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[Xen-devel] [PATCH 2/2] xen/build: Automatically locate a suitable python interpreter

Needing to pass PYTHON=python3 into hypervisor builds is irritating and
unnecessary.  Locate a suitable interpreter automatically, defaulting to Py3
if it is available.

Reported-by: Steven Haigh <netwiz@xxxxxxxxx>
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Julien Grall <julien@xxxxxxx>
CC: Steven Haigh <netwiz@xxxxxxxxx>
CC: Juergen Gross <jgross@xxxxxxxx>

For 4.13.  This is a very-nice-to-have WRT our Py3-clean intention.
 xen/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/Makefile b/xen/Makefile
index 99701e3165..b936d1812b 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -12,6 +12,8 @@ export XEN_BUILD_DATE ?= $(shell LC_ALL=C date)
 export XEN_BUILD_TIME  ?= $(shell LC_ALL=C date +%T)
 export XEN_BUILD_HOST  ?= $(shell hostname)
 export XEN_CONFIG_EXPERT ?= n
+# Best effort attempt to find a python interpreter
+export PYTHON          ?= $(word 1,$(shell which python3 python python2))
 export BASEDIR := $(CURDIR)
 export XEN_ROOT := $(BASEDIR)/..

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