From: Masahiro Yamada <masahiroy@kernel.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH 2/8] kbuild: prevent exported headers from including <stdlib.h>, <stdbool.h>
Date: Mon, 4 Apr 2022 17:03:19 +0900 [thread overview]
Message-ID: <CAK7LNATecXbEZZCxb3p9hBe7wHsLkhpavELCFbX7=ZM2hTV7sg@mail.gmail.com> (raw)
In-Reply-To: <YkqhQhJIQEL2qh8C@infradead.org>
On Mon, Apr 4, 2022 at 4:41 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Mon, Apr 04, 2022 at 03:19:42PM +0900, Masahiro Yamada wrote:
> > If we can make kernel headers self-contained (that is, none of exported
> > kernel headers includes system headers), we will be able to add the
> > -nostdinc flag, but that is much far from where we stand now.
>
> What is still missing for that?
I changed as follows:
diff --git a/usr/include/Makefile b/usr/include/Makefile
index fa9819e022b7..169fca1a0f28 100644
--- a/usr/include/Makefile
+++ b/usr/include/Makefile
@@ -15,7 +15,7 @@ UAPI_CFLAGS += $(filter -m32 -m64 --target=%,
$(KBUILD_CFLAGS))
# USERCFLAGS might contain sysroot location for CC.
UAPI_CFLAGS += $(USERCFLAGS)
-override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I$(objtree)/usr/include
+override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile)
-I$(objtree)/usr/include -nostdinc
# The following are excluded for now because they fail to build.
#
I got this:
masahiro@grover:~/ref/linux$ make -j8 allyesconfig usr/include/
#
# No change to .config
#
DESCEND objtool
CALL scripts/atomic/check-atomics.sh
CALL scripts/checksyscalls.sh
HDRTEST usr/include/linux/wireless.h
HDRTEST usr/include/linux/atmlec.h
HDRTEST usr/include/linux/if_fc.h
HDRTEST usr/include/linux/iso_fs.h
HDRTEST usr/include/linux/sysinfo.h
HDRTEST usr/include/linux/un.h
HDRTEST usr/include/linux/ax25.h
HDRTEST usr/include/linux/map_to_14segment.h
In file included from ./usr/include/linux/wireless.h:75,
from <command-line>:
./usr/include/linux/if.h:28:10: fatal error: sys/socket.h: No such
file or directory
28 | #include <sys/socket.h> /* for struct
sockaddr. */
| ^~~~~~~~~~~~~~
compilation terminated.
make[3]: *** [usr/include/Makefile:101:
usr/include/linux/wireless.hdrtest] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [scripts/Makefile.build:550: usr/include] Error 2
make[1]: *** [Makefile:1834: usr] Error 2
make: *** [Makefile:350: __build_one_by_one] Error 2
--
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2022-04-04 8:04 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-04 6:19 [PATCH 0/8] UAPI: make more exported headers self-contained, and put them into test coverage Masahiro Yamada
2022-04-04 6:19 ` [PATCH 1/8] agpgart.h: do not include <stdlib.h> from exported header Masahiro Yamada
2022-04-04 7:40 ` Christoph Hellwig
2022-04-04 17:27 ` Nick Desaulniers
2022-04-04 6:19 ` [PATCH 2/8] kbuild: prevent exported headers from including <stdlib.h>, <stdbool.h> Masahiro Yamada
2022-04-04 7:41 ` Christoph Hellwig
2022-04-04 8:01 ` Arnd Bergmann
2022-04-04 8:03 ` Masahiro Yamada [this message]
2022-04-04 17:34 ` Nick Desaulniers
2022-04-05 1:12 ` Masahiro Yamada
2022-04-04 6:19 ` [PATCH 3/8] riscv: add linux/bpf_perf_event.h to UAPI compile-test coverage Masahiro Yamada
2022-04-04 7:41 ` Christoph Hellwig
2022-04-04 6:19 ` [PATCH 4/8] mips: add asm/stat.h " Masahiro Yamada
2022-04-04 7:42 ` Christoph Hellwig
2022-04-04 6:19 ` [PATCH 5/8] powerpc: " Masahiro Yamada
2022-04-04 7:42 ` Christoph Hellwig
2022-04-04 6:19 ` [PATCH 6/8] sparc: " Masahiro Yamada
2022-04-04 7:43 ` Christoph Hellwig
2022-04-04 6:19 ` [PATCH 7/8] posix_types.h: add __kernel_uintptr_t to UAPI posix_types.h Masahiro Yamada
2022-04-04 11:30 ` kernel test robot
2022-04-04 11:51 ` Masahiro Yamada
2022-04-04 12:02 ` Masahiro Yamada
2022-04-04 11:51 ` kernel test robot
2022-04-04 13:04 ` kernel test robot
2022-04-04 6:19 ` [PATCH 8/8] virtio_ring.h: do not include <stdint.h> from exported header Masahiro Yamada
2022-04-04 7:44 ` Christoph Hellwig
2022-04-04 7:58 ` Masahiro Yamada
2022-04-04 8:04 ` Arnd Bergmann
2022-04-05 5:35 ` Christoph Hellwig
2022-04-05 6:29 ` Arnd Bergmann
2022-04-05 7:01 ` Christoph Hellwig
2022-04-05 11:55 ` Michael S. Tsirkin
2022-04-05 11:57 ` Michael S. Tsirkin
2022-04-05 11:59 ` Michael S. Tsirkin
2022-04-05 11:57 ` Michael S. Tsirkin
2022-04-04 7:34 ` [PATCH 0/8] UAPI: make more exported headers self-contained, and put them into test coverage Arnd Bergmann
2022-05-13 8:43 ` Masahiro Yamada
2022-05-13 9:01 ` Arnd Bergmann
2022-05-13 9:13 ` Masahiro Yamada
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