numam-spdk/mk/spdk.common.mk
Jim Harris 050565e5ab test/nvmf: fuzz nvmf target using LLVM's libFuzzer
LLVM provides libFuzzer which does coverage-guided
fuzzing of a library or application under test.  For
SPDK, we can use this as a new and better way to
generate random commands to the SPDK nvmf target.

By default, libFuzzer provides the main() and your
source file just provides the function called by
LLVM for each iteration of random data.  But this
doesn't really work for SPDK since we need to start
the app framework and the nvmf target.  So we
specify -fsanitizer=fuzzer-no-link, explicitly
specify the location of the fuzzer_no_main library
and then call LLVMFuzzerRunDriver to start the
fuzzing process once we are ready.

Since this is all coverage-guided, we invoke the
fuzzer inside the nvmf target application.  So this
patch creates a new target application called
'llvm_nvme_fuzz'. One core is needed to run the
nvmf target, then we spawn a pthread to run the
fuzzer against it.

Currently there are two fuzzers defined.  Fuzzer 0
does random testing of admin commands.  Fuzzer 1
is focused solely on GET_LOG_PAGE and fuzzes a
smaller subset of the bytes in the spdk_nvme_cmd.

Additional fuzzers can be added in the future for
other commands, testing I/O queues, data payloads,
etc.

You do need to specify CC and CXX when running
configure, as well as specify the location of the
special clang_rt.fuzz_no_main library. The path of
that library is dependent on your clang version and
architecture. If using clang-12 on x86_64 platform,
it will look like:

CC=clang-12 CXX=clang++-12 ./configure --with-fuzzer= \
  /usr/lib/llvm-12/lib/clang/12.0.0/lib/linux/libclang_rt.fuzzer_no_main-x86_64.a

Then just do the following to demonstrate the fuzzer
tool.

make
test/nvmf/target/llvm_nvme_fuzz.sh --time=60 --fuzzer=0

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Iee0997501893ac284a3947a1db7a155c5ceb7849
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10038
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
2021-12-15 04:32:05 +00:00

