tools/testing/selftests/lib.mk

Source file repositories/reference/linux-study-clean/tools/testing/selftests/lib.mk

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/lib.mk
Extension
.mk
Size
8312 bytes
Lines
241
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: build/configuration rule
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

# This mimics the top-level Makefile. We do it explicitly here so that this
# Makefile can operate with or without the kbuild infrastructure.
ifneq ($(LLVM),)
ifneq ($(filter %/,$(LLVM)),)
LLVM_PREFIX := $(LLVM)
else ifneq ($(filter -%,$(LLVM)),)
LLVM_SUFFIX := $(LLVM)
endif

CLANG := $(LLVM_PREFIX)clang$(LLVM_SUFFIX)

CLANG_TARGET_FLAGS_arm          := arm-linux-gnueabi
CLANG_TARGET_FLAGS_arm64        := aarch64-linux-gnu
CLANG_TARGET_FLAGS_hexagon      := hexagon-linux-musl
CLANG_TARGET_FLAGS_i386         := i386-linux-gnu
CLANG_TARGET_FLAGS_m68k         := m68k-linux-gnu
CLANG_TARGET_FLAGS_mips         := mipsel-linux-gnu
CLANG_TARGET_FLAGS_powerpc      := powerpc64le-linux-gnu
CLANG_TARGET_FLAGS_riscv        := riscv64-linux-gnu
CLANG_TARGET_FLAGS_s390         := s390x-linux-gnu
CLANG_TARGET_FLAGS_x86          := x86_64-linux-gnu
CLANG_TARGET_FLAGS_x86_64       := x86_64-linux-gnu

# Default to host architecture if ARCH is not explicitly given.
ifeq ($(ARCH),)
CLANG_TARGET_FLAGS := $(shell $(CLANG) -print-target-triple)
else
CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(ARCH))
endif

ifeq ($(CROSS_COMPILE),)
ifeq ($(CLANG_TARGET_FLAGS),)
$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk)
else
CLANG_FLAGS     += --target=$(CLANG_TARGET_FLAGS)
endif # CLANG_TARGET_FLAGS
else
CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
endif # CROSS_COMPILE

# gcc defaults to silence (off) for the following warnings, but clang defaults
# to the opposite. The warnings are not useful for the kernel itself, which is
# why they have remained disabled in gcc for the main kernel build. And it is
# only due to including kernel data structures in the selftests, that we get the
# warnings from clang. Therefore, disable the warnings for clang builds.
CFLAGS += -Wno-address-of-packed-member
CFLAGS += -Wno-gnu-variable-sized-type-not-at-end

CC := $(CLANG) $(CLANG_FLAGS) -fintegrated-as
else
CC := $(CROSS_COMPILE)gcc
endif # LLVM

ifeq (0,$(MAKELEVEL))
    ifeq ($(OUTPUT),)
	OUTPUT := $(shell pwd)
	DEFAULT_INSTALL_HDR_PATH := 1
    endif
endif
selfdir = $(realpath $(dir $(filter %/lib.mk,$(MAKEFILE_LIST))))
top_srcdir = $(selfdir)/../../..

# msg: emit succinct information message describing current building step
# $1 - generic step name (e.g., CC, LINK, etc);
# $2 - optional "flavor" specifier; if provided, will be emitted as [flavor];
# $3 - target (assumed to be file); only file name will be emitted;
# $4 - optional extra arg, emitted as-is, if provided.
ifeq ($(V),1)
Q =
msg =

Annotation

Implementation Notes