tools/perf/config/Makefile - kernel/msm-4.19 - Gitiles


 ifeq ($(src-perf),)
 src-perf := $(srctree)/tools/perf
 endif

 ifeq ($(obj-perf),)
 obj-perf := $(OUTPUT)
 endif

 ifneq ($(obj-perf),)
 obj-perf := $(abspath $(obj-perf))/
 endif

 LIB_INCLUDE := $(srctree)/tools/lib/
 CFLAGS := $(EXTRA_CFLAGS) $(EXTRA_WARNINGS)

 include $(src-perf)/config/Makefile.arch

 NO_PERF_REGS := 1

 # Additional ARCH settings for x86
 ifeq ($(ARCH),x86)
   ifeq (${IS_X86_64}, 1)
     CFLAGS += -DHAVE_ARCH_X86_64_SUPPORT
     ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
     LIBUNWIND_LIBS = -lunwind -lunwind-x86_64
   else
     LIBUNWIND_LIBS = -lunwind -lunwind-x86
   endif
   NO_PERF_REGS := 0
 endif
 ifeq ($(ARCH),arm)
   NO_PERF_REGS := 0
   LIBUNWIND_LIBS = -lunwind -lunwind-arm
 endif

 ifeq ($(LIBUNWIND_LIBS),)
   NO_LIBUNWIND := 1
 else
   #
   # For linking with debug library, run like:
   #
   #   make DEBUG=1 LIBUNWIND_DIR=/opt/libunwind/
   #
   ifdef LIBUNWIND_DIR
     LIBUNWIND_CFLAGS  = -I$(LIBUNWIND_DIR)/include
     LIBUNWIND_LDFLAGS = -L$(LIBUNWIND_DIR)/lib
   endif
   LIBUNWIND_LDFLAGS += $(LIBUNWIND_LIBS)

   # Set per-feature check compilation flags
   FEATURE_CHECK_CFLAGS-libunwind = $(LIBUNWIND_CFLAGS)
   FEATURE_CHECK_LDFLAGS-libunwind = $(LIBUNWIND_LDFLAGS)
   FEATURE_CHECK_CFLAGS-libunwind-debug-frame = $(LIBUNWIND_CFLAGS)
   FEATURE_CHECK_LDFLAGS-libunwind-debug-frame = $(LIBUNWIND_LDFLAGS)
 endif

 ifeq ($(NO_PERF_REGS),0)
   CFLAGS += -DHAVE_PERF_REGS_SUPPORT
 endif

 ifndef NO_LIBELF
   # for linking with debug library, run like:
   # make DEBUG=1 LIBDW_DIR=/opt/libdw/
   ifdef LIBDW_DIR
     LIBDW_CFLAGS  := -I$(LIBDW_DIR)/include
     LIBDW_LDFLAGS := -L$(LIBDW_DIR)/lib

     FEATURE_CHECK_CFLAGS-libdw-dwarf-unwind := $(LIBDW_CFLAGS)
     FEATURE_CHECK_LDFLAGS-libdw-dwarf-unwind := $(LIBDW_LDFLAGS) -ldw
   endif
 endif

 # include ARCH specific config
 -include $(src-perf)/arch/$(ARCH)/Makefile

 include $(src-perf)/config/utilities.mak

 ifeq ($(call get-executable,$(FLEX)),)
   dummy := $(error Error: $(FLEX) is missing on this system, please install it)
 endif

 ifeq ($(call get-executable,$(BISON)),)
   dummy := $(error Error: $(BISON) is missing on this system, please install it)
 endif

 # Treat warnings as errors unless directed not to
 ifneq ($(WERROR),0)
   CFLAGS += -Werror
 endif

 ifndef DEBUG
   DEBUG := 0
 endif

 ifeq ($(DEBUG),0)
   CFLAGS += -O6
 endif

 ifdef PARSER_DEBUG
   PARSER_DEBUG_BISON := -t
   PARSER_DEBUG_FLEX  := -d
   CFLAGS             += -DPARSER_DEBUG
 endif

 CFLAGS += -fno-omit-frame-pointer
 CFLAGS += -ggdb3
 CFLAGS += -funwind-tables
 CFLAGS += -Wall
 CFLAGS += -Wextra
 CFLAGS += -std=gnu99

 EXTLIBS = -lelf -lpthread -lrt -lm -ldl

 ifneq ($(OUTPUT),)
   OUTPUT_FEATURES = $(OUTPUT)config/feature-checks/
   $(shell mkdir -p $(OUTPUT_FEATURES))
 endif

 feature_check = $(eval $(feature_check_code))
 define feature_check_code
   feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C config/feature-checks test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0)
 endef

 feature_set = $(eval $(feature_set_code))
 define feature_set_code
   feature-$(1) := 1
 endef

 #
 # Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
 #

 #
 # Note that this is not a complete list of all feature tests, just
 # those that are typically built on a fully configured system.
 #
 # [ Feature tests not mentioned here have to be built explicitly in
 #   the rule that uses them - an example for that is the 'bionic'
 #   feature check. ]
 #
 CORE_FEATURE_TESTS =			\
 	backtrace			\
 	dwarf				\
 	fortify-source			\
 	glibc				\
 	gtk2				\
 	gtk2-infobar			\
 	libaudit			\
 	libbfd				\
 	libelf				\
 	libelf-getphdrnum		\
 	libelf-mmap			\
 	libnuma				\
 	libperl				\
 	libpython			\
 	libpython-version		\
 	libslang			\
 	libunwind			\
 	on-exit				\
 	stackprotector-all		\
 	timerfd				\
 	libdw-dwarf-unwind

 LIB_FEATURE_TESTS =			\
 	dwarf				\
 	glibc				\
 	gtk2				\
 	libaudit			\
 	libbfd				\
 	libelf				\
 	libnuma				\
 	libperl				\
 	libpython			\
 	libslang			\
 	libunwind			\
 	libdw-dwarf-unwind

 VF_FEATURE_TESTS =			\
 	backtrace			\
 	fortify-source			\
 	gtk2-infobar			\
 	libelf-getphdrnum		\
 	libelf-mmap			\
 	libpython-version		\
 	on-exit				\
 	stackprotector-all		\
 	timerfd				\
 	libunwind-debug-frame		\
 	bionic

