Since GMU Make 4.2, $(file ...) supports the read operater '<', which is
useful to read a file without forking any process. No warning is shown even
if the input file is missing.
For older Make versions, it falls back to the cat command.
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
(no changes since v1)
Makefile | 2 +-
scripts/Kbuild.include | 12 ++++++++++++
scripts/Makefile.modfinal | 2 +-
scripts/Makefile.modinst | 2 +-
4 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index eb80332f7b51..60ce9dcafc72 100644
--- a/Makefile
+++ b/Makefile
@@ -369,7 +369,7 @@ else # !mixed-build
include $(srctree)/scripts/Kbuild.include
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
-KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
+KERNELRELEASE = $(call read-file, include/config/kernel.release)
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 9996f34327cb..722846c23264 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -10,6 +10,10 @@ empty :=
space := $(empty) $(empty)
space_escape := _-_SPACE_-_
pound := \#
+define newline
+
+
+endef
###
# Comparison macros.
@@ -55,6 +59,14 @@ stringify = $(squote)$(quote)$1$(quote)$(squote)
kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
+###
+# Read a file, replacing newlines with spaces
+ifeq ($(call test-ge, $(MAKE_VERSION), 4.2),y)
+read-file = $(subst $(newline),$(space),$(file < $1))
+else
+read-file = $(shell cat $1 2>/dev/null)
+endif
+
###
# Easy method for doing a status message
kecho := :
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index 25bedd83644b..7252f6cf7837 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -13,7 +13,7 @@ include $(srctree)/scripts/Kbuild.include
include $(srctree)/scripts/Makefile.lib
# find all modules listed in modules.order
-modules := $(sort $(shell cat $(MODORDER)))
+modules := $(sort $(call read-file, $(MODORDER)))
__modfinal: $(modules)
@:
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index a4c987c23750..509d424dbbd2 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -9,7 +9,7 @@ __modinst:
include include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
-modules := $(sort $(shell cat $(MODORDER)))
+modules := $(sort $(call read-file, $(MODORDER)))
ifeq ($(KBUILD_EXTMOD),)
dst := $(MODLIB)/kernel
--
2.34.1
