Refactor os and arch conditionals in Makefile

Prepare for adding another operating system for guestagents.

Correct some typos in the helper functions and documentation.

Signed-off-by: Anders F Björklund <[email protected]>

Author: afbjorklund

Makefile

@@ -80,10 +80,10 @@ help-targets:
 	@echo  '- helpers                   : Copy nerdctl.lima, apptainer.lima, docker.lima, podman.lima, and kubectl.lima'
 	@echo
 	@echo  'Targets for files in _output/share/lima/:'
-	@echo  '- guestagents               : Build guestagents for archs enabled by CONFIG_GUESTAGENT_ARCHS_*'
+	@echo  '- guestagents               : Build guestagents for archs enabled by CONFIG_GUESTAGENT_ARCH_*'
 	@echo  '- native-guestagent         : Build guestagent for native arch'
 	@echo  '- additional-guestagents    : Build guestagents for archs other than native arch'
-	@echo  '- <arch>-guestagent         : Build guestagent for <arch>: $(sort $(GUESTAGENT_ARCHS))'
+	@echo  '- <arch>-guestagent         : Build guestagent for <arch>: $(sort $(LINUX_GUESTAGENT_ARCHS))'
 	@echo
 	@echo  'Targets for files in _output/share/lima/templates/:'
 	@echo  '- templates                 : Copy templates'
@@ -256,27 +256,30 @@ LINUX_GUESTAGENT_PATH_COMMON = _output/share/lima/lima-guestagent.Linux-
 
 # How to add architecture specific guestagent:
 # 1. Add the architecture to GUESTAGENT_ARCHS
-# 2. Add ENVS_$(LINUX_GUESTAGENT_PATH_COMMON)<arch> to set GOOS, GOARCH, and other necessary environment variables
-GUESTAGENT_ARCHS = aarch64 armv7l riscv64 x86_64
+# 2. Add ENVS_$(*_GUESTAGENT_PATH_COMMON)<arch> to set GOOS, GOARCH, and other necessary environment variables
+LINUX_GUESTAGENT_ARCHS = aarch64 armv7l riscv64 x86_64
 
-ALL_GUESTAGENTS_NOT_COMPRESSED = $(addprefix $(LINUX_GUESTAGENT_PATH_COMMON),$(GUESTAGENT_ARCHS))
+ifeq ($(CONFIG_GUESTAGENT_OS_LINUX),y)
+ALL_GUESTAGENTS_NOT_COMPRESSED += $(addprefix $(LINUX_GUESTAGENT_PATH_COMMON),$(LINUX_GUESTAGENT_ARCHS))
+endif
 ifeq ($(CONFIG_GUESTAGENT_COMPRESS),y)
 $(info Guestagents are unzipped each time to check the build configuration; they may be gunzipped afterward.)
 gz=.gz
 endif
 
 ALL_GUESTAGENTS = $(addsuffix $(gz),$(ALL_GUESTAGENTS_NOT_COMPRESSED))
 
-# guestagent path for the given architectures. it may has .gz extension if CONFIG_GUESTAGENT_COMPRESS is enabled.
-# $(1): list of architectures
-guestaget_path = $(foreach arch,$(1),$(LINUX_GUESTAGENT_PATH_COMMON)$(arch)$(gz))
-
-NATIVE_GUESTAGENT_ARCH = $(shell uname -m | sed -e s/arm64/aarch64/)
-NATIVE_GUESTAGENT = $(call guestaget_path,$(NATIVE_GUESTAGENT_ARCH))
-ADDITIONAL_GUESTAGENT_ARCHS = $(filter-out $(NATIVE_GUESTAGENT_ARCH),$(GUESTAGENT_ARCHS))
-ADDITIONAL_GUESTAGENTS = $(call guestaget_path,$(ADDITIONAL_GUESTAGENT_ARCHS))
+# guestagent path for the given platform. it may has .gz extension if CONFIG_GUESTAGENT_COMPRESS is enabled.
+# $(1): operating system (os)
+# $(2): list of architectures
+guestagent_path = $(foreach arch,$(2),$($(1)_GUESTAGENT_PATH_COMMON)$(arch)$(gz))
 
 ifeq ($(CONFIG_GUESTAGENT_OS_LINUX),y)
+NATIVE_GUESTAGENT_ARCH = $(shell uname -m | sed -e s/arm64/aarch64/)
+NATIVE_GUESTAGENT = $(call guestagent_path,LINUX,$(NATIVE_GUESTAGENT_ARCH))
+ADDITIONAL_GUESTAGENT_ARCHS = $(filter-out $(NATIVE_GUESTAGENT_ARCH),$(LINUX_GUESTAGENT_ARCHS))
+ADDITIONAL_GUESTAGENTS = $(call guestagent_path,LINUX,$(ADDITIONAL_GUESTAGENT_ARCHS))
+endif
 
 # config_guestagent_arch returns expanded value of CONFIG_GUESTAGENT_ARCH_<arch>
 # $(1): architecture
@@ -285,18 +288,19 @@ config_guestagent_arch = $(filter y,$(CONFIG_GUESTAGENT_ARCH_$(shell echo $(1)|t
 
 # guestagent_path_enabled_by_config returns the path to the guestagent binary for the given architecture,
 # or an empty string if the CONFIG_GUESTAGENT_ARCH_<arch> is not set.
-guestagent_path_enabled_by_config = $(if $(call config_guestagent_arch,$(1)),$(call guestaget_path,$(1)))
+guestagent_path_enabled_by_config = $(if $(call config_guestagent_arch,$(2)),$(call guestagent_path,$(1),$(2)))
 
+ifeq ($(CONFIG_GUESTAGENT_OS_LINUX),y)
 # apply CONFIG_GUESTAGENT_ARCH_*
-GUESTAGENTS = $(foreach arch,$(GUESTAGENT_ARCHS),$(call guestagent_path_enabled_by_config,$(arch)))
+GUESTAGENTS += $(foreach arch,$(LINUX_GUESTAGENT_ARCHS),$(call guestagent_path_enabled_by_config,LINUX,$(arch)))
 endif
 
 .PHONY: guestagents native-guestagent additional-guestagents
 guestagents: $(GUESTAGENTS)
 native-guestagent: $(NATIVE_GUESTAGENT)
 additional-guestagents: $(ADDITIONAL_GUESTAGENTS)
 %-guestagent:
-	@[ "$(findstring $(*),$(GUESTAGENT_ARCHS))" == "$(*)" ] && make $(call guestaget_path,$*)
+	@[ "$(findstring $(*),$(LINUX_GUESTAGENT_ARCHS))" == "$(*)" ] && make $(call guestagent_path,LINUX,$*)
 
 # environment variables for linx-guestagent. these variable are used for checking force build.
 ENVS_$(LINUX_GUESTAGENT_PATH_COMMON)aarch64 = CGO_ENABLED=0 GOOS=linux GOARCH=arm64