 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all CORE_FEATURE_TESTS features.
 # If in the future we need per-feature checks/flags for features not
 # mentioned in this list we need to refactor this ;-).
 set_test_all_flags = $(eval $(set_test_all_flags_code))
 define set_test_all_flags_code
   FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
   FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
 endef

 $(foreach feat,$(CORE_FEATURE_TESTS),$(call set_test_all_flags,$(feat)))

 #
 # Special fast-path for the 'all features are available' case:
 #
 $(call feature_check,all,$(MSG))

 #
 # Just in case the build freshly failed, make sure we print the
 # feature matrix:
 #
 ifeq ($(feature-all), 1)
   #
   # test-all.c passed - just set all the core feature flags to 1:
   #
   $(foreach feat,$(CORE_FEATURE_TESTS),$(call feature_set,$(feat)))
 else
   $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS)" LDFLAGS=$(LDFLAGS) -i -j -C config/feature-checks $(addsuffix .bin,$(CORE_FEATURE_TESTS)) >/dev/null 2>&1)
   $(foreach feat,$(CORE_FEATURE_TESTS),$(call feature_check,$(feat)))
 endif

 ifeq ($(feature-stackprotector-all), 1)
   CFLAGS += -fstack-protector-all
 endif

 ifeq ($(DEBUG),0)
   ifeq ($(feature-fortify-source), 1)
     CFLAGS += -D_FORTIFY_SOURCE=2
   endif
 endif

 CFLAGS += -I$(src-perf)/util/include
 CFLAGS += -I$(src-perf)/arch/$(ARCH)/include
 CFLAGS += -I$(srctree)/tools/include/
 CFLAGS += -I$(srctree)/arch/$(ARCH)/include/uapi
 CFLAGS += -I$(srctree)/arch/$(ARCH)/include
 CFLAGS += -I$(srctree)/include/uapi
 CFLAGS += -I$(srctree)/include

 # $(obj-perf)      for generated common-cmds.h
 # $(obj-perf)/util for generated bison/flex headers
 ifneq ($(OUTPUT),)
 CFLAGS += -I$(obj-perf)/util
 CFLAGS += -I$(obj-perf)
 endif

 CFLAGS += -I$(src-perf)/util
 CFLAGS += -I$(src-perf)
 CFLAGS += -I$(LIB_INCLUDE)

 CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE

 ifndef NO_BIONIC
   $(call feature_check,bionic)
   ifeq ($(feature-bionic), 1)
     BIONIC := 1
     EXTLIBS := $(filter-out -lrt,$(EXTLIBS))
     EXTLIBS := $(filter-out -lpthread,$(EXTLIBS))
   endif
 endif

 ifdef NO_LIBELF
   NO_DWARF := 1
   NO_DEMANGLE := 1
   NO_LIBUNWIND := 1
   NO_LIBDW_DWARF_UNWIND := 1
 else
   ifeq ($(feature-libelf), 0)
     ifeq ($(feature-glibc), 1)
       LIBC_SUPPORT := 1
     endif
     ifeq ($(BIONIC),1)
       LIBC_SUPPORT := 1
     endif
     ifeq ($(LIBC_SUPPORT),1)
       msg := $(warning No libelf found, disables 'probe' tool, please install elfutils-libelf-devel/libelf-dev);

       NO_LIBELF := 1
       NO_DWARF := 1
       NO_DEMANGLE := 1
     else
       msg := $(error No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static);
     endif
   else
     ifndef NO_LIBDW_DWARF_UNWIND
       ifneq ($(feature-libdw-dwarf-unwind),1)
         NO_LIBDW_DWARF_UNWIND := 1
         msg := $(warning No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR);
       endif
     endif
     ifneq ($(feature-dwarf), 1)
       msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev);
       NO_DWARF := 1
     endif # Dwarf support
   endif # libelf support
 endif # NO_LIBELF

 ifndef NO_LIBELF
   CFLAGS += -DHAVE_LIBELF_SUPPORT

   ifeq ($(feature-libelf-mmap), 1)
     CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
   endif

   ifeq ($(feature-libelf-getphdrnum), 1)
     CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
   endif

   # include ARCH specific config
   -include $(src-perf)/arch/$(ARCH)/Makefile

   ifndef NO_DWARF
     ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined)
       msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled);
       NO_DWARF := 1
     else
       CFLAGS += -DHAVE_DWARF_SUPPORT $(LIBDW_CFLAGS)
       LDFLAGS += $(LIBDW_LDFLAGS)
       EXTLIBS += -lelf -ldw
     endif # PERF_HAVE_DWARF_REGS
   endif # NO_DWARF
 endif # NO_LIBELF

 ifndef NO_LIBUNWIND
   ifneq ($(feature-libunwind), 1)
     msg := $(warning No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
     NO_LIBUNWIND := 1
   endif
 endif

 dwarf-post-unwind := 1
 dwarf-post-unwind-text := BUG

 # setup DWARF post unwinder
 ifdef NO_LIBUNWIND
   ifdef NO_LIBDW_DWARF_UNWIND
     msg := $(warning Disabling post unwind, no support found.);
     dwarf-post-unwind := 0
   else
     dwarf-post-unwind-text := libdw
   endif
 else
   dwarf-post-unwind-text := libunwind
   # Enable libunwind support by default.
   ifndef NO_LIBDW_DWARF_UNWIND
     NO_LIBDW_DWARF_UNWIND := 1
   endif
 endif

 ifeq ($(dwarf-post-unwind),1)
   CFLAGS += -DHAVE_DWARF_UNWIND_SUPPORT
 else
   NO_DWARF_UNWIND := 1
 endif

 ifndef NO_LIBUNWIND
   ifeq ($(ARCH),arm)
     $(call feature_check,libunwind-debug-frame)
     ifneq ($(feature-libunwind-debug-frame), 1)
       msg := $(warning No debug_frame support found in libunwind);
       CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
     endif
   else
     # non-ARM has no dwarf_find_debug_frame() function:
     CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
   endif
   CFLAGS  += -DHAVE_LIBUNWIND_SUPPORT
   EXTLIBS += $(LIBUNWIND_LIBS)
   CFLAGS  += $(LIBUNWIND_CFLAGS)
   LDFLAGS += $(LIBUNWIND_LDFLAGS)
 endif

