| From dfd38cb29c0768692f886d3ab9158bd2b3132582 Mon Sep 17 00:00:00 2001 |
| From: Changqing Li <changqing.li@windriver.com> |
| Date: Tue, 22 Nov 2022 15:20:48 +0800 |
| Subject: [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 |
| |
| Upstream-Status: Submitted [linuxptp-devel@lists.sourceforge.net] |
| |
| Signed-off-by: Changqing Li <changqing.li@windriver.com> |
| --- |
| makefile | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| diff --git a/makefile b/makefile |
| index 529d8a0..3db60fa 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 |
| |