[uml-user] UML build problem (trouble with include path?)

[Marco B. <ba...@cs...>]

I'm running Gentoo Linux with kernel 2.4.19, and I'm having trouble
getting UML to compile.  I have a guess about the cause of the problem
but I don't know how to fix it, so I'd appreciate any help anyone
could give me.

Once I have the patched source tree (2.4.19: this same source tree
compiles as UML fine on a friend's Debian 3.0 machine) in a directory
under my home directory (specifically, it's NOT in /usr/src/linux), I
do the following:

$ make xconfig ARCH=um (here I set the 2GB/2GB option for my machine
and leave everything else at the default)
$ make dep ARCH=um
$ make linux ARCH=um

It goes along fine for a few minutes, but then I get the following error:

make[2]: Entering directory `/home/barreno/classes/systems/project/usermode/linux/arch/um/fs/hppfs'
make all_targets
make[3]: Entering directory `/home/barreno/classes/systems/project/usermode/linux/arch/um/fs/hppfs'
gcc   -nostdinc -I /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.3/include -DKBUILD_BASENAME=hppfs_kern -D__KERNEL__ -I/home/barreno/classes/systems/project/usermode/linux/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common  -U__i386__ -Ui386 -DUM_FASTCALL -g -D__arch_um__ -DSUBARCH="i386" -D_LARGEFILE64_SOURCE -I/home/barreno/classes/systems/project/usermode/linux/arch/um/include -Derrno=kernel_errno -I/home/barreno/classes/systems/project/usermode/linux/arch/um/kernel/tt/include -I/home/barreno/classes/systems/project/usermode/linux/arch/um/kernel/skas/include  -c -o hppfs_kern.o hppfs_kern.c
In file included from /home/barreno/classes/systems/project/usermode/linux/include/linux/posix_types.h:46,
                 from /home/barreno/classes/systems/project/usermode/linux/include/linux/types.h:8,
                 from /home/barreno/classes/systems/project/usermode/linux/include/linux/kernel.h:13,
                 from /home/barreno/classes/systems/project/usermode/linux/include/linux/wait.h:13,
                 from /home/barreno/classes/systems/project/usermode/linux/include/linux/fs.h:12,
                 from hppfs_kern.c:6:
/usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.3/include/asm/posix_types.h:3: features.h: No such file or directory
make[3]: *** [hppfs_kern.o] Error 1
make[3]: Leaving directory `/home/barreno/classes/systems/project/usermode/linux/arch/um/fs/hppfs'
make[2]: *** [first_rule] Error 2
make[2]: Leaving directory `/home/barreno/classes/systems/project/usermode/linux/arch/um/fs/hppfs'
make[1]: *** [_subdir_hppfs] Error 2
make[1]: Leaving directory `/home/barreno/classes/systems/project/usermode/linux/arch/um/fs'
make: *** [_dir_arch/um/fs] Error 2

I think the reason why I'm having the problem is that
/usr/lib/gcc-lib/.../asm/posix_types.h is being included when it
probably should be /home/barreno/.../linux/include/asm/posix_types.h.
It seems suspicious to me that '-I/usr/lib/gcc-lib...' is being
included first on the gcc command line, though other command lines
earlier in the build put it at the end:

gcc -D__KERNEL__ -I/home/barreno/classes/systems/project/usermode/linux/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common  -U__i386__ -Ui386 -DUM_FASTCALL -g -D__arch_um__ -DSUBARCH="i386" -D_LARGEFILE64_SOURCE -I/home/barreno/classes/systems/project/usermode/linux/arch/um/include -Derrno=kernel_errno -I/home/barreno/classes/systems/project/usermode/linux/arch/um/kernel/tt/include -I/home/barreno/classes/systems/project/usermode/linux/arch/um/kernel/skas/include   -nostdinc -I /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.3/include -DKBUILD_BASENAME=hostfs_kern  -c -o hostfs_kern.o hostfs_kern.c

But I'm not positive this is the cause of the problem, and even if it
is I'm not sure why it's happening or how to fix it.  And why would
this be happening on my system but not my friend's Debian system?

Any help would be appreciated.  Thanks for reading through this long
post.

Thanks,
Marco

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