 ifndef NO_LIBAUDIT
   ifneq ($(feature-libaudit), 1)
     msg := $(warning No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev);
     NO_LIBAUDIT := 1
   else
     CFLAGS += -DHAVE_LIBAUDIT_SUPPORT
     EXTLIBS += -laudit
   endif
 endif

 ifdef NO_NEWT
   NO_SLANG=1
 endif

 ifndef NO_SLANG
   ifneq ($(feature-libslang), 1)
     msg := $(warning slang not found, disables TUI support. Please install slang-devel or libslang-dev);
     NO_SLANG := 1
   else
     # Fedora has /usr/include/slang/slang.h, but ubuntu /usr/include/slang.h
     CFLAGS += -I/usr/include/slang
     CFLAGS += -DHAVE_SLANG_SUPPORT
     EXTLIBS += -lslang
   endif
 endif

 ifndef NO_GTK2
   FLAGS_GTK2=$(CFLAGS) $(LDFLAGS) $(EXTLIBS) $(shell $(PKG_CONFIG) --libs --cflags gtk+-2.0 2>/dev/null)
   ifneq ($(feature-gtk2), 1)
     msg := $(warning GTK2 not found, disables GTK2 support. Please install gtk2-devel or libgtk2.0-dev);
     NO_GTK2 := 1
   else
     ifeq ($(feature-gtk2-infobar), 1)
       GTK_CFLAGS := -DHAVE_GTK_INFO_BAR_SUPPORT
     endif
     CFLAGS += -DHAVE_GTK2_SUPPORT
     GTK_CFLAGS += $(shell $(PKG_CONFIG) --cflags gtk+-2.0 2>/dev/null)
     GTK_LIBS := $(shell $(PKG_CONFIG) --libs gtk+-2.0 2>/dev/null)
     EXTLIBS += -ldl
   endif
 endif

 grep-libs  = $(filter -l%,$(1))
 strip-libs = $(filter-out -l%,$(1))

 ifdef NO_LIBPERL
   CFLAGS += -DNO_LIBPERL
 else
   PERL_EMBED_LDOPTS = $(shell perl -MExtUtils::Embed -e ldopts 2>/dev/null)
   PERL_EMBED_LDFLAGS = $(call strip-libs,$(PERL_EMBED_LDOPTS))
   PERL_EMBED_LIBADD = $(call grep-libs,$(PERL_EMBED_LDOPTS))
   PERL_EMBED_CCOPTS = `perl -MExtUtils::Embed -e ccopts 2>/dev/null`
   FLAGS_PERL_EMBED=$(PERL_EMBED_CCOPTS) $(PERL_EMBED_LDOPTS)

   ifneq ($(feature-libperl), 1)
     CFLAGS += -DNO_LIBPERL
     NO_LIBPERL := 1
   else
     LDFLAGS += $(PERL_EMBED_LDFLAGS)
     EXTLIBS += $(PERL_EMBED_LIBADD)
   endif
 endif

 ifeq ($(feature-timerfd), 1)
   CFLAGS += -DHAVE_TIMERFD_SUPPORT
 else
   msg := $(warning No timerfd support. Disables 'perf kvm stat live');
 endif

 disable-python = $(eval $(disable-python_code))
 define disable-python_code
   CFLAGS += -DNO_LIBPYTHON
   $(if $(1),$(warning No $(1) was found))
   $(warning Python support will not be built)
   NO_LIBPYTHON := 1
 endef

 override PYTHON := \
   $(call get-executable-or-default,PYTHON,python)

 ifndef PYTHON
   $(call disable-python,python interpreter)
 else

   PYTHON_WORD := $(call shell-wordify,$(PYTHON))

   ifdef NO_LIBPYTHON
     $(call disable-python)
   else

     override PYTHON_CONFIG := \
       $(call get-executable-or-default,PYTHON_CONFIG,$(PYTHON)-config)

     ifndef PYTHON_CONFIG
       $(call disable-python,python-config tool)
     else

       PYTHON_CONFIG_SQ := $(call shell-sq,$(PYTHON_CONFIG))

       PYTHON_EMBED_LDOPTS := $(shell $(PYTHON_CONFIG_SQ) --ldflags 2>/dev/null)
       PYTHON_EMBED_LDFLAGS := $(call strip-libs,$(PYTHON_EMBED_LDOPTS))
       PYTHON_EMBED_LIBADD := $(call grep-libs,$(PYTHON_EMBED_LDOPTS))
       PYTHON_EMBED_CCOPTS := $(shell $(PYTHON_CONFIG_SQ) --cflags 2>/dev/null)
       FLAGS_PYTHON_EMBED := $(PYTHON_EMBED_CCOPTS) $(PYTHON_EMBED_LDOPTS)

       ifneq ($(feature-libpython), 1)
         $(call disable-python,Python.h (for Python 2.x))
       else

         ifneq ($(feature-libpython-version), 1)
           $(warning Python 3 is not yet supported; please set)
           $(warning PYTHON and/or PYTHON_CONFIG appropriately.)
           $(warning If you also have Python 2 installed, then)
           $(warning try something like:)
           $(warning $(and ,))
           $(warning $(and ,)  make PYTHON=python2)
           $(warning $(and ,))
           $(warning Otherwise, disable Python support entirely:)
           $(warning $(and ,))
           $(warning $(and ,)  make NO_LIBPYTHON=1)
           $(warning $(and ,))
           $(error   $(and ,))
         else
           LDFLAGS += $(PYTHON_EMBED_LDFLAGS)
           EXTLIBS += $(PYTHON_EMBED_LIBADD)
           LANG_BINDINGS += $(obj-perf)python/perf.so
         endif
       endif
     endif
   endif
 endif

 ifeq ($(feature-libbfd), 1)
   EXTLIBS += -lbfd
 endif

 ifdef NO_DEMANGLE
   CFLAGS += -DNO_DEMANGLE
 else
   ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
     EXTLIBS += -liberty
     CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
   else
     ifneq ($(feature-libbfd), 1)
       $(call feature_check,liberty)
       ifeq ($(feature-liberty), 1)
         EXTLIBS += -lbfd -liberty
       else
         $(call feature_check,liberty-z)
         ifeq ($(feature-liberty-z), 1)
           EXTLIBS += -lbfd -liberty -lz
         else
           $(call feature_check,cplus-demangle)
           ifeq ($(feature-cplus-demangle), 1)
             EXTLIBS += -liberty
             CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
           else
             msg := $(warning No bfd.h/libbfd found, install binutils-dev[el]/zlib-static to gain symbol demangling)
             CFLAGS += -DNO_DEMANGLE
           endif
         endif
       endif
     endif
   endif
 endif

