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build: fix symlinked .config handling

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When running "make menuconfig" with symlinked .config (e.g. to
env/.config) it renames symlink to .config.old, creates new .config file
and writes updated configuration here.

This breaks the desired workflow when changes in the configuration could
be checked using "scripts/env diff" and commited with
"scripts/env save". Since the env/.config file is not updated.

Fix this issue by exporting KCONFIG_OVERWRITECONFIG=1, which forces
mconf to overwrite the .config content, instead of renaming it and
creating a new file. This variable is set only if .config is a symlink,
otherwise the variable is not exported and the old behaviour is
preserved.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
This commit is contained in:
Sergey Ryazanov 2017-04-20 05:10:45 +03:00 committed by Jo-Philipp Wich
parent 8b9f7bd7bd
commit 37cf921352
1 changed files with 1 additions and 1 deletions
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2
include/toplevel.mk
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@ -126,7 +126,7 @@ menuconfig: scripts/config/mconf prepare-tmpinfo FORCE
if [ \! -e .config -a -e $(HOME)/.openwrt/defconfig ]; then \
cp $(HOME)/.openwrt/defconfig .config; \
fi
$< Config.in
[ -L .config ] && export KCONFIG_OVERWRITECONFIG=1; $< Config.in
prepare_kernel_conf: .config FORCE