Suppress warnings for unused variables using a compiler option

Currently, the generated code suppresses warnings for unusued variables
by assigning to the "_Val" variable, for example:

  _Val = Tmpval5

To be completely safe, that should have been:

  _ = Tmpval5

in case there happens to more than one such assignment in the same
scope.

However, a better way to suppress warnings is to simply use the
'nowarn_unused_vars' compiler option. That method will also work
for more complicated expressions there it would be cumbersome to
suppress warnings by assignment to "_".

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/asn1/src/asn1ct_gen.erl b/lib/asn1/src/asn1ct_gen.erl
index b0990e92cf..57b12ce186 100644
--- a/lib/asn1/src/asn1ct_gen.erl
+++ b/lib/asn1/src/asn1ct_gen.erl
@@ -1405,7 +1405,7 @@ gen_head(Erules,Mod,Hrl) ->
     emit({"%% Purpose: encoder and decoder to the types in mod ",Mod,nl,nl}),
     emit({"-module('",Mod,"').",nl}),
     put(currmod,Mod),
-    %emit({"-compile(export_all).",nl}),
+    emit({"-compile(nowarn_unused_vars).",nl}),
     case {Hrl,lists:member(inline,get(encoding_options))} of
 	{0,_} -> true;
 	{_,true} -> true;