build: add a default build tar in depends

This is so we can override it later for BSDs.

depends/Makefile

@@ -182,7 +182,7 @@ $(host_prefix)/.stamp_$(final_build_id): $(native_packages) $(packages)
 	mkdir -p $(@D)
 	echo copying packages: $^
 	echo to: $(@D)
-	cd $(@D); $(foreach package,$^, tar xf $($(package)_cached); )
+	cd $(@D); $(foreach package,$^, $(build_TAR) xf $($(package)_cached); )
 	touch $@
 
 # $PATH is not preserved between ./configure and make by convention. Its

depends/builders/default.mk

@@ -1,6 +1,7 @@
 default_build_CC = gcc
 default_build_CXX = g++
 default_build_AR = ar
+default_build_TAR = tar
 default_build_RANLIB = ranlib
 default_build_STRIP = strip
 default_build_NM = nm
@@ -12,7 +13,7 @@ build_$(build_os)_$1 ?= $$(default_build_$1)
 build_$(build_arch)_$(build_os)_$1 ?= $$(build_$(build_os)_$1)
 build_$1=$$(build_$(build_arch)_$(build_os)_$1)
 endef
-$(foreach var,CC CXX AR RANLIB NM STRIP SHA256SUM DOWNLOAD OTOOL INSTALL_NAME_TOOL,$(eval $(call add_build_tool_func,$(var))))
+$(foreach var,CC CXX AR TAR RANLIB NM STRIP SHA256SUM DOWNLOAD OTOOL INSTALL_NAME_TOOL,$(eval $(call add_build_tool_func,$(var))))
 define add_build_flags_func
 build_$(build_arch)_$(build_os)_$1 += $(build_$(build_os)_$1)
 build_$1=$$(build_$(build_arch)_$(build_os)_$1)

depends/funcs.mk

@@ -84,7 +84,7 @@ $(1)_download_path_fixed=$(subst :,\:,$$($(1)_download_path))
 #default commands
 # The default behavior for tar will try to set ownership when running as uid 0 and may not succeed, --no-same-owner disables this behavior
 $(1)_fetch_cmds ?= $(call fetch_file,$(1),$(subst \:,:,$$($(1)_download_path_fixed)),$$($(1)_download_file),$($(1)_file_name),$($(1)_sha256_hash))
-$(1)_extract_cmds ?= mkdir -p $$($(1)_extract_dir) && echo "$$($(1)_sha256_hash)  $$($(1)_source)" > $$($(1)_extract_dir)/.$$($(1)_file_name).hash &&  $(build_SHA256SUM) -c $$($(1)_extract_dir)/.$$($(1)_file_name).hash && tar --no-same-owner --strip-components=1 -xf $$($(1)_source)
+$(1)_extract_cmds ?= mkdir -p $$($(1)_extract_dir) && echo "$$($(1)_sha256_hash)  $$($(1)_source)" > $$($(1)_extract_dir)/.$$($(1)_file_name).hash &&  $(build_SHA256SUM) -c $$($(1)_extract_dir)/.$$($(1)_file_name).hash && $(build_TAR) --no-same-owner --strip-components=1 -xf $$($(1)_source)
 $(1)_preprocess_cmds ?=
 $(1)_build_cmds ?=
 $(1)_config_cmds ?=
@@ -207,7 +207,7 @@ $($(1)_preprocessed): | $($(1)_extracted)
 	touch $$@
 $($(1)_configured): | $($(1)_dependencies) $($(1)_preprocessed)
 	echo Configuring $(1)...
-	rm -rf $(host_prefix); mkdir -p $(host_prefix)/lib; cd $(host_prefix); $(foreach package,$($(1)_all_dependencies), tar --no-same-owner -xf $($(package)_cached); )
+	rm -rf $(host_prefix); mkdir -p $(host_prefix)/lib; cd $(host_prefix); $(foreach package,$($(1)_all_dependencies), $(build_TAR) --no-same-owner -xf $($(package)_cached); )
 	mkdir -p $$(@D)
 	+cd $$(@D); $($(1)_config_env) $(call $(1)_config_cmds, $(1))
 	touch $$@
@@ -228,7 +228,7 @@ $($(1)_postprocessed): | $($(1)_staged)
 	touch $$@
 $($(1)_cached): | $($(1)_dependencies) $($(1)_postprocessed)
 	echo Caching $(1)...
-	cd $$($(1)_staging_dir)/$(host_prefix); find . | sort | tar --no-recursion -czf $$($(1)_staging_dir)/$$(@F) -T -
+	cd $$($(1)_staging_dir)/$(host_prefix); find . | sort | $(build_TAR) --no-recursion -czf $$($(1)_staging_dir)/$$(@F) -T -
 	mkdir -p $$(@D)
 	rm -rf $$(@D) && mkdir -p $$(@D)
 	mv $$($(1)_staging_dir)/$$(@F) $$(@)

depends/packages/qt.mk

@@ -201,11 +201,11 @@ define $(package)_extract_cmds
   echo "$($(package)_qttools_sha256_hash)  $($(package)_source_dir)/$($(package)_qttools_file_name)" >> $($(package)_extract_dir)/.$($(package)_file_name).hash && \
   $(build_SHA256SUM) -c $($(package)_extract_dir)/.$($(package)_file_name).hash && \
   mkdir qtbase && \
-  tar --no-same-owner --strip-components=1 -xf $($(package)_source) -C qtbase && \
+  $(build_TAR) --no-same-owner --strip-components=1 -xf $($(package)_source) -C qtbase && \
   mkdir qttranslations && \
-  tar --no-same-owner --strip-components=1 -xf $($(package)_source_dir)/$($(package)_qttranslations_file_name) -C qttranslations && \
+  $(build_TAR) --no-same-owner --strip-components=1 -xf $($(package)_source_dir)/$($(package)_qttranslations_file_name) -C qttranslations && \
   mkdir qttools && \
-  tar --no-same-owner --strip-components=1 -xf $($(package)_source_dir)/$($(package)_qttools_file_name) -C qttools
+  $(build_TAR) --no-same-owner --strip-components=1 -xf $($(package)_source_dir)/$($(package)_qttools_file_name) -C qttools
 endef
 
 # Preprocessing steps work as follows: