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support/dependencies: clarify intended use of host bison/flex

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We should not rely on host installed bison/flex for target code. This
ensures better reproducibility of generated code.

http://lists.busybox.net/pipermail/buildroot/2020-November/296786.html

Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Baruch Siach 2020-11-20 07:08:41 +02:00 committed by Peter Korsgaard
parent c356b20ba8
commit 1b1c049af2
1 changed files with 4 additions and 0 deletions
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4
support/dependencies/check-host-bison-flex.mk
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@ -1,5 +1,9 @@
# If the system lacks bison or flex, add
# dependencies to suitable host packages
#
# BR2_{BISON,FLES}_HOST_DEPENDENCY should only be used to build code
# that runs on host, e.g. Kconfig. To build code for target use plain
# host-{bison,flex}.
ifeq ($(shell which bison 2>/dev/null),)
BR2_BISON_HOST_DEPENDENCY = host-bison