On Thu, Jul 04, 2024 at 10:47:55PM +0900, Masahiro Yamada wrote: > 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. Seems reasonable. If someone gets bit by this, I think they can just build make from scratch if they really need to keep building on this distribution. > 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@xxxxxxxxxx> Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx> > --- > > Documentation/process/changes.rst | 4 ++-- > Makefile | 22 +++------------------- > scripts/Kbuild.include | 2 +- > 3 files changed, 6 insertions(+), 22 deletions(-) > > diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst > index 5685d7bfe4d0..415ac8eeb46c 100644 > --- a/Documentation/process/changes.rst > +++ b/Documentation/process/changes.rst > @@ -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 > ---- > diff --git a/Makefile b/Makefile > index 06aa6402b385..c90d408c825e 100644 > --- a/Makefile > +++ b/Makefile > @@ -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 > diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include > index faf37bafa3f8..ed8a7493524b 100644 > --- a/scripts/Kbuild.include > +++ b/scripts/Kbuild.include > @@ -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) > -- > 2.43.0 >
