator new(std::size_t, void*)â [-fpermissive]

yep #includeing <stdlib.h> helps, also go for <string.h> as you're using memset(). I compiled the code doing those mods. — hroptatyr
– hroptatyr, Commented Feb 22, 2013 at 6:20

Karthik T · Accepted Answer · 2013-02-22 07:24:23Z

5

Either include <stdlib.h> or include <cstdlib> and change malloc to std::malloc - compile with g++. Including <cstdlib> is the prefered way for new C++ code, "name.h" style is deprecated in C++.

While this will fix you problem, it might be a better idea to migrate to new/delete, to be more consistantly C++.

edited Feb 22, 2013 at 7:24

answered Feb 22, 2013 at 6:16

Karthik T

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6 Comments

Karthik T Over a year ago

@mahmood Just noticed that, it does not include stdlib however, and that is the issue here.

Karthik T Over a year ago

@JoshPetitt the question is how to compile, and this answers it. There is no reason to downvote, if you wish to advocate new/delete you are welcome to answer it as well..

Josh Petitt Over a year ago

@KarthikT, it might answer it but it is not the "right" answer, please remove the .h include and only show the <cstdlib> and I will remove the downvote.

Karthik T Over a year ago

@JoshPetitt it is a valid fix, and I would rather leave it in for completeness, especially since with the using namespace std; statement, both are all but identical. Unless you can give a concrete reason. I have already added guidelines to my answer.

Josh Petitt Over a year ago

@KarthikT I don't know if it matters with gcc, but MSVC++ it did matter and if you used both, there would be problems when linking to the standard lib. (probably bad example to use MSVC++ since it doesn't really support C that well) why do some includes need the h and others do not

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ChaosCakeCoder · Accepted Answer · 2013-02-22 06:17:31Z

0

Have you tried to include

#include <stdio.h>      
#include <stdlib.h>

and use g++?

answered Feb 22, 2013 at 6:17

ChaosCakeCoder

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Comments

Josh Petitt · Accepted Answer · 2013-02-22 06:39:02Z

0

use new and delete in C++ code. Don't mix new and malloc. From the code you posted, there isn't any reason AFAIK you can't use new and delete

edited Feb 22, 2013 at 6:39

answered Feb 22, 2013 at 6:20

Josh Petitt

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1 Comment

congusbongus Over a year ago

Yes to prefer new/delete in C++ code, but mixing new and malloc is perfectly valid, won't confuse memory managers, and in some edge cases may be desirable.

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