hello()
void hello(void)
{
printf ("Hello\n");
}
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hello world module no longer compiles?!
Hi guys,
I always test new ideas or learn about things by writing a little module
that does what I want to explore. But today I discovered that on a Red Hat
6.9 system (running test10-pre3 with everything correctly upgraded) I can
no longer compile a trivial skeleton hello.c unless I use the latest gcc
instead of kgcc (which I don't really want to use); any idea why?
(my /usr/include/linux of course pointd to the kernel src's
/usr/src/linux/include/linux and the same for asm). Maybe kgcc is told to
use the headers in some hardcoded _wrong_ location and so can't
understand __exit?
# cat hello.c
#define __KERNEL__
#define MODULE
#define __SMP__
#include
#include
static int __init test_init(void)
{
return 0;
}
static void __exit test_exit(void)
{
return;
}
module_init(test_init);
module_exit(test_exit);
# kgcc -Wall -O2 -g -c -o hello.o hello.c
hello.c:13: parse error before `test_exit'
hello.c:14: warning: return-type defaults to `int'
hello.c: In function `test_exit':
hello.c:15: warning: `return' with no value, in function returning
non-void
hello.c: At top level:
hello.c:18: warning: type defaults to `int' in declaration of
`module_init'
hello.c:18: warning: parameter names (without types) in function
declaration
hello.c:18: warning: data definition has no type or storage class
hello.c:19: warning: type defaults to `int' in declaration of
`module_exit'
hello.c:19: warning: parameter names (without types) in function
declaration
hello.c:19: warning: data definition has no type or storage class
hello.c:9: warning: `test_init' defined but not used
# gcc -Wall -O2 -g -c -o hello.o hello.c
/tmp/ccSldzhv.s: Assembler messages:
/tmp/ccSldzhv.s:54: Warning: Ignoring changed section attributes for
.modinfo
# l hello.o
-rw-r--r--1 root root 4360 Oct 16 15:24 hello.o
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Re: hello world module no longer compiles?!
On Mon, 16 Oct 2000 15:29:53 +0100 (BST),
Tigran Aivazian <[EMAIL PROTECTED]> wrote:
>static void __exit test_exit(void)
>{
>return;
>}
>
>module_init(test_init);
>module_exit(test_exit);
># kgcc -Wall -O2 -g -c -o hello.o hello.c
>hello.c:13: parse error before `test_exit'
Add -v -E -dM to kgcc to see where it is reading its headers from and
to see what the macros are defined to. __exit should be defined to a
noop in a module.
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Re: hello world module no longer compiles?!
On Tue, 17 Oct 2000, Keith Owens wrote:
> On Mon, 16 Oct 2000 15:29:53 +0100 (BST),
> Tigran Aivazian <[EMAIL PROTECTED]> wrote:
> >static void __exit test_exit(void)
> >{
> >return;
> >}
> >
> >module_init(test_init);
> >module_exit(test_exit);
> ># kgcc -Wall -O2 -g -c -o hello.o hello.c
> >hello.c:13: parse error before `test_exit'
>
> Add -v -E -dM to kgcc to see where it is reading its headers from and
> to see what the macros are defined to. __exit should be defined to a
> noop in a module.
Ok,
# kgcc -v -E -dM -Wall -O2 -g -c -o hello.o hello.c
Reading specs from /usr/lib/gcc-lib/i386-glibc21-linux/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
/usr/lib/gcc-lib/i386-glibc21-linux/egcs-2.91.66/cpp -lang-c -v -undef
-D__GNUC__=2 -D__GNUC_MINOR__=91 -D__ELF__ -Dunix -Di386 -D__i386__
-Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__i386__ -D__linux__ -D__unix
-D__i386 -D__linux -Asystem(posix) -D__OPTIMIZE__ -g -Wall -dM
-Asystem(unix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__
-D__tune_i386__ hello.c -o hello.o
GNU CPP version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release) (i386
Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/i386-glibc21-linux/include
/usr/lib/gcc-lib/i386-glibc21-linux/egcs-2.91.66/include
/usr/include
End of search list.
# gcc -v -E -dM -Wall -O2 -g -c -o hello.o hello.c
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 2724 (experimental)
/usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp -lang-c -v -D__GNUC__=2
-D__GNUC_MINOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux
-D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux
-Asystem(posix) -D__OPTIMIZE__ -g -Wall -dM
-Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -D__tune_i386__
hello.c -o hello.o
GNU CPP version 2.96 2724 (experimental) (cpplib)
(i386 Linux/ELF)
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/gcc-lib/i386-redhat-linux/2.96/include
/usr/include
End of search list.
as you see, gcc tries /usr/lib/gcc-lib/i386-redhat-linux/2.96/include but
kgcc tries /usr/i386-glibc21-linux/include which contains a linux
subdirectory full of absolutely wrong stuff (i.e. presumably the old 2.2.x
kernel headers!). Therefore, simply adding -nosdtinc and an explicit -I
should fix the problem, let's try:
# kgcc -nostdinc -I/usr/src/linux/include -Wall -O2 -g -c -o hello.o
hello.c
/tmp/ccyGrYVt.s: Assembler messages:
/tmp/ccyGrYVt.s:69: Warning: Ignoring changed section attributes for
.modinfo
# insmod hello.o
# lsmod
Module Size Used by
hello192 0 (unused)
vmnet 18016 3
vmmon 19236 0 (unused)
Yes, it works. Thank you.
Tigran
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Re: hello world module no longer compiles?!
In article <[EMAIL PROTECTED]> you wrote: > # kgcc -v -E -dM -Wall -O2 -g -c -o hello.o hello.c The biggest problem with this is that you use the glibc headers (in /usr/include) instead of the kernel headers (in /usr/src/linux/include) kgcc -O2 -I/usr/src/linux/include -D__KERNEL__ -o hello.o hello.c would be a much better command-line. Greetings, Arjan van de Ven - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: hello world module no longer compiles?!
On Mon, 16 Oct 2000, Arjan van de Ven wrote: > In article <[EMAIL PROTECTED]> you wrote: > > > # kgcc -v -E -dM -Wall -O2 -g -c -o hello.o hello.c > > The biggest problem with this is that you use the glibc headers (in > /usr/include) instead of the kernel headers (in /usr/src/linux/include) > > kgcc -O2 -I/usr/src/linux/include -D__KERNEL__ -o hello.o hello.c > > would be a much better command-line. I agree. The main reason, imho, being the fact that we need and that is found in one of those "private" locations so -nostdinc will hide it unnecessarily and although the trivial hello.c would compile, a slightly less trivial one (including mm.h/sched.h) won't. But your commandline should compile anything and pick up correctly. Regards, Tigran - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Hello, your friend recommended openxxx to you
You have been invited to check out this adult site by one of your friends who visited us. our URL is http://www.openxxx.net/ enjoy, OpenXXX TEAM 2001 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
