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SubjectRe: 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 <tigran@veritas.com> 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 20000724 (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 20000724 (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
hello 192 0 (unused)
vmnet 18016 3
vmmon 19236 0 (unused)

Yes, it works. Thank you.

Tigran

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