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Subject[PATCH v2 00/15] kbuild: support 'userprogs' syntax
Date

Several Makefiles use 'hostprogs' to build programs for the host
architecture where it is not appropriate to do so.
This is just because Kbuild lacks the support for building programs
for the target architecture.

This series introduce 'userprogs' syntax and use it from
sample and bpf Makefiles.

Sam worked on this in 2014.
https://lkml.org/lkml/2014/7/13/154

He used 'uapiprogs-y' but I just thought the meaning of
"UAPI programs" is unclear.

Naming the syntax is one of the most difficult parts.

I chose 'userprogs'. Anothor choice I had in my mind was 'targetprogs'.

You can test this series quickly by 'make allmodconfig samples/'

When building objects for userspace, [U] is displayed.

masahiro@oscar:~/workspace/linux$ make allmodconfig samples/
[snip]
AR samples/vfio-mdev/built-in.a
CC [M] samples/vfio-mdev/mtty.o
CC [M] samples/vfio-mdev/mdpy.o
CC [M] samples/vfio-mdev/mdpy-fb.o
CC [M] samples/vfio-mdev/mbochs.o
AR samples/mei/built-in.a
CC [U] samples/mei/mei-amt-version
CC [U] samples/auxdisplay/cfag12864b-example
CC [M] samples/configfs/configfs_sample.o
CC [M] samples/connector/cn_test.o
CC [U] samples/connector/ucon
CC [M] samples/ftrace/ftrace-direct.o
CC [M] samples/ftrace/ftrace-direct-too.o
CC [M] samples/ftrace/ftrace-direct-modify.o
CC [M] samples/ftrace/sample-trace-array.o
CC [U] samples/hidraw/hid-example
CC [M] samples/hw_breakpoint/data_breakpoint.o
CC [M] samples/kdb/kdb_hello.o
CC [M] samples/kfifo/bytestream-example.o
CC [M] samples/kfifo/dma-example.o
CC [M] samples/kfifo/inttype-example.o
CC [M] samples/kfifo/record-example.o
CC [M] samples/kobject/kobject-example.o
CC [M] samples/kobject/kset-example.o
CC [M] samples/kprobes/kprobe_example.o
CC [M] samples/kprobes/kretprobe_example.o
CC [M] samples/livepatch/livepatch-sample.o
CC [M] samples/livepatch/livepatch-shadow-mod.o
CC [M] samples/livepatch/livepatch-shadow-fix1.o
CC [M] samples/livepatch/livepatch-shadow-fix2.o
CC [M] samples/livepatch/livepatch-callbacks-demo.o
CC [M] samples/livepatch/livepatch-callbacks-mod.o
CC [M] samples/livepatch/livepatch-callbacks-busymod.o
CC [M] samples/rpmsg/rpmsg_client_sample.o
CC [U] samples/seccomp/bpf-fancy.o
CC [U] samples/seccomp/bpf-helper.o
LD [U] samples/seccomp/bpf-fancy
CC [U] samples/seccomp/dropper
CC [U] samples/seccomp/bpf-direct
CC [U] samples/seccomp/user-trap
CC [U] samples/timers/hpet_example
CC [M] samples/trace_events/trace-events-sample.o
CC [M] samples/trace_printk/trace-printk.o
CC [U] samples/uhid/uhid-example
CC [M] samples/v4l/v4l2-pci-skeleton.o
CC [U] samples/vfs/test-fsmount
CC [U] samples/vfs/test-statx
samples/vfs/test-statx.c:24:15: warning: ‘struct foo’ declared inside parameter list will not be visible outside of this definition or declaration
24 | #define statx foo
| ^~~
CC [U] samples/watchdog/watchdog-simple
AR samples/built-in.a

Changes for v2:
- Fix ARCH=i386 build error for bpfilter_umh
- Rename 'user-ccflags' to 'userccflags'
because 'user-ccflags' would conflict if an object
called 'user.o' exists in the directory.
- Support 'userldflags'

Masahiro Yamada (14):
bpfilter: match bit size of bpfilter_umh to that of the kernel
kbuild: add infrastructure to build userspace programs
bpfilter: use 'userprogs' syntax to build bpfilter_umh
samples: seccomp: build sample programs for target architecture
kbuild: doc: document the new syntax 'userprogs'
samples: uhid: build sample program for target architecture
samples: hidraw: build sample program for target architecture
samples: connector: build sample program for target architecture
samples: vfs: build sample programs for target architecture
samples: pidfd: build sample program for target architecture
samples: mei: build sample program for target architecture
samples: auxdisplay: use 'userprogs' syntax
samples: timers: use 'userprogs' syntax
samples: watchdog: use 'userprogs' syntax

Sam Ravnborg (1):
samples: uhid: fix warnings in uhid-example

Documentation/kbuild/makefiles.rst | 183 +++++++++++++++++++++--------
Makefile | 13 +-
init/Kconfig | 4 +-
net/bpfilter/Makefile | 11 +-
samples/Kconfig | 26 +++-
samples/Makefile | 4 +
samples/auxdisplay/Makefile | 11 +-
samples/connector/Makefile | 12 +-
samples/hidraw/Makefile | 9 +-
samples/mei/Makefile | 9 +-
samples/pidfd/Makefile | 8 +-
samples/seccomp/Makefile | 42 +------
samples/timers/Makefile | 17 +--
samples/uhid/.gitignore | 2 +
samples/uhid/Makefile | 9 +-
samples/uhid/uhid-example.c | 4 +-
samples/vfs/Makefile | 11 +-
samples/watchdog/Makefile | 10 +-
scripts/Makefile.build | 6 +
scripts/Makefile.clean | 2 +-
scripts/Makefile.userprogs | 45 +++++++
usr/include/Makefile | 4 +
22 files changed, 267 insertions(+), 175 deletions(-)
create mode 100644 samples/uhid/.gitignore
create mode 100644 scripts/Makefile.userprogs

--
2.25.1

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