From 0fe01ebec7dec012a838e6c7394e727c3842dd09 Mon Sep 17 00:00:00 2001
From: David Laban <alsuren@gmail.com>
Date: Thu, 20 Mar 2025 13:33:21 +0000
Subject: [PATCH 1/2] basic no_std support, as long as you avoid Text and Data
 and List

---
 capnp_conv_macros/src/generators.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/capnp_conv_macros/src/generators.rs b/capnp_conv_macros/src/generators.rs
index 2c4b0b9..b35dc1b 100644
--- a/capnp_conv_macros/src/generators.rs
+++ b/capnp_conv_macros/src/generators.rs
@@ -571,7 +571,7 @@ fn generate_try_from_impl(
     let capnp_generics: Vec<Ident> = generics.iter().map(to_capnp_generic).collect();
     quote! {
       impl<'a, #(#generics, #capnp_generics),*>
-      ::std::convert::TryFrom<#capnp_path::Reader<'a, #(#capnp_generics),*>>
+      ::core::convert::TryFrom<#capnp_path::Reader<'a, #(#capnp_generics),*>>
       for #rust_name<#(#generics),*>
       where
         #(#generics: ::capnp_conv::Readable<OwnedType = #capnp_generics>,)*

From 45434627ab858048a90809ce7bfb919d649a18ce Mon Sep 17 00:00:00 2001
From: David Laban <alsuren@gmail.com>
Date: Thu, 20 Mar 2025 16:54:32 +0000
Subject: [PATCH 2/2] tweaks after trying it in my esp_hal based project

---
 Cargo.toml            | 2 +-
 capnp_conv/Cargo.toml | 4 ++++
 capnp_conv/src/lib.rs | 3 +++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index e092ff2..c793104 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ readme = "README.md"
 capnp_conv = { path = "capnp_conv", version = "0.3.1" }
 capnp_conv_macros = { path = "capnp_conv_macros", version = "0.3.1" }
 
-capnp = "0.20"
+capnp = { "version" = "0.20", default-features = false }
 capnpc = "0.20"
 heck = "0.5"
 proc-macro2 = "1.0"
diff --git a/capnp_conv/Cargo.toml b/capnp_conv/Cargo.toml
index b70506f..db0b592 100644
--- a/capnp_conv/Cargo.toml
+++ b/capnp_conv/Cargo.toml
@@ -11,3 +11,7 @@ readme.workspace = true
 capnp_conv_macros.workspace = true
 
 capnp.workspace = true
+
+[features]
+default = ["std"]
+std = ["capnp/default"]
diff --git a/capnp_conv/src/lib.rs b/capnp_conv/src/lib.rs
index 286da12..ecf3c41 100644
--- a/capnp_conv/src/lib.rs
+++ b/capnp_conv/src/lib.rs
@@ -1,5 +1,8 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+
 use capnp::{traits::Owned, Result};
 pub use capnp_conv_macros::capnp_conv;
+use core::marker::Sized;
 
 pub trait Writable {
     type OwnedType: Owned;