 ifneq ($(filter -lbfd,$(EXTLIBS)),)
   CFLAGS += -DHAVE_LIBBFD_SUPPORT
 endif

 ifndef NO_ON_EXIT
   ifeq ($(feature-on-exit), 1)
     CFLAGS += -DHAVE_ON_EXIT_SUPPORT
   endif
 endif

 ifndef NO_BACKTRACE
   ifeq ($(feature-backtrace), 1)
     CFLAGS += -DHAVE_BACKTRACE_SUPPORT
   endif
 endif

 ifndef NO_LIBNUMA
   ifeq ($(feature-libnuma), 0)
     msg := $(warning No numa.h found, disables 'perf bench numa mem' benchmark, please install numactl-devel/libnuma-devel/libnuma-dev);
     NO_LIBNUMA := 1
   else
     CFLAGS += -DHAVE_LIBNUMA_SUPPORT
     EXTLIBS += -lnuma
   endif
 endif

 # Among the variables below, these:
 #   perfexecdir
 #   template_dir
 #   mandir
 #   infodir
 #   htmldir
 #   ETC_PERFCONFIG (but not sysconfdir)
 # can be specified as a relative path some/where/else;
 # this is interpreted as relative to $(prefix) and "perf" at
 # runtime figures out where they are based on the path to the executable.
 # This can help installing the suite in a relocatable way.

 # Make the path relative to DESTDIR, not to prefix
 ifndef DESTDIR
 prefix = $(HOME)
 endif
 bindir_relative = bin
 bindir = $(prefix)/$(bindir_relative)
 mandir = share/man
 infodir = share/info
 perfexecdir = libexec/perf-core
 sharedir = $(prefix)/share
 template_dir = share/perf-core/templates
 htmldir = share/doc/perf-doc
 ifeq ($(prefix),/usr)
 sysconfdir = /etc
 ETC_PERFCONFIG = $(sysconfdir)/perfconfig
 else
 sysconfdir = $(prefix)/etc
 ETC_PERFCONFIG = etc/perfconfig
 endif
 ifeq ($(IS_X86_64),1)
 lib = lib64
 else
 lib = lib
 endif
 libdir = $(prefix)/$(lib)

 # Shell quote (do not use $(call) to accommodate ancient setups);
 ETC_PERFCONFIG_SQ = $(subst ','\'',$(ETC_PERFCONFIG))
 DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
 bindir_SQ = $(subst ','\'',$(bindir))
 mandir_SQ = $(subst ','\'',$(mandir))
 infodir_SQ = $(subst ','\'',$(infodir))
 perfexecdir_SQ = $(subst ','\'',$(perfexecdir))
 template_dir_SQ = $(subst ','\'',$(template_dir))
 htmldir_SQ = $(subst ','\'',$(htmldir))
 prefix_SQ = $(subst ','\'',$(prefix))
 sysconfdir_SQ = $(subst ','\'',$(sysconfdir))
 libdir_SQ = $(subst ','\'',$(libdir))

 ifneq ($(filter /%,$(firstword $(perfexecdir))),)
 perfexec_instdir = $(perfexecdir)
 else
 perfexec_instdir = $(prefix)/$(perfexecdir)
 endif
 perfexec_instdir_SQ = $(subst ','\'',$(perfexec_instdir))

 # If we install to $(HOME) we keep the traceevent default:
 # $(HOME)/.traceevent/plugins
 # Otherwise we install plugins into the global $(libdir).
 ifdef DESTDIR
 plugindir=$(libdir)/traceevent/plugins
 plugindir_SQ= $(subst ','\'',$(plugindir))
 endif

 #
 # Print the result of the feature test:
 #
 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))

 define feature_print_status_code
   ifeq ($(feature-$(1)), 1)
     MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
   else
     MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
   endif
 endef

 feature_print_var = $(eval $(feature_print_var_code)) $(info $(MSG))
 define feature_print_var_code
     MSG = $(shell printf '...%30s: %s' $(1) $($(1)))
 endef

 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
 define feature_print_text_code
     MSG = $(shell printf '...%30s: %s' $(1) $(2))
 endef

 PERF_FEATURES := $(foreach feat,$(LIB_FEATURE_TESTS),feature-$(feat)($(feature-$(feat))))
 PERF_FEATURES_FILE := $(shell touch $(OUTPUT)PERF-FEATURES; cat $(OUTPUT)PERF-FEATURES)

 ifeq ($(dwarf-post-unwind),1)
   PERF_FEATURES += dwarf-post-unwind($(dwarf-post-unwind-text))
 endif

 # The $(display_lib) controls the default detection message
 # output. It's set if:
 # - detected features differes from stored features from
 #   last build (in PERF-FEATURES file)
 # - one of the $(LIB_FEATURE_TESTS) is not detected
 # - VF is enabled

 ifneq ("$(PERF_FEATURES)","$(PERF_FEATURES_FILE)")
   $(shell echo "$(PERF_FEATURES)" > $(OUTPUT)PERF-FEATURES)
   display_lib := 1
 endif

 feature_check = $(eval $(feature_check_code))
 define feature_check_code
   ifneq ($(feature-$(1)), 1)
     display_lib := 1
   endif
 endef

