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Since commit applied in moby [61a3285 Support cross-compile for arm]
it hardcoded var-CC to support cross-compile for arm
Correct it with "${parameter:-word}" format, it is helpful for user
define toolchains
(Use Default Values. If parameter is unset or null, the expansion of
word is substituted. Otherwise, the value of parameter is substituted.)
https://github.com/moby/moby/commit/61a3285864d3f1b489f48f765b61b2c7bd300372
This fixes a build issue seen when building docker-ce:
exec: "aarch64-linux-gnu-gcc": executable file not found in $PATH
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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