491 lines
14 KiB
Makefile

#
# BSD LICENSE
#
# Copyright (c) Intel Corporation.
# Copyright (c) 2017, IBM Corporation.
# Copyright (c) 2019, 2021 Mellanox Corporation.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Intel Corporation nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
ifeq ($(wildcard $(SPDK_ROOT_DIR)/mk/config.mk),)
$(error mk/config.mk: file not found. Please run configure before make)
endif
include $(SPDK_ROOT_DIR)/mk/config.mk
-include $(SPDK_ROOT_DIR)/mk/cc.flags.mk
-include $(SPDK_ROOT_DIR)/mk/cc.mk
ifneq ($(V),1)
Q ?= @
endif
S ?= $(notdir $(CURDIR))
DESTDIR?=
EXEEXT?=
ifneq ($(prefix),)
CONFIG_PREFIX=$(prefix)
endif
bindir?=$(CONFIG_PREFIX)/bin
libdir?=$(CONFIG_PREFIX)/lib
includedir?=$(CONFIG_PREFIX)/include
ifeq ($(MAKECMDGOALS),)
MAKECMDGOALS=$(.DEFAULT_GOAL)
endif
TARGET_TRIPLET := $(shell $(CC) -dumpmachine)
TARGET_TRIPLET_WORDS := $(subst -, ,$(TARGET_TRIPLET))
ifneq ($(filter linux%,$(TARGET_TRIPLET_WORDS)),)
OS = Linux
endif
ifneq ($(filter freebsd%,$(TARGET_TRIPLET_WORDS)),)
OS = FreeBSD
endif
ifneq ($(filter mingw% windows%,$(TARGET_TRIPLET_WORDS)),)
OS = Windows
endif
TARGET_ARCHITECTURE ?= $(CONFIG_ARCH)
TARGET_MACHINE := $(firstword $(TARGET_TRIPLET_WORDS))
ifeq ($(OS),Windows)
EXEEXT = .exe
endif
COMMON_CFLAGS = -g $(C_OPT) -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wmissing-declarations -fno-strict-aliasing -I$(SPDK_ROOT_DIR)/include
ifneq ($(filter powerpc% ppc%,$(TARGET_MACHINE)),)
COMMON_CFLAGS += -mcpu=$(TARGET_ARCHITECTURE)
else ifeq ($(TARGET_MACHINE),aarch64)
COMMON_CFLAGS += -march=$(TARGET_ARCHITECTURE)
COMMON_CFLAGS += -DPAGE_SIZE=$(shell getconf PAGESIZE)
else
COMMON_CFLAGS += -march=$(TARGET_ARCHITECTURE)
endif
ifeq ($(CONFIG_WERROR), y)
COMMON_CFLAGS += -Werror
endif
ifeq ($(CONFIG_LTO),y)
COMMON_CFLAGS += -flto
LDFLAGS += -flto
endif
ifeq ($(CONFIG_PGO_CAPTURE),y)
COMMON_CFLAGS += -fprofile-generate=$(SPDK_ROOT_DIR)/build/pgo
LDFLAGS += -fprofile-generate=$(SPDK_ROOT_DIR)/build/pgo
endif
ifeq ($(CONFIG_PGO_USE),y)
COMMON_CFLAGS += -fprofile-use=$(SPDK_ROOT_DIR)/build/pgo
LDFLAGS += -fprofile-use=$(SPDK_ROOT_DIR)/build/pgo
endif
ifeq ($(CONFIG_CET),y)
COMMON_CFLAGS += -fcf-protection
LDFLAGS += -fcf-protection
endif
COMMON_CFLAGS += -Wformat -Wformat-security
COMMON_CFLAGS += -D_GNU_SOURCE
# Always build PIC code so that objects can be used in shared libs and position-independent executables
COMMON_CFLAGS += -fPIC
# Enable stack buffer overflow checking
COMMON_CFLAGS += -fstack-protector
ifeq ($(OS).$(CC_TYPE),Windows.gcc)
# Workaround for gcc bug 86832 - invalid TLS usage
COMMON_CFLAGS += -mstack-protector-guard=global
