在ubuntu上编译C代码时遇到问题。 （#include错误）

Question

I'm trying to compile a C program on the newest version of ubuntu, for the purpose of putting the compiled program on another machine later. However, when I compile with gcc prog.c -o prog, I get an error: "fatal error: asm/page.h: No such file or directory" Here are the headers:

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <limits.h>
#include <signal.h>
#include <unistd.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <asm/page.h>
#include <asm/unistd.h>

I get an error at #include . It says fatal error: asm/page.h: No such file or directory. Like I said, I'm just looking to compile it. Is there a way for me to get the missing header or something? Thanks.

Answer 1

Typically, asm/page.h only exists in Linux kernel tree, normally under arch/<archname>/asm/page.h , and should be used only be kernel code (or by kernel modules).

stdio.h and stdlib.h , on other hand, are not to be used in kernel code. So, your original source code looks fishy at best. Most likely it never needed that asm/page.h in first place, and in reality it just needs something like linux/types.h (this is one of headers included by one of kernel's asm/page.h ).

Answer 2

These header files are not missing they have been moved. The ubuntu packagers moved things around and the location of the header files that used to be in '/usr/include/asm' are now in '/usr/include/asm-generic '

To fix, just add a link:

sudo ln -s /usr/include/asm-generic /usr/include/asm

... or, maybe you are probably lacking build-essential. This is necessary to compile Code in linux . install build-essential

sudo apt-get install build-essential

Now recreate the proper link:

sudo ln -s /usr/include/asm-generic /usr/include/asm

Build-essential should install a /usr/include/asm-generic folder. If you lack such a folder reinstall build-essentials and verify the folder exists.

Does the /usr/include/asm-generic folder exist?

It is installed by build-essentials but examining it it is a dependency that installs it.

if /usr/include/asm-generic does not exist, try to install or reinstall linux-libc-dev.

That should create the asm-generic folder. If so delete that old link and relink asm to asm-generic.