 $(foreach feat,$(LIB_FEATURE_TESTS),$(call feature_check,$(feat)))

 ifeq ($(VF),1)
   display_lib := 1
   display_vf := 1
 endif

 ifeq ($(display_lib),1)
   $(info )
   $(info Auto-detecting system features:)
   $(foreach feat,$(LIB_FEATURE_TESTS),$(call feature_print_status,$(feat),))

   ifeq ($(dwarf-post-unwind),1)
     $(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
   endif
 endif

 ifeq ($(display_vf),1)
   $(foreach feat,$(VF_FEATURE_TESTS),$(call feature_print_status,$(feat),))
   $(info )
   $(call feature_print_var,prefix)
   $(call feature_print_var,bindir)
   $(call feature_print_var,libdir)
   $(call feature_print_var,sysconfdir)
   $(call feature_print_var,LIBUNWIND_DIR)
   $(call feature_print_var,LIBDW_DIR)
 endif

 ifeq ($(display_lib),1)
   $(info )
 endif

	ifeq ($(src-perf),)
	src-perf := $(srctree)/tools/perf
	endif

	ifeq ($(obj-perf),)
	obj-perf := $(OUTPUT)
	endif

	ifneq ($(obj-perf),)
	obj-perf := $(abspath $(obj-perf))/
	endif

	LIB_INCLUDE := $(srctree)/tools/lib/
	CFLAGS := $(EXTRA_CFLAGS) $(EXTRA_WARNINGS)

	include $(src-perf)/config/Makefile.arch

	NO_PERF_REGS := 1

	# Additional ARCH settings for x86
	ifeq ($(ARCH),x86)
	ifeq (${IS_X86_64}, 1)
	CFLAGS += -DHAVE_ARCH_X86_64_SUPPORT
	ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
	LIBUNWIND_LIBS = -lunwind -lunwind-x86_64
	else
	LIBUNWIND_LIBS = -lunwind -lunwind-x86
	endif
	NO_PERF_REGS := 0
	endif
	ifeq ($(ARCH),arm)
	NO_PERF_REGS := 0
	LIBUNWIND_LIBS = -lunwind -lunwind-arm
	endif

	ifeq ($(LIBUNWIND_LIBS),)
	NO_LIBUNWIND := 1
	else
	#
	# For linking with debug library, run like:
	#
	# make DEBUG=1 LIBUNWIND_DIR=/opt/libunwind/
	#
	ifdef LIBUNWIND_DIR
	LIBUNWIND_CFLAGS = -I$(LIBUNWIND_DIR)/include
	LIBUNWIND_LDFLAGS = -L$(LIBUNWIND_DIR)/lib
	endif
	LIBUNWIND_LDFLAGS += $(LIBUNWIND_LIBS)

	# Set per-feature check compilation flags
	FEATURE_CHECK_CFLAGS-libunwind = $(LIBUNWIND_CFLAGS)
	FEATURE_CHECK_LDFLAGS-libunwind = $(LIBUNWIND_LDFLAGS)
	FEATURE_CHECK_CFLAGS-libunwind-debug-frame = $(LIBUNWIND_CFLAGS)
	FEATURE_CHECK_LDFLAGS-libunwind-debug-frame = $(LIBUNWIND_LDFLAGS)
	endif

	ifeq ($(NO_PERF_REGS),0)
	CFLAGS += -DHAVE_PERF_REGS_SUPPORT
	endif

	ifndef NO_LIBELF
	# for linking with debug library, run like:
	# make DEBUG=1 LIBDW_DIR=/opt/libdw/
	ifdef LIBDW_DIR
	LIBDW_CFLAGS := -I$(LIBDW_DIR)/include
	LIBDW_LDFLAGS := -L$(LIBDW_DIR)/lib

	FEATURE_CHECK_CFLAGS-libdw-dwarf-unwind := $(LIBDW_CFLAGS)
	FEATURE_CHECK_LDFLAGS-libdw-dwarf-unwind := $(LIBDW_LDFLAGS) -ldw
	endif
	endif

	# include ARCH specific config
	-include $(src-perf)/arch/$(ARCH)/Makefile

	include $(src-perf)/config/utilities.mak

	ifeq ($(call get-executable,$(FLEX)),)
	dummy := $(error Error: $(FLEX) is missing on this system, please install it)
	endif

	ifeq ($(call get-executable,$(BISON)),)
	dummy := $(error Error: $(BISON) is missing on this system, please install it)
	endif

	# Treat warnings as errors unless directed not to
	ifneq ($(WERROR),0)
	CFLAGS += -Werror
	endif

	ifndef DEBUG
	DEBUG := 0
	endif

	ifeq ($(DEBUG),0)
	CFLAGS += -O6
	endif

	ifdef PARSER_DEBUG
	PARSER_DEBUG_BISON := -t
	PARSER_DEBUG_FLEX := -d
	CFLAGS += -DPARSER_DEBUG
	endif

	CFLAGS += -fno-omit-frame-pointer
	CFLAGS += -ggdb3
	CFLAGS += -funwind-tables
	CFLAGS += -Wall
	CFLAGS += -Wextra
	CFLAGS += -std=gnu99

	EXTLIBS = -lelf -lpthread -lrt -lm -ldl

	ifneq ($(OUTPUT),)
	OUTPUT_FEATURES = $(OUTPUT)config/feature-checks/
	$(shell mkdir -p $(OUTPUT_FEATURES))
	endif

	feature_check = $(eval $(feature_check_code))
	define feature_check_code
	feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C config/feature-checks test-$1.bin >/dev/null 2>/dev/null && echo 1 \|\| echo 0)
	endef

	feature_set = $(eval $(feature_set_code))
	define feature_set_code
	feature-$(1) := 1
	endef

	#
	# Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
	#

	#
	# Note that this is not a complete list of all feature tests, just
	# those that are typically built on a fully configured system.
	#
	# [ Feature tests not mentioned here have to be built explicitly in
	# the rule that uses them - an example for that is the 'bionic'
	# feature check. ]
	#
	CORE_FEATURE_TESTS = \
	backtrace \
	dwarf \
	fortify-source \
	glibc \
	gtk2 \
	gtk2-infobar \
	libaudit \
	libbfd \
	libelf \
	libelf-getphdrnum \
	libelf-mmap \
	libnuma \
	libperl \
	libpython \
	libpython-version \
	libslang \
	libunwind \
	on-exit \
	stackprotector-all \
	timerfd \
	libdw-dwarf-unwind

	LIB_FEATURE_TESTS = \
	dwarf \
	glibc \
	gtk2 \
	libaudit \
	libbfd \
	libelf \
	libnuma \
	libperl \
	libpython \
	libslang \
	libunwind \
	libdw-dwarf-unwind

	VF_FEATURE_TESTS = \
	backtrace \
	fortify-source \
	gtk2-infobar \
	libelf-getphdrnum \
	libelf-mmap \
	libpython-version \
	on-exit \
	stackprotector-all \
	timerfd \
	libunwind-debug-frame \
	bionic

	# Set FEATURE_CHECK_(C\|LD)FLAGS-all for all CORE_FEATURE_TESTS features.
	# If in the future we need per-feature checks/flags for features not
	# mentioned in this list we need to refactor this ;-).
	set_test_all_flags = $(eval $(set_test_all_flags_code))
	define set_test_all_flags_code
	FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
	FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
	endef

