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  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
  
  # 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
  
  # 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)))
  
  #
  # So here we detect whether test-all was rebuilt, to be able
  # to skip the print-out of the long features list if the file
  # existed before and after it was built:
  #
  ifeq ($(wildcard $(OUTPUT)config/feature-checks/test-all.bin),)
    test-all-failed := 1
  else
    test-all-failed := 0
  endif
  
  #
  # 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), 0)
    test-all-failed := 1
  endif
  
  ifeq ($(test-all-failed),1)
    $(info )
    $(info Auto-detecting system features:)
  endif
  
  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
  
  #
  # Print the result of the feature test:
  #
  feature_print = $(eval $(feature_print_code)) $(info $(MSG))
  
  define feature_print_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
  
  #
  # Only print out our features if we rebuilt the testcases or if a test failed:
  #
  ifeq ($(test-all-failed), 1)
    $(foreach feat,$(CORE_FEATURE_TESTS),$(call feature_print,$(feat)))
    $(info )
  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
  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 := $(error No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static);
      endif
    else
      # for linking with debug library, run like:
      # make DEBUG=1 LIBDW_DIR=/opt/libdw/
      ifdef LIBDW_DIR
        LIBDW_CFLAGS  := -I$(LIBDW_DIR)/include
        LIBDW_LDFLAGS := -L$(LIBDW_DIR)/lib
      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 := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1);
      NO_LIBUNWIND := 1
    else
      ifeq ($(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 += $(LIBUNWIND_LDFLAGS)
    endif # ifneq ($(feature-libunwind), 1)
  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 -lz -liberty
  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