endif
# Prevent accidental multiple definitions of global variables
COMMON_CFLAGS += -fno-common
# Enable full RELRO - no lazy relocation (resolve everything at load time).
# This allows the GOT to be made read-only early in the loading process.
ifneq ($(OS),Windows)
LDFLAGS += -Wl,-z,relro,-z,now
endif
# Make the stack non-executable.
# This is the default in most environments, but it doesn't hurt to set it explicitly.
ifneq ($(OS),Windows)
LDFLAGS += -Wl,-z,noexecstack
endif
# Specify the linker to use
ifneq ($(LD_TYPE),)
LDFLAGS += -fuse-ld=$(LD_TYPE)
endif
SYS_LIBS =
ifeq ($(OS),FreeBSD)
SYS_LIBS += -L/usr/local/lib
COMMON_CFLAGS += -I/usr/local/include
endif
# Attach only if PMDK lib specified with configure
ifneq ($(CONFIG_PMDK_DIR),)
LIBS += -L$(CONFIG_PMDK_DIR)/src/nondebug
COMMON_CFLAGS += -I$(CONFIG_PMDK_DIR)/src/include
endif
ifeq ($(CONFIG_RDMA),y)
SYS_LIBS += -libverbs -lrdmacm
endif
ifeq ($(CONFIG_URING),y)
SYS_LIBS += -luring
ifneq ($(strip $(CONFIG_URING_PATH)),)
CFLAGS += -I$(CONFIG_URING_PATH)
LDFLAGS += -L$(CONFIG_URING_PATH)
endif
endif
IPSEC_MB_DIR=$(SPDK_ROOT_DIR)/intel-ipsec-mb/lib
ISAL_DIR=$(SPDK_ROOT_DIR)/isa-l
ifeq ($(CONFIG_ISAL), y)
SYS_LIBS += -L$(ISAL_DIR)/.libs -lisal
COMMON_CFLAGS += -I$(ISAL_DIR)/..
endif
ifeq ($(CONFIG_VFIO_USER), y)
ifneq ($(CONFIG_VFIO_USER_DIR),)
VFIO_USER_DIR=$(CONFIG_VFIO_USER_DIR)
else
VFIO_USER_DIR=$(SPDK_ROOT_DIR)/libvfio-user
endif
ifeq ($(CONFIG_DEBUG), y)
VFIO_USER_BUILD_TYPE=dbg
else
VFIO_USER_BUILD_TYPE=release
endif
VFIO_USER_INSTALL_DIR=$(VFIO_USER_DIR)/build
VFIO_USER_INCLUDE_DIR=$(VFIO_USER_INSTALL_DIR)/usr/local/include
VFIO_USER_LIBRARY_DIR=$(VFIO_USER_INSTALL_DIR)/usr/local/lib64
ifeq (,$(wildcard $(VFIO_USER_LIBRARY_DIR)/.))
# Some Linux distros use lib instead of lib64
# for default installations
VFIO_USER_LIBRARY_DIR=$(VFIO_USER_INSTALL_DIR)/usr/local/lib
endif
CFLAGS += -I$(VFIO_USER_INCLUDE_DIR)
LDFLAGS += -L$(VFIO_USER_LIBRARY_DIR)
SYS_LIBS += -Wl,-Bstatic -lvfio-user -Wl,-Bdynamic -ljson-c
endif
#Attach only if FreeBSD and RDMA is specified with configure
ifeq ($(OS),FreeBSD)
ifeq ($(CONFIG_RDMA),y)
# Mellanox - MLX4 HBA Userspace Library
ifneq ("$(wildcard /usr/lib/libmlx4.*)","")
SYS_LIBS += -lmlx4
endif
# Mellanox - MLX5 HBA Userspace Library
ifneq ("$(wildcard /usr/lib/libmlx5.*)","")
SYS_LIBS += -lmlx5
endif
# Chelsio HBA Userspace Library
ifneq ("$(wildcard /usr/lib/libcxgb4.*)","")
SYS_LIBS += -lcxgb4
endif
endif
endif
ifeq ($(CONFIG_FC),y)
ifneq ($(strip $(CONFIG_FC_PATH)),)
SYS_LIBS += -L$(CONFIG_FC_PATH)
endif
