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Przemek suggests that I shouldn't accuse GCC of witchcraft, there is a simpler explanation for why we need manual define. scripts/headers_install.sh modifies the guard, removing _UAPI. That's why including a kernel header from the tree and from /usr leads to duplicate definitions. This also solves the mystery of why I needed to include the header conditionally. I had the wrong guards for most cases but ethtool. Suggested-by: Przemek Kitszel <przemyslaw.kitszel@intel.com> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com> Link: https://lore.kernel.org/r/20230621231719.2728928-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
20 lines
909 B
Makefile
20 lines
909 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Try to include uAPI headers from the kernel uapi/ path.
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# Most code under tools/ requires the respective kernel uAPI headers
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# to be copied to tools/include. The duplication is annoying.
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# All the family headers should be self-contained. We avoid the copying
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# by selectively including just the uAPI header of the family directly
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# from the kernel sources.
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UAPI_PATH:=../../../../include/uapi/
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# scripts/headers_install.sh strips "_UAPI" from header guards so we
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# need the explicit -D matching what's in /usr, to avoid multiple definitions.
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get_hdr_inc=-D$(1) -include $(UAPI_PATH)/linux/$(2)
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CFLAGS_devlink:=$(call get_hdr_inc,_LINUX_DEVLINK_H_,devlink.h)
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CFLAGS_ethtool:=$(call get_hdr_inc,_LINUX_ETHTOOL_NETLINK_H_,ethtool_netlink.h)
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CFLAGS_handshake:=$(call get_hdr_inc,_LINUX_HANDSHAKE_H,handshake.h)
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CFLAGS_netdev:=$(call get_hdr_inc,_LINUX_NETDEV_H,netdev.h)
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