[Makefile] conditional definition for MacOS

share/Makefile.common

@@ -147,13 +147,15 @@ eval last=\$${$$\#}; \
 mv $$new_temp $$last' sed_inplace
 SED	= LC_ALL=C sed
 RM	= rm -f
-ifeq ($(shell uname -s 2> /dev/null),Darwin)
+TOUCH   = touch
+GIT	= git
+
+ifeq ($(PLATFORM),MacOS)
 TAR     = gtar
 else
+# Unix, Cygwin
 TAR     = tar
 endif
-TOUCH   = touch
-GIT	= git
 
 ##################
 # Make commands #

share/Makefile.linting

@@ -66,7 +66,13 @@ MV      ?= mv
 RM      ?= rm -f
 RMDIR   ?= rm -rf
 TOUCH   ?= touch
+
+ifeq ($(PLATFORM),MacOS)
+XARGS   ?= xargs
+else
+# Unix, Cygwin
 XARGS   ?= xargs --no-run-if-empty
+endif
 
 ############
 

share/Makefile.testing

@@ -35,11 +35,17 @@ PTEST_DIRS?=$(PURGED_PTEST_DIRS)
 ############
 # Default values necessary for make -f <this-makefile>
 
-XARGS   ?= xargs --no-run-if-empty
 GREP    ?= grep
 RM      ?= rm -f
 RMDIR   ?= rm -rf
 
+ifeq ($(PLATFORM),MacOS)
+XARGS   ?= xargs
+else
+# Unix, Cygwin
+XARGS   ?= xargs --no-run-if-empty
+endif
+
 ##########################################################################
 
 # Defines the related dune targets