SYS_LIBS += -lufc
endif
ifeq ($(CONFIG_DEBUG), y)
COMMON_CFLAGS += -DDEBUG -O0 -fno-omit-frame-pointer
else
COMMON_CFLAGS += -DNDEBUG -O2
# Enable _FORTIFY_SOURCE checks - these only work when optimizations are enabled.
COMMON_CFLAGS += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2
endif
ifeq ($(CONFIG_COVERAGE), y)
COMMON_CFLAGS += -fprofile-arcs -ftest-coverage
LDFLAGS += -fprofile-arcs -ftest-coverage
ifeq ($(OS),FreeBSD)
LDFLAGS += --coverage
endif
endif
ifeq ($(OS),Windows)
WPDK_DIR = $(abspath $(CONFIG_WPDK_DIR))
COMMON_CFLAGS += -I$(WPDK_DIR)/include/wpdk -I$(WPDK_DIR)/include
LDFLAGS += -L$(WPDK_DIR)/lib
ifeq ($(CONFIG_SHARED),y)
SYS_LIBS += -lwpdk
else
SYS_LIBS += $(WPDK_DIR)/lib/libwpdk.a
endif
SYS_LIBS += -ldbghelp -lkernel32 -lsetupapi -lws2_32 -lrpcrt4 -liphlpapi
endif
include $(CONFIG_ENV)/env.mk
ifeq ($(CONFIG_ASAN),y)
COMMON_CFLAGS += -fsanitize=address
LDFLAGS += -fsanitize=address
endif
ifeq ($(CONFIG_UBSAN),y)
COMMON_CFLAGS += -fsanitize=undefined
LDFLAGS += -fsanitize=undefined
endif
ifeq ($(CONFIG_TSAN),y)
COMMON_CFLAGS += -fsanitize=thread
LDFLAGS += -fsanitize=thread
endif
ifeq ($(CONFIG_FUZZER),y)
COMMON_CFLAGS += -fsanitize=fuzzer-no-link
LDFLAGS += -fsanitize=fuzzer-no-link
SYS_LIBS += $(CONFIG_FUZZER_LIB)
endif
SPDK_GIT_COMMIT := $(shell git rev-parse --short HEAD 2>/dev/null)
ifneq (, $(SPDK_GIT_COMMIT))
COMMON_CFLAGS += -DSPDK_GIT_COMMIT=$(SPDK_GIT_COMMIT)
endif
ifneq ($(OS),Windows)
COMMON_CFLAGS += -pthread
SYS_LIBS += -pthread
endif
ifeq ($(CONFIG_IDXD_KERNEL),y)
SYS_LIBS += -laccel-config
endif
CFLAGS += $(COMMON_CFLAGS) -Wno-pointer-sign -Wstrict-prototypes -Wold-style-definition -std=gnu99
CXXFLAGS += $(COMMON_CFLAGS) -std=c++11
SYS_LIBS += -lrt
SYS_LIBS += -luuid
SYS_LIBS += -lcrypto
SYS_LIBS += -lm
ifneq ($(CONFIG_NVME_CUSE)$(CONFIG_FUSE),nn)
SYS_LIBS += -lfuse3
endif
ifeq ($(OS).$(CC_TYPE),Windows.gcc)
# Include libssp.a for stack-protector and _FORTIFY_SOURCE
SYS_LIBS += -l:libssp.a
endif
MAKEFLAGS += --no-print-directory
C_SRCS += $(C_SRCS-y)
CXX_SRCS += $(CXX_SRCS-y)
OBJS = $(C_SRCS:.c=.o) $(CXX_SRCS:.cpp=.o)
DEPFLAGS = -MMD -MP -MF $*.d.tmp
# Compile first input $< (.c) into $@ (.o)
COMPILE_C=\
$(Q)echo " CC $S/$@"; \
$(CC) -o $@ $(DEPFLAGS) $(CFLAGS) -c $< && \
mv -f $*.d.tmp $*.d && touch -c $@
COMPILE_CXX=\
$(Q)echo " CXX $S/$@"; \
$(CXX) -o $@ $(DEPFLAGS) $(CXXFLAGS) -c $< && \
mv -f $*.d.tmp $*.d && touch -c $@
ENV_LDFLAGS = $(if $(SPDK_NO_LINK_ENV),,$(ENV_LINKER_ARGS))
# Link $(OBJS) and $(LIBS) into $@ (app)
LINK_C=\
$(Q)echo " LINK $(notdir $@)"; \