	$(foreach feat,$(CORE_FEATURE_TESTS),$(call set_test_all_flags,$(feat)))

	#
	# Special fast-path for the 'all features are available' case:
	#
	$(call feature_check,all,$(MSG))

	#
	# Just in case the build freshly failed, make sure we print the
	# feature matrix:
	#
	ifeq ($(feature-all), 1)
	#
	# test-all.c passed - just set all the core feature flags to 1:
	#
	$(foreach feat,$(CORE_FEATURE_TESTS),$(call feature_set,$(feat)))
	else
	$(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS)" LDFLAGS=$(LDFLAGS) -i -j -C config/feature-checks $(addsuffix .bin,$(CORE_FEATURE_TESTS)) >/dev/null 2>&1)
	$(foreach feat,$(CORE_FEATURE_TESTS),$(call feature_check,$(feat)))
	endif

	ifeq ($(feature-stackprotector-all), 1)
	CFLAGS += -fstack-protector-all
	endif

	ifeq ($(DEBUG),0)
	ifeq ($(feature-fortify-source), 1)
	CFLAGS += -D_FORTIFY_SOURCE=2
	endif
	endif

	CFLAGS += -I$(src-perf)/util/include
	CFLAGS += -I$(src-perf)/arch/$(ARCH)/include
	CFLAGS += -I$(srctree)/tools/include/
	CFLAGS += -I$(srctree)/arch/$(ARCH)/include/uapi
	CFLAGS += -I$(srctree)/arch/$(ARCH)/include
	CFLAGS += -I$(srctree)/include/uapi
	CFLAGS += -I$(srctree)/include

	# $(obj-perf) for generated common-cmds.h
	# $(obj-perf)/util for generated bison/flex headers
	ifneq ($(OUTPUT),)
	CFLAGS += -I$(obj-perf)/util
	CFLAGS += -I$(obj-perf)
	endif

	CFLAGS += -I$(src-perf)/util
	CFLAGS += -I$(src-perf)
	CFLAGS += -I$(LIB_INCLUDE)

	CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE

	ifndef NO_BIONIC
	$(call feature_check,bionic)
	ifeq ($(feature-bionic), 1)
	BIONIC := 1
	EXTLIBS := $(filter-out -lrt,$(EXTLIBS))
	EXTLIBS := $(filter-out -lpthread,$(EXTLIBS))
	endif
	endif

	ifdef NO_LIBELF
	NO_DWARF := 1
	NO_DEMANGLE := 1
	NO_LIBUNWIND := 1
	NO_LIBDW_DWARF_UNWIND := 1
	else
	ifeq ($(feature-libelf), 0)
	ifeq ($(feature-glibc), 1)
	LIBC_SUPPORT := 1
	endif
	ifeq ($(BIONIC),1)
	LIBC_SUPPORT := 1
	endif
	ifeq ($(LIBC_SUPPORT),1)
	msg := $(warning No libelf found, disables 'probe' tool, please install elfutils-libelf-devel/libelf-dev);

	NO_LIBELF := 1
	NO_DWARF := 1
	NO_DEMANGLE := 1
	else
	msg := $(error No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static);
	endif
	else
	ifndef NO_LIBDW_DWARF_UNWIND
	ifneq ($(feature-libdw-dwarf-unwind),1)
	NO_LIBDW_DWARF_UNWIND := 1
	msg := $(warning No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR);
	endif
	endif
	ifneq ($(feature-dwarf), 1)
	msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev);
	NO_DWARF := 1
	endif # Dwarf support
	endif # libelf support
	endif # NO_LIBELF

	ifndef NO_LIBELF
	CFLAGS += -DHAVE_LIBELF_SUPPORT

	ifeq ($(feature-libelf-mmap), 1)
	CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
	endif

	ifeq ($(feature-libelf-getphdrnum), 1)
	CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
	endif

	# include ARCH specific config
	-include $(src-perf)/arch/$(ARCH)/Makefile

	ifndef NO_DWARF
	ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined)
	msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled);
	NO_DWARF := 1
	else
	CFLAGS += -DHAVE_DWARF_SUPPORT $(LIBDW_CFLAGS)
	LDFLAGS += $(LIBDW_LDFLAGS)
	EXTLIBS += -lelf -ldw
	endif # PERF_HAVE_DWARF_REGS
	endif # NO_DWARF
	endif # NO_LIBELF

	ifndef NO_LIBUNWIND
	ifneq ($(feature-libunwind), 1)
	msg := $(warning No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
	NO_LIBUNWIND := 1
	endif
	endif

	dwarf-post-unwind := 1
	dwarf-post-unwind-text := BUG

	# setup DWARF post unwinder
	ifdef NO_LIBUNWIND
	ifdef NO_LIBDW_DWARF_UNWIND
	msg := $(warning Disabling post unwind, no support found.);
	dwarf-post-unwind := 0
	else
	dwarf-post-unwind-text := libdw
	endif
	else
	dwarf-post-unwind-text := libunwind
	# Enable libunwind support by default.
	ifndef NO_LIBDW_DWARF_UNWIND
	NO_LIBDW_DWARF_UNWIND := 1
	endif
	endif

	ifeq ($(dwarf-post-unwind),1)
	CFLAGS += -DHAVE_DWARF_UNWIND_SUPPORT
	else
	NO_DWARF_UNWIND := 1
	endif

	ifndef NO_LIBUNWIND
	ifeq ($(ARCH),arm)
	$(call feature_check,libunwind-debug-frame)
	ifneq ($(feature-libunwind-debug-frame), 1)
	msg := $(warning No debug_frame support found in libunwind);
	CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
	endif
	else
	# non-ARM has no dwarf_find_debug_frame() function:
	CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
	endif
	CFLAGS += -DHAVE_LIBUNWIND_SUPPORT
	EXTLIBS += $(LIBUNWIND_LIBS)
	CFLAGS += $(LIBUNWIND_CFLAGS)
	LDFLAGS += $(LIBUNWIND_LDFLAGS)
	endif

	ifndef NO_LIBAUDIT
	ifneq ($(feature-libaudit), 1)
	msg := $(warning No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev);
	NO_LIBAUDIT := 1
	else
	CFLAGS += -DHAVE_LIBAUDIT_SUPPORT
	EXTLIBS += -laudit
	endif
	endif

