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linux: explain why we need host-{flex, bison}

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The commit that added the dependency on host-{bison,flex} did
so because the pre-generated kconfig parser source files were
removed from the kernel tree, in linux-4.16.

But then, in linux-4.17, the pre-generated dtc parser source
files were in turn removed as well.

So, document the two reasons why they are needed, so we don't
accidentally remove them when we (soon) introduce the kconfig
dependencies.

(Also fix the first assignment to LINUX_DEPENDENCIES to be a
simple assignement, not an append-assignment.)

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Yann E. MORIN
2018-08-17 18:06:47 +02:00
committed by Thomas Petazzoni
parent ee2af55d38
commit 9ff4167c8c
1 changed files with 7 additions and 1 deletions
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8
linux/linux.mk
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@@ -62,7 +62,13 @@ LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
LINUX_INSTALL_IMAGES = YES
LINUX_DEPENDENCIES += host-bison host-flex host-kmod
LINUX_DEPENDENCIES = host-kmod
# Starting with 4.16, the generated kconfig paser code is no longer
# shipped with the kernel sources, so we need flex and bison.
# Starting with 4.17, the generated dtc parser code is no longer
# shipped with the kernel sources, so we need flex and bison.
LINUX_DEPENDENCIES += host-bison host-flex
# host tools needed for kernel compression
ifeq ($(BR2_LINUX_KERNEL_LZ4),y)