$(CC) -o $@ $(CPPFLAGS) $(LDFLAGS) $(OBJS) $(LIBS) $(ENV_LDFLAGS) $(SYS_LIBS)
LINK_CXX=\
$(Q)echo " LINK $(notdir $@)"; \
$(CXX) -o $@ $(CPPFLAGS) $(LDFLAGS) $(OBJS) $(LIBS) $(ENV_LDFLAGS) $(SYS_LIBS)
# Provide function to ease build of a shared lib
define spdk_build_realname_shared_lib
$(1) -o $@ -shared $(CPPFLAGS) $(LDFLAGS) \
-Wl,-rpath=$(DESTDIR)/$(libdir) \
-Wl,--soname,$(notdir $@) \
-Wl,--whole-archive $(2) -Wl,--no-whole-archive \
-Wl,--version-script=$(3) \
$(4) -Wl,--no-as-needed $(5) -Wl,--as-needed
endef
BUILD_LINKERNAME_LIB=\
ln -sf $(notdir $<) $@
# Archive $(OBJS) into $@ (.a)
LIB_C=\
$(Q)echo " LIB $(notdir $@)"; \
rm -f $@; \
mkdir -p $(dir $@); \
$(CCAR) crDs $@ $(OBJS)
# Clean up generated files listed as arguments plus a default list
CLEAN_C=\
$(Q)rm -f *.a *.lib *.o *.obj *.d *.d.tmp *.pdb *.gcno *.gcda
# Install a library
INSTALL_LIB=\
$(Q)echo " INSTALL $(DESTDIR)$(libdir)/$(notdir $(LIB))"; \
install -d -m 755 "$(DESTDIR)$(libdir)"; \
install -m 644 "$(LIB)" "$(DESTDIR)$(libdir)/"
# Uninstall a library
UNINSTALL_LIB=\
$(Q)echo " UNINSTALL $(DESTDIR)$(libdir)/$(notdir $(LIB))";\
rm -f "$(DESTDIR)$(libdir)/$(notdir $(LIB))"; \
if [ -d "$(DESTDIR)$(libdir)" ] && [ $$(ls -A "$(DESTDIR)$(libdir)" | wc -l) -eq 0 ]; then rm -rf "$(DESTDIR)$(libdir)"; fi
define pkgconfig_install
echo " INSTALL $(DESTDIR)$(libdir)/pkgconfig/$(notdir $(1))";
install -d -m 755 "$(DESTDIR)$(libdir)/pkgconfig";
install -m 644 "$(1)" "$(DESTDIR)$(libdir)/pkgconfig";
endef
define pkgconfig_uninstall
echo " UNINSTALL $(DESTDIR)$(libdir)/pkgconfig/$(notdir $(1))";
rm -f "$(DESTDIR)$(libdir)/pkgconfig/$(notdir $(1))";
if [ -d "$(DESTDIR)$(libdir)/pkgconfig" ] && [ $$(ls -A "$(DESTDIR)$(libdir)/pkgconfig" | wc -l) -eq 0 ]; then rm -rf "$(DESTDIR)$(libdir)/pkgconfig"; fi;
endef
ifeq ($(OS),FreeBSD)
INSTALL_REL_SYMLINK := install -l rs
else
INSTALL_REL_SYMLINK := ln -sf -r
endif
define spdk_install_lib_symlink
$(INSTALL_REL_SYMLINK) $(DESTDIR)$(libdir)/$(1) $(DESTDIR)$(libdir)/$(2)
endef
INSTALL_SHARED_LIB=\
$(Q)echo " INSTALL $(DESTDIR)$(libdir)/$(notdir $(SHARED_LINKED_LIB))"; \
install -d -m 755 "$(DESTDIR)$(libdir)"; \
if file $(SHARED_REALNAME_LIB) | grep -q 'LSB shared object'; then \
perm_mode=755; \
else \
perm_mode=644; \
fi; \
install -m $$perm_mode "$(SHARED_REALNAME_LIB)" "$(DESTDIR)$(libdir)/"; \
$(call spdk_install_lib_symlink,$(notdir $(SHARED_REALNAME_LIB)),$(notdir $(SHARED_LINKED_LIB)));
# Uninstall an shared library
UNINSTALL_SHARED_LIB=\
$(Q)echo " UNINSTALL $(DESTDIR)$(libdir)/$(notdir $(SHARED_LINKED_LIB))"; \
rm -f "$(DESTDIR)$(libdir)/$(notdir $(SHARED_LINKED_LIB))"; \
