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kbuild: raise the minimum GNU Make requirement to 4.0

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RHEL/CentOS 7, popular distributions that install GNU Make 3.82, reached
EOM/EOL on June 30, 2024. While you may get extended support, it is a
good time to raise the minimum GNU Make version.

The new requirement, GNU Make 4.0, was released in October, 2013.

I did not touch the Makefiles under tools/ because I do not know the
requirements for building tools. I do not find any GNU Make version
checks under tools/.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Masahiro Yamada 2024-07-04 22:47:55 +09:00
parent 712aba5543
commit 5f99665ee8
3 changed files with 6 additions and 22 deletions
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4
Documentation/process/changes.rst
View file

@ -33,7 +33,7 @@ GNU C 5.1 gcc --version
Clang/LLVM (optional) 13.0.1 clang --version
Rust (optional) 1.78.0 rustc --version
bindgen (optional) 0.65.1 bindgen --version
GNU make 3.82 make --version
GNU make 4.0 make --version
bash 4.2 bash --version
binutils 2.25 ld -v
flex 2.5.35 flex --version
@ -111,7 +111,7 @@ It depends on ``libclang``.
Make
----
You will need GNU make 3.82 or later to build the kernel.
You will need GNU make 4.0 or later to build the kernel.
Bash
----

22
Makefile
View file

@ -11,8 +11,8 @@ NAME = Baby Opossum Posse
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.
ifeq ($(filter undefine,$(.FEATURES)),)
$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
ifeq ($(filter output-sync,$(.FEATURES)),)
$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION))
endif
$(if $(filter __%, $(MAKECMDGOALS)), \
@ -93,15 +93,7 @@ endif
# If the user is running make -s (silent mode), suppress echoing of
# commands
# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
ifeq ($(filter 3.%,$(MAKE_VERSION)),)
short-opts := $(firstword -$(MAKEFLAGS))
else
short-opts := $(filter-out --%,$(MAKEFLAGS))
endif
ifneq ($(findstring s,$(short-opts)),)
ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
quiet=silent_
override KBUILD_VERBOSE :=
endif
@ -201,14 +193,6 @@ ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif
ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.
need-sub-make := 1
# Cancel implicit rules for this Makefile.
$(this-makefile): ;
endif
export sub_make_done := 1
endif # sub_make_done

2
scripts/Kbuild.include
View file

@ -68,7 +68,7 @@ kbuild-file = $(or $(wildcard $(src)/Kbuild),$(src)/Makefile)
# Read a file, replacing newlines with spaces
#
# Make 4.2 or later can read a file by using its builtin function.
ifneq ($(filter-out 3.% 4.0 4.1, $(MAKE_VERSION)),)
ifneq ($(filter-out 4.0 4.1, $(MAKE_VERSION)),)
read-file = $(subst $(newline),$(space),$(file < $1))
else
read-file = $(shell cat $1 2>/dev/null)