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-rw-r--r--generator/nanopb.proto2
1 files changed, 2 insertions, 0 deletions
diff --git a/generator/nanopb.proto b/generator/nanopb.proto
index 7b73c7b3..fe564b5c 100644
--- a/generator/nanopb.proto
+++ b/generator/nanopb.proto
@@ -33,6 +33,8 @@ message NanoPBOptions {
optional bool long_names = 4 [default = true];
// Add 'packed' attribute to generated structs.
+ // Note: this cannot be used on CPUs that break on unaligned
+ // accesses to variables.
optional bool packed_struct = 5 [default = false];
}