rm -f "$(DESTDIR)$(libdir)/$(notdir $(SHARED_REALNAME_LIB))"; \
if [ -d "$(DESTDIR)$(libdir)" ] && [ $$(ls -A "$(DESTDIR)$(libdir)" | wc -l) -eq 0 ]; then rm -rf "$(DESTDIR)$(libdir)"; fi
# Install an app binary
INSTALL_APP=\
$(Q)echo " INSTALL $(DESTDIR)$(bindir)/$(notdir $<)"; \
install -d -m 755 "$(DESTDIR)$(bindir)"; \
install -m 755 "$<" "$(DESTDIR)$(bindir)/"
# Uninstall an app binary
UNINSTALL_APP=\
$(Q)echo " UNINSTALL $(DESTDIR)$(bindir)/$(notdir $(APP))"; \
rm -f "$(DESTDIR)$(bindir)/$(notdir $(APP))"; \
if [ -d "$(DESTDIR)$(bindir)" ] && [ $$(ls -A "$(DESTDIR)$(bindir)" | wc -l) -eq 0 ]; then rm -rf "$(DESTDIR)$(bindir)"; fi
INSTALL_EXAMPLE=\
$(Q)echo " INSTALL $(DESTDIR)$(bindir)/spdk_$(strip $(subst /,_,$(subst $(SPDK_ROOT_DIR)/examples/, ,$(CURDIR))))"; \
install -d -m 755 "$(DESTDIR)$(bindir)"; \
install -m 755 "$<" "$(DESTDIR)$(bindir)/spdk_$(strip $(subst /,_,$(subst $(SPDK_ROOT_DIR)/examples/, ,$(CURDIR))))"
# Uninstall an example binary
UNINSTALL_EXAMPLE=\
$(Q)echo " UNINSTALL $(DESTDIR)$(bindir)/spdk_$(strip $(subst /,_,$(subst $(SPDK_ROOT_DIR)/examples/, ,$(CURDIR))))"; \
rm -f "$(DESTDIR)$(bindir)/spdk_$(strip $(subst /,_,$(subst $(SPDK_ROOT_DIR)/examples/, ,$(CURDIR))))"; \
if [ -d "$(DESTDIR)$(bindir)" ] && [ $$(ls -A "$(DESTDIR)$(bindir)" | wc -l) -eq 0 ]; then rm -rf "$(DESTDIR)$(bindir)"; fi
# Install a header
INSTALL_HEADER=\
$(Q)echo " INSTALL $@"; \
install -d -m 755 "$(DESTDIR)$(includedir)/$(dir $(patsubst $(DESTDIR)$(includedir)/%,%,$@))"; \
install -m 644 "$(patsubst $(DESTDIR)$(includedir)/%,%,$@)" "$(DESTDIR)$(includedir)/$(dir $(patsubst $(DESTDIR)$(includedir)/%,%,$@))";
# Uninstall a header
UNINSTALL_HEADER=\
$(Q)echo " UNINSTALL $@"; \
rm -rf "$(DESTDIR)$(includedir)/$(dir $(patsubst $(DESTDIR)$(includedir)/%,%,$@))$(notdir $@)"; \
if [ -d "$(DESTDIR)$(includedir)/$(dir $(patsubst $(DESTDIR)$(includedir)/%,%,$@))" ] \
&& [ $$(ls -A "$(DESTDIR)$(includedir)/$(dir $(patsubst $(DESTDIR)$(includedir)/%,%,$@))" | wc -l) -eq 0 ]; \
then rm -rf "$(DESTDIR)$(includedir)/$(dir $(patsubst $(DESTDIR)$(includedir)/%,%,$@))"; fi
%.o: %.c %.d $(MAKEFILE_LIST)
$(COMPILE_C)
%.o: %.cpp %.d $(MAKEFILE_LIST)
$(COMPILE_CXX)
%.d: ;
define spdk_lib_list_to_static_libs
$(1:%=$(SPDK_ROOT_DIR)/build/lib/libspdk_%.a)
endef
define spdk_lib_list_to_shared_libs
$(1:%=$(SPDK_ROOT_DIR)/build/lib/libspdk_%.so)
endef
define add_no_as_needed
-Wl,--no-as-needed $(1) -Wl,-as-needed
endef
define add_whole_archive
-Wl,--whole-archive $(1) -Wl,--no-whole-archive
endef
define pkgconfig_filename
$(SPDK_ROOT_DIR)/build/lib/pkgconfig/$(1).pc
endef