	ifdef NO_NEWT
	NO_SLANG=1
	endif

	ifndef NO_SLANG
	ifneq ($(feature-libslang), 1)
	msg := $(warning slang not found, disables TUI support. Please install slang-devel or libslang-dev);
	NO_SLANG := 1
	else
	# Fedora has /usr/include/slang/slang.h, but ubuntu /usr/include/slang.h
	CFLAGS += -I/usr/include/slang
	CFLAGS += -DHAVE_SLANG_SUPPORT
	EXTLIBS += -lslang
	endif
	endif

	ifndef NO_GTK2
	FLAGS_GTK2=$(CFLAGS) $(LDFLAGS) $(EXTLIBS) $(shell $(PKG_CONFIG) --libs --cflags gtk+-2.0 2>/dev/null)
	ifneq ($(feature-gtk2), 1)
	msg := $(warning GTK2 not found, disables GTK2 support. Please install gtk2-devel or libgtk2.0-dev);
	NO_GTK2 := 1
	else
	ifeq ($(feature-gtk2-infobar), 1)
	GTK_CFLAGS := -DHAVE_GTK_INFO_BAR_SUPPORT
	endif
	CFLAGS += -DHAVE_GTK2_SUPPORT
	GTK_CFLAGS += $(shell $(PKG_CONFIG) --cflags gtk+-2.0 2>/dev/null)
	GTK_LIBS := $(shell $(PKG_CONFIG) --libs gtk+-2.0 2>/dev/null)
	EXTLIBS += -ldl
	endif
	endif

	grep-libs = $(filter -l%,$(1))
	strip-libs = $(filter-out -l%,$(1))

	ifdef NO_LIBPERL
	CFLAGS += -DNO_LIBPERL
	else
	PERL_EMBED_LDOPTS = $(shell perl -MExtUtils::Embed -e ldopts 2>/dev/null)
	PERL_EMBED_LDFLAGS = $(call strip-libs,$(PERL_EMBED_LDOPTS))
	PERL_EMBED_LIBADD = $(call grep-libs,$(PERL_EMBED_LDOPTS))
	PERL_EMBED_CCOPTS = `perl -MExtUtils::Embed -e ccopts 2>/dev/null`
	FLAGS_PERL_EMBED=$(PERL_EMBED_CCOPTS) $(PERL_EMBED_LDOPTS)

	ifneq ($(feature-libperl), 1)
	CFLAGS += -DNO_LIBPERL
	NO_LIBPERL := 1
	else
	LDFLAGS += $(PERL_EMBED_LDFLAGS)
	EXTLIBS += $(PERL_EMBED_LIBADD)
	endif
	endif

	ifeq ($(feature-timerfd), 1)
	CFLAGS += -DHAVE_TIMERFD_SUPPORT
	else
	msg := $(warning No timerfd support. Disables 'perf kvm stat live');
	endif

	disable-python = $(eval $(disable-python_code))
	define disable-python_code
	CFLAGS += -DNO_LIBPYTHON
	$(if $(1),$(warning No $(1) was found))
	$(warning Python support will not be built)
	NO_LIBPYTHON := 1
	endef

	override PYTHON := \
	$(call get-executable-or-default,PYTHON,python)

	ifndef PYTHON
	$(call disable-python,python interpreter)
	else

	PYTHON_WORD := $(call shell-wordify,$(PYTHON))

	ifdef NO_LIBPYTHON
	$(call disable-python)
	else

	override PYTHON_CONFIG := \
	$(call get-executable-or-default,PYTHON_CONFIG,$(PYTHON)-config)

	ifndef PYTHON_CONFIG
	$(call disable-python,python-config tool)
	else

	PYTHON_CONFIG_SQ := $(call shell-sq,$(PYTHON_CONFIG))

	PYTHON_EMBED_LDOPTS := $(shell $(PYTHON_CONFIG_SQ) --ldflags 2>/dev/null)
	PYTHON_EMBED_LDFLAGS := $(call strip-libs,$(PYTHON_EMBED_LDOPTS))
	PYTHON_EMBED_LIBADD := $(call grep-libs,$(PYTHON_EMBED_LDOPTS))
	PYTHON_EMBED_CCOPTS := $(shell $(PYTHON_CONFIG_SQ) --cflags 2>/dev/null)
	FLAGS_PYTHON_EMBED := $(PYTHON_EMBED_CCOPTS) $(PYTHON_EMBED_LDOPTS)

	ifneq ($(feature-libpython), 1)
	$(call disable-python,Python.h (for Python 2.x))
	else

	ifneq ($(feature-libpython-version), 1)
	$(warning Python 3 is not yet supported; please set)
	$(warning PYTHON and/or PYTHON_CONFIG appropriately.)
	$(warning If you also have Python 2 installed, then)
	$(warning try something like:)
	$(warning $(and ,))
	$(warning $(and ,) make PYTHON=python2)
	$(warning $(and ,))
	$(warning Otherwise, disable Python support entirely:)
	$(warning $(and ,))
	$(warning $(and ,) make NO_LIBPYTHON=1)
	$(warning $(and ,))
	$(error $(and ,))
	else
	LDFLAGS += $(PYTHON_EMBED_LDFLAGS)
	EXTLIBS += $(PYTHON_EMBED_LIBADD)
	LANG_BINDINGS += $(obj-perf)python/perf.so
	endif
	endif
	endif
	endif
	endif

	ifeq ($(feature-libbfd), 1)
	EXTLIBS += -lbfd
	endif

	ifdef NO_DEMANGLE
	CFLAGS += -DNO_DEMANGLE
	else
	ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
	EXTLIBS += -liberty
	CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
	else
	ifneq ($(feature-libbfd), 1)
	$(call feature_check,liberty)
	ifeq ($(feature-liberty), 1)
	EXTLIBS += -lbfd -liberty
	else
	$(call feature_check,liberty-z)
	ifeq ($(feature-liberty-z), 1)
	EXTLIBS += -lbfd -liberty -lz
	else
	$(call feature_check,cplus-demangle)
	ifeq ($(feature-cplus-demangle), 1)
	EXTLIBS += -liberty
	CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
	else
	msg := $(warning No bfd.h/libbfd found, install binutils-dev[el]/zlib-static to gain symbol demangling)
	CFLAGS += -DNO_DEMANGLE
	endif
	endif
	endif
	endif
	endif
	endif

