diff options
Diffstat (limited to 'scripts/Makefile.build')
| -rw-r--r-- | scripts/Makefile.build | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 884dc86ce04e..a6461ea411f7 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -37,6 +37,90 @@ include $(srctree)/scripts/Makefile.compiler include $(kbuild-file) include $(srctree)/scripts/Makefile.lib +# flags that take effect in current and sub directories +KBUILD_AFLAGS += $(subdir-asflags-y) +KBUILD_CFLAGS += $(subdir-ccflags-y) +KBUILD_RUSTFLAGS += $(subdir-rustflags-y) + +# Figure out what we need to build from the various variables +# =========================================================================== + +# When an object is listed to be built compiled-in and modular, +# only build the compiled-in version +obj-m := $(filter-out $(obj-y),$(obj-m)) + +# Libraries are always collected in one lib file. +# Filter out objects already built-in +lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) + +# Subdirectories we need to descend into +subdir-ym := $(sort $(subdir-y) $(subdir-m) \ + $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m)))) + +# Handle objects in subdirs: +# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and +# foo/modules.order +# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order +# +# Generate modules.order to determine modorder. Unfortunately, we don't have +# information about ordering between -y and -m subdirs. Just put -y's first. + +ifdef need-modorder +obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m)) +else +obj-m := $(filter-out %/, $(obj-m)) +endif + +ifdef need-builtin +obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) +else +obj-y := $(filter-out %/, $(obj-y)) +endif + +# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals +suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s)))) +# List composite targets that are constructed by combining other targets +multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m))) +# List primitive targets that are compiled from source files +real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m)) + +# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object +multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y) +multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m) +multi-obj-ym := $(multi-obj-y) $(multi-obj-m) + +# Replace multi-part objects by their individual parts, +# including built-in.a from subdirectories +real-obj-y := $(call real-search, $(obj-y), .o, -objs -y) +real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) + +always-y += $(always-m) + +# hostprogs-always-y += foo +# ... is a shorthand for +# hostprogs += foo +# always-y += foo +hostprogs += $(hostprogs-always-y) $(hostprogs-always-m) +always-y += $(hostprogs-always-y) $(hostprogs-always-m) + +# userprogs-always-y is likewise. +userprogs += $(userprogs-always-y) $(userprogs-always-m) +always-y += $(userprogs-always-y) $(userprogs-always-m) + +# Add subdir path + +ifneq ($(obj),.) +extra-y := $(addprefix $(obj)/, $(extra-y)) +always-y := $(addprefix $(obj)/, $(always-y)) +targets := $(addprefix $(obj)/, $(targets)) +obj-m := $(addprefix $(obj)/, $(obj-m)) +lib-y := $(addprefix $(obj)/, $(lib-y)) +real-obj-y := $(addprefix $(obj)/, $(real-obj-y)) +real-obj-m := $(addprefix $(obj)/, $(real-obj-m)) +multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m)) +subdir-ym := $(addprefix $(obj)/, $(subdir-ym)) +endif + ifndef obj $(warning kbuild: Makefile.build is included improperly) endif @@ -222,6 +306,15 @@ $(obj)/%.lst: $(obj)/%.c FORCE # Compile Rust sources (.rs) # --------------------------------------------------------------------------- +# The features in this list are the ones allowed for non-`rust/` code. +# +# - Stable since Rust 1.81.0: `feature(lint_reasons)`. +# - Stable since Rust 1.82.0: `feature(asm_const)`, `feature(raw_ref_op)`. +# - Stable since Rust 1.87.0: `feature(asm_goto)`. +# - Expected to become stable: `feature(arbitrary_self_types)`. +# +# Please see https://github.com/Rust-for-Linux/linux/issues/2 for details on +# the unstable features in use. rust_allowed_features := asm_const,asm_goto,arbitrary_self_types,lint_reasons,raw_ref_op # `--out-dir` is required to avoid temporaries being created by `rustc` in the |