44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
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From: Changqing Li <changqing.li@windriver.com>
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Date: Wed, 23 Nov 2022 08:23:46 +0800
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Subject: [Linuxptp-devel] [PATCH] makefile: use conditional assignment for KBUILD_OUTPUT
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Refer [1],from make 4.4, all variables that are marked as export will
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also be passed to the shell started by the shell function. use "=" will
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make KBUILD_OUTPUT always empty for shell function, use "?=" to make
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"export KBUILD_OUTPUT" in enrironment can work.
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[snip of 4.4 NEWS]
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* WARNING: Backward-incompatibility!
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Previously makefile variables marked as export were not exported to commands
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started by the $(shell ...) function. Now, all exported variables are
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exported to $(shell ...).
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[snip]
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[1] https://git.savannah.gnu.org/cgit/make.git/tree/NEWS?h=4.4&id=ed493f6c9116cc217b99c2cfa6a95f15803235a2#n74
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Signed-off-by: Changqing Li <changqing.li@windriver.com>
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[Retrieved from mailing list. The patch was not yet accepted and applied:
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https://www.mail-archive.com/linuxptp-devel@lists.sourceforge.net/msg06151.html]
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Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
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---
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makefile | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/makefile b/makefile
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index 9aed383..ba3fb38 100644
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--- a/makefile
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+++ b/makefile
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@@ -15,7 +15,7 @@
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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-KBUILD_OUTPUT =
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+KBUILD_OUTPUT ?=
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DEBUG =
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CC = $(CROSS_COMPILE)gcc
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--
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2.25.1
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