| Andrew Geissler | 517393d | 2023-01-13 08:55:19 -0600 | [diff] [blame^] | 1 | From dfd38cb29c0768692f886d3ab9158bd2b3132582 Mon Sep 17 00:00:00 2001 |
| 2 | From: Changqing Li <changqing.li@windriver.com> |
| 3 | Date: Tue, 22 Nov 2022 15:20:48 +0800 |
| 4 | Subject: [PATCH] makefile: use conditional assignment for KBUILD_OUTPUT |
| 5 | |
| 6 | Refer [1],from make 4.4, all variables that are marked as export will |
| 7 | also be passed to the shell started by the shell function. use "=" will |
| 8 | make KBUILD_OUTPUT always empty for shell function, use "?=" to make |
| 9 | "export KBUILD_OUTPUT" in enrironment can work. |
| 10 | |
| 11 | [snip of 4.4 NEWS] |
| 12 | * WARNING: Backward-incompatibility! |
| 13 | Previously makefile variables marked as export were not exported to commands |
| 14 | started by the $(shell ...) function. Now, all exported variables are |
| 15 | exported to $(shell ...). |
| 16 | [snip] |
| 17 | |
| 18 | [1] https://git.savannah.gnu.org/cgit/make.git/tree/NEWS?h=4.4&id=ed493f6c9116cc217b99c2cfa6a95f15803235a2#n74 |
| 19 | |
| 20 | Upstream-Status: Submitted [linuxptp-devel@lists.sourceforge.net] |
| 21 | |
| 22 | Signed-off-by: Changqing Li <changqing.li@windriver.com> |
| 23 | --- |
| 24 | makefile | 2 +- |
| 25 | 1 file changed, 1 insertion(+), 1 deletion(-) |
| 26 | |
| 27 | diff --git a/makefile b/makefile |
| 28 | index 529d8a0..3db60fa 100644 |
| 29 | --- a/makefile |
| 30 | +++ b/makefile |
| 31 | @@ -15,7 +15,7 @@ |
| 32 | # with this program; if not, write to the Free Software Foundation, Inc., |
| 33 | # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 34 | |
| 35 | -KBUILD_OUTPUT = |
| 36 | +KBUILD_OUTPUT ?= |
| 37 | |
| 38 | DEBUG = |
| 39 | CC ?= $(CROSS_COMPILE)gcc |
| 40 | -- |
| 41 | 2.25.1 |
| 42 | |