	ifneq ($(filter -lbfd,$(EXTLIBS)),)
	CFLAGS += -DHAVE_LIBBFD_SUPPORT
	endif

	ifndef NO_ON_EXIT
	ifeq ($(feature-on-exit), 1)
	CFLAGS += -DHAVE_ON_EXIT_SUPPORT
	endif
	endif

	ifndef NO_BACKTRACE
	ifeq ($(feature-backtrace), 1)
	CFLAGS += -DHAVE_BACKTRACE_SUPPORT
	endif
	endif

	ifndef NO_LIBNUMA
	ifeq ($(feature-libnuma), 0)
	msg := $(warning No numa.h found, disables 'perf bench numa mem' benchmark, please install numactl-devel/libnuma-devel/libnuma-dev);
	NO_LIBNUMA := 1
	else
	CFLAGS += -DHAVE_LIBNUMA_SUPPORT
	EXTLIBS += -lnuma
	endif
	endif

	# Among the variables below, these:
	# perfexecdir
	# template_dir
	# mandir
	# infodir
	# htmldir
	# ETC_PERFCONFIG (but not sysconfdir)
	# can be specified as a relative path some/where/else;
	# this is interpreted as relative to $(prefix) and "perf" at
	# runtime figures out where they are based on the path to the executable.
	# This can help installing the suite in a relocatable way.

	# Make the path relative to DESTDIR, not to prefix
	ifndef DESTDIR
	prefix = $(HOME)
	endif
	bindir_relative = bin
	bindir = $(prefix)/$(bindir_relative)
	mandir = share/man
	infodir = share/info
	perfexecdir = libexec/perf-core
	sharedir = $(prefix)/share
	template_dir = share/perf-core/templates
	htmldir = share/doc/perf-doc
	ifeq ($(prefix),/usr)
	sysconfdir = /etc
	ETC_PERFCONFIG = $(sysconfdir)/perfconfig
	else
	sysconfdir = $(prefix)/etc
	ETC_PERFCONFIG = etc/perfconfig
	endif
	ifeq ($(IS_X86_64),1)
	lib = lib64
	else
	lib = lib
	endif
	libdir = $(prefix)/$(lib)

	# Shell quote (do not use $(call) to accommodate ancient setups);
	ETC_PERFCONFIG_SQ = $(subst ','\'',$(ETC_PERFCONFIG))
	DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
	bindir_SQ = $(subst ','\'',$(bindir))
	mandir_SQ = $(subst ','\'',$(mandir))
	infodir_SQ = $(subst ','\'',$(infodir))
	perfexecdir_SQ = $(subst ','\'',$(perfexecdir))
	template_dir_SQ = $(subst ','\'',$(template_dir))
	htmldir_SQ = $(subst ','\'',$(htmldir))
	prefix_SQ = $(subst ','\'',$(prefix))
	sysconfdir_SQ = $(subst ','\'',$(sysconfdir))
	libdir_SQ = $(subst ','\'',$(libdir))

	ifneq ($(filter /%,$(firstword $(perfexecdir))),)
	perfexec_instdir = $(perfexecdir)
	else
	perfexec_instdir = $(prefix)/$(perfexecdir)
	endif
	perfexec_instdir_SQ = $(subst ','\'',$(perfexec_instdir))

	# If we install to $(HOME) we keep the traceevent default:
	# $(HOME)/.traceevent/plugins
	# Otherwise we install plugins into the global $(libdir).
	ifdef DESTDIR
	plugindir=$(libdir)/traceevent/plugins
	plugindir_SQ= $(subst ','\'',$(plugindir))
	endif

	#
	# Print the result of the feature test:
	#
	feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))

	define feature_print_status_code
	ifeq ($(feature-$(1)), 1)
	MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
	else
	MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
	endif
	endef

	feature_print_var = $(eval $(feature_print_var_code)) $(info $(MSG))
	define feature_print_var_code
	MSG = $(shell printf '...%30s: %s' $(1) $($(1)))
	endef

	feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
	define feature_print_text_code
	MSG = $(shell printf '...%30s: %s' $(1) $(2))
	endef

	PERF_FEATURES := $(foreach feat,$(LIB_FEATURE_TESTS),feature-$(feat)($(feature-$(feat))))
	PERF_FEATURES_FILE := $(shell touch $(OUTPUT)PERF-FEATURES; cat $(OUTPUT)PERF-FEATURES)

	ifeq ($(dwarf-post-unwind),1)
	PERF_FEATURES += dwarf-post-unwind($(dwarf-post-unwind-text))
	endif

	# The $(display_lib) controls the default detection message
	# output. It's set if:
	# - detected features differes from stored features from
	# last build (in PERF-FEATURES file)
	# - one of the $(LIB_FEATURE_TESTS) is not detected
	# - VF is enabled

	ifneq ("$(PERF_FEATURES)","$(PERF_FEATURES_FILE)")
	$(shell echo "$(PERF_FEATURES)" > $(OUTPUT)PERF-FEATURES)
	display_lib := 1
	endif

	feature_check = $(eval $(feature_check_code))
	define feature_check_code
	ifneq ($(feature-$(1)), 1)
	display_lib := 1
	endif
	endef

	$(foreach feat,$(LIB_FEATURE_TESTS),$(call feature_check,$(feat)))

	ifeq ($(VF),1)
	display_lib := 1
	display_vf := 1
	endif

	ifeq ($(display_lib),1)
	$(info )
	$(info Auto-detecting system features:)
	$(foreach feat,$(LIB_FEATURE_TESTS),$(call feature_print_status,$(feat),))

	ifeq ($(dwarf-post-unwind),1)
	$(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
	endif
	endif

	ifeq ($(display_vf),1)
	$(foreach feat,$(VF_FEATURE_TESTS),$(call feature_print_status,$(feat),))
	$(info )
	$(call feature_print_var,prefix)
	$(call feature_print_var,bindir)
	$(call feature_print_var,libdir)
	$(call feature_print_var,sysconfdir)
	$(call feature_print_var,LIBUNWIND_DIR)
	$(call feature_print_var,LIBDW_DIR)
	endif

	ifeq ($(display_lib),1)
	$(info )
	endif