[Refactor] derive hlslib location dynamically from env.var.

this will allow generated HLS ipgen folders to be executable outside
the container by setting up the FINN_ROOT env.var.

src/finn/custom_op/fpgadataflow/hlscustomop.py

@@ -300,8 +300,6 @@ class HLSCustomOp(CustomOp):
         self.code_gen_dict["$PROJECTNAME$"] = ["project_{}".format(node.name)]
         self.code_gen_dict["$HWSRCDIR$"] = [code_gen_dir]
         self.code_gen_dict["$FPGAPART$"] = [fpgapart]
-        self.code_gen_dict["$FINNHLSLIBDIR$"] = ["/workspace/finn-hlslib"]
-        self.code_gen_dict["$FINNHLSCUSTOMDIR$"] = ["/workspace/finn/custom_hls"]
         self.code_gen_dict["$TOPFXN$"] = [node.name]
         self.code_gen_dict["$CLKPERIOD$"] = [str(clk)]
         self.code_gen_dict["$DEFAULT_DIRECTIVES$"] = self.ipgen_default_directives()

src/finn/custom_op/fpgadataflow/templates.py

@@ -86,10 +86,10 @@ puts "HLS project: $config_proj_name"
 set config_hwsrcdir "$HWSRCDIR$"
 puts "HW source dir: $config_hwsrcdir"
 set config_proj_part "$FPGAPART$"
-
-set config_bnnlibdir "$FINNHLSLIBDIR$"
-set config_customhlsdir "$FINNHLSCUSTOMDIR$"
-
+set config_bnnlibdir "$::env(FINN_ROOT)/finn-hlslib"
+puts "finn-hlslib dir: $config_bnnlibdir"
+set config_customhlsdir "$::env(FINN_ROOT)/finn/custom_hls"
+puts "custom HLS dir: $config_customhlsdir"
 set config_toplevelfxn "$TOPFXN$"
 set config_clkperiod $CLKPERIOD$