variables: demonstrate migration path from make to tcl

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/Makefile

@@ -153,7 +153,15 @@ else
   $(error [ERROR][FLOW] Platform '$(PLATFORM)' not found.)
 endif
 
-include $(PLATFORM_DIR)/config.mk
+# The plan is to migrate all variables to .tcl so that
+# ORFS is no longer dependent on make.
+ifneq ($(wildcard $(PLATFORM_DIR)/config.tcl),)
+  # import variables defined in config.tcl to the make environment.
+  $(foreach line,$(shell tclsh $(SCRIPTS_DIR)/env.tcl $(PLATFORM_DIR)/config.tcl),$(eval $(line)))
+endif
+ifneq ($(wildcard $(PLATFORM_DIR)/config.mk),)
+  include $(PLATFORM_DIR)/config.mk
+endif
 
 # __SPACE__ is a workaround for whitespace hell in "foreach"; there
 # is no way to escape space in defaults.py and get "foreach" to work.

flow/platforms/asap7/config.mk

@@ -1,6 +1,3 @@
-export PLATFORM                = asap7
-export PROCESS                 = 7
-
 ifeq ($(LIB_MODEL),)
    export LIB_MODEL = NLDM
 endif

flow/platforms/asap7/config.tcl

@@ -0,0 +1,6 @@
+# ---------------------------------------------------------
+#  IR Drop
+# ---------------------------------------------------------
+
+set ::env(PLATFORM) asap7
+set ::env(PROCESS) 7

flow/scripts/env.tcl

@@ -0,0 +1,11 @@
+# Print out make variables that have changed so that
+# make can set them up.
+set envfile [lindex $argv 0]
+set env_vars [array get ::env]
+source $envfile
+
+foreach {var val} [array get ::env] {
+  if {![dict exists $env_vars $var] || [dict get $env_vars $var] ne $val} {
+    puts "export $var:=$val"
+  }
+}