make/lib_platforms.mk

   1 # compiler-rt Configuration Support
   2 #
   3 # This should be included following 'lib_util.mk'.
   4
   5 # The simple variables configurations can define.
   6 PlainConfigVariables := Configs Description
   7 PerConfigVariables := UniversalArchs Arch $(AvailableOptions)
   8 RequiredConfigVariables := Configs Description
   9
  10 ###
  11 # Load Platforms
  12
  13 # Template: subdir_traverse_template subdir
  14 define load_platform_template
  15 $(call Set,PlatformName,$(basename $(notdir $(1))))
  16 ifneq ($(DEBUGMAKE),)
  17   $$(info MAKE: $(PlatformName): Loading platform)
  18 endif
  19
  20 # Construct the variable key for this directory.
  21 $(call Set,PlatformKey,Platform.$(PlatformName))
  22 $(call Append,PlatformKeys,$(PlatformKey))
  23 $(call Set,$(PlatformKey).Name,$(PlatformName))
  24 $(call Set,$(PlatformKey).Path,$(1))
  25
  26 # Reset platform specific variables to sentinel value.
  27 $$(foreach var,$(PlainConfigVariables) $(PerConfigVariables),\
  28   $$(call Set,$$(var),UNDEFINED))
  29 $$(foreach var,$(PerConfigVariables),\
  30   $$(foreach config,$$(Configs),\
  31     $$(call Set,$$(var).$$(config),UNDEFINED)))
  32 $$(foreach var,$(PerConfigVariables),\
  33   $$(foreach arch,$(AvailableArchs),\
  34     $$(call Set,$$(var).$$(arch),UNDEFINED)))
  35
  36 # Get the platform variables.
  37 include make/options.mk
  38 include $(1)
  39
  40 # Check for undefined required variables.
  41 $$(foreach var,$(RequiredConfigVariables),\
  42   $$(if $$(call strneq,UNDEFINED,$$($$(var))),, \
  43         $$(error $(Dir): variable '$$(var)' was not undefined)))
  44
  45 # Check that exactly one of UniversalArchs or Arch was defined.
  46 $$(if $$(and $$(call strneq,UNDEFINED,$$(UniversalArchs)),\
  47              $$(call strneq,UNDEFINED,$$(Arch))),\
  48     $$(error '$(1)': cannot define both 'UniversalArchs' and 'Arch'))
  49 $$(if $$(or $$(call strneq,UNDEFINED,$$(UniversalArchs)),\
  50             $$(call strneq,UNDEFINED,$$(Arch))),,\
  51     $$(error '$(1)': must define one of 'UniversalArchs' and 'Arch'))
  52
  53 # Collect all the platform variables for subsequent use.
  54 $$(foreach var,$(PlainConfigVariables) $(PerConfigVariables),\
  55   $$(if $$(call strneq,UNDEFINED,$$($$(var))),\
  56     $$(call CopyVariable,$$(var),$(PlatformKey).$$(var))))
  57 $$(foreach var,$(PerConfigVariables),\
  58   $$(foreach config,$$(Configs),\
  59     $$(if $$(call strneq,UNDEFINED,$$($$(var).$$(config))),\
  60       $$(call CopyVariable,$$(var).$$(config),$(PlatformKey).$$(var).$$(config))))\
  61   $$(foreach arch,$(AvailableArchs),\
  62     $$(if $$(call strneq,UNDEFINED,$$($$(var).$$(arch))),\
  63       $$(call CopyVariable,$$(var).$$(arch),$(PlatformKey).$$(var).$$(arch))))\
  64   $$(foreach config,$$(Configs),\
  65     $$(foreach arch,$(AvailableArchs),\
  66       $$(if $$(call strneq,UNDEFINED,$$($$(var).$$(config).$$(arch))),\
  67         $$(call CopyVariable,$$(var).$$(config).$$(arch),\
  68                 $(PlatformKey).$$(var).$$(config).$$(arch))))))
  69
  70 ifneq ($(DEBUGMAKE),)
  71   $$(info MAKE: $(PlatformName): Done loading platform)
  72 endif
  73 endef
  74
  75 # Evaluate this now so we do not have to worry about order of evaluation.
  76 PlatformFiles := $(wildcard make/platform/*.mk)
  77 ifneq ($(DEBUGMAKE),)
  78  $(info MAKE: Loading platforms: $(PlatformFiles))
  79 endif
  80
  81 $(foreach file,$(PlatformFiles),\
  82   $(eval $(call load_platform_template,$(file))))