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