From b6ce2f0f47452ad9ff92b871a3f2283d6e774604 Mon Sep 17 00:00:00 2001
From: Joe Caulfield <jcaulfield135@gmail.com>
Date: Wed, 8 Oct 2025 02:38:51 +0000
Subject: [PATCH] harness: put precompile libs behind feature flag

---
 harness/Cargo.toml     |  3 ++-
 harness/src/lib.rs     | 21 ++++++++++++++++++++-
 harness/src/program.rs | 10 ++++++++++
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/harness/Cargo.toml b/harness/Cargo.toml
index 03302e7d..4ecc56c4 100644
--- a/harness/Cargo.toml
+++ b/harness/Cargo.toml
@@ -25,6 +25,7 @@ fuzz-fd = [
     "dep:mollusk-svm-fuzz-fs",
 ]
 invocation-inspect-callback = []
+precompiles = ["dep:agave-precompiles"]
 serde = [
     "dep:serde",
     "mollusk-svm-result/serde",
@@ -32,7 +33,7 @@ serde = [
 
 [dependencies]
 agave-feature-set = { workspace = true }
-agave-precompiles = { workspace = true }
+agave-precompiles = { workspace = true, optional = true }
 agave-syscalls = { workspace = true }
 bincode = { workspace = true }
 serde = { workspace = true, features = ["derive"], optional = true }
diff --git a/harness/src/lib.rs b/harness/src/lib.rs
index 4dde365b..b55aa8fb 100644
--- a/harness/src/lib.rs
+++ b/harness/src/lib.rs
@@ -452,6 +452,8 @@ pub mod sysvar;
 pub use mollusk_svm_result as result;
 #[cfg(any(feature = "fuzz", feature = "fuzz-fd"))]
 use mollusk_svm_result::Compare;
+#[cfg(feature = "precompiles")]
+use solana_precompile_error::PrecompileError;
 #[cfg(feature = "invocation-inspect-callback")]
 use solana_transaction_context::InstructionAccount;
 use {
@@ -466,7 +468,6 @@ use {
     solana_compute_budget::compute_budget::ComputeBudget,
     solana_hash::Hash,
     solana_instruction::{AccountMeta, Instruction},
-    solana_precompile_error::PrecompileError,
     solana_program_runtime::invoke_context::{EnvironmentConfig, InvokeContext},
     solana_pubkey::Pubkey,
     solana_svm_callback::InvokeContextCallback,
@@ -579,6 +580,7 @@ impl CheckContext for Mollusk {
 }
 
 struct MolluskInvokeContextCallback<'a> {
+    #[cfg_attr(not(feature = "precompiles"), allow(dead_code))]
     feature_set: &'a FeatureSet,
     epoch_stake: &'a EpochStake,
 }
@@ -592,12 +594,19 @@ impl InvokeContextCallback for MolluskInvokeContextCallback<'_> {
         self.epoch_stake.get(vote_address).copied().unwrap_or(0)
     }
 
+    #[cfg(feature = "precompiles")]
     fn is_precompile(&self, program_id: &Pubkey) -> bool {
         agave_precompiles::is_precompile(program_id, |feature_id| {
             self.feature_set.is_active(feature_id)
         })
     }
 
+    #[cfg(not(feature = "precompiles"))]
+    fn is_precompile(&self, _program_id: &Pubkey) -> bool {
+        false
+    }
+
+    #[cfg(feature = "precompiles")]
     fn process_precompile(
         &self,
         program_id: &Pubkey,
@@ -612,6 +621,16 @@ impl InvokeContextCallback for MolluskInvokeContextCallback<'_> {
             Err(PrecompileError::InvalidPublicKey)
         }
     }
+
+    #[cfg(not(feature = "precompiles"))]
+    fn process_precompile(
+        &self,
+        _program_id: &Pubkey,
+        _data: &[u8],
+        _instruction_datas: Vec<&[u8]>,
+    ) -> Result<(), solana_precompile_error::PrecompileError> {
+        panic!("precompiles feature not enabled");
+    }
 }
 
 impl Mollusk {
diff --git a/harness/src/program.rs b/harness/src/program.rs
index 7187b5c2..93c8f7ff 100644
--- a/harness/src/program.rs
+++ b/harness/src/program.rs
@@ -31,6 +31,7 @@ pub mod loader_keys {
     };
 }
 
+#[cfg(feature = "precompiles")]
 pub mod precompile_keys {
     use solana_pubkey::Pubkey;
     pub use solana_sdk_ids::{
@@ -46,6 +47,15 @@ pub mod precompile_keys {
     }
 }
 
+#[cfg(not(feature = "precompiles"))]
+pub mod precompile_keys {
+    use solana_pubkey::Pubkey;
+
+    pub(crate) fn is_precompile(_program_id: &Pubkey) -> bool {
+        false
+    }
+}
+
 pub struct ProgramCache {
     cache: Rc<RefCell<ProgramCacheForTxBatch>>,
     // This stinks, but the `ProgramCacheForTxBatch` doesn't offer a way to