From 8ba75e9774f24c60a435c9549a0197d88ea5a2d9 Mon Sep 17 00:00:00 2001
From: AztecBot <tech@aztec-labs.com>
Date: Tue, 3 Mar 2026 19:12:23 +0000
Subject: [PATCH 1/2] fix: add -g0 to zig presets to eliminate 11GB debug info
 bloat

---
 barretenberg/cpp/CMakePresets.json | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/barretenberg/cpp/CMakePresets.json b/barretenberg/cpp/CMakePresets.json
index d54ff10196f5..1c93da119ce7 100644
--- a/barretenberg/cpp/CMakePresets.json
+++ b/barretenberg/cpp/CMakePresets.json
@@ -41,7 +41,9 @@
       "binaryDir": "build",
       "environment": {
         "CC": "zig cc -target native-linux-gnu.2.35",
-        "CXX": "zig c++ -target native-linux-gnu.2.35"
+        "CXX": "zig c++ -target native-linux-gnu.2.35",
+        "CFLAGS": "-g0",
+        "CXXFLAGS": "-g0"
       },
       "cacheVariables": {
         "CMAKE_AR": "${sourceDir}/scripts/zig-ar.sh",
@@ -464,7 +466,9 @@
       "binaryDir": "${sourceDir}/build-${presetName}",
       "environment": {
         "CC": "zig cc",
-        "CXX": "zig c++"
+        "CXX": "zig c++",
+        "CFLAGS": "-g0",
+        "CXXFLAGS": "-g0"
       },
       "cacheVariables": {
         "ENABLE_PIC": "ON",

From b70cafefa619e2640fda3690ee6514f67e57a8d7 Mon Sep 17 00:00:00 2001
From: AztecBot <tech@aztec-labs.com>
Date: Tue, 3 Mar 2026 22:01:47 +0000
Subject: [PATCH 2/2] fix: unset CFLAGS/CXXFLAGS in LMDB ExternalProject build

The -g0 flags set in CMakePresets.json leak to LMDB's make -e build,
replacing its CFLAGS entirely (losing -O2, -pthread, -fPIC, etc).
This causes zig cc to insert UBSan instrumentation at -O0, leading
to undefined __ubsan_handle_* symbols at link time.

Fix by unsetting CFLAGS/CXXFLAGS in the cmake -E env wrapper so
LMDB uses its own Makefile-defined CFLAGS.
---
 barretenberg/cpp/cmake/lmdb.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/barretenberg/cpp/cmake/lmdb.cmake b/barretenberg/cpp/cmake/lmdb.cmake
index 1a25e8f5c90c..733ba27cca6e 100644
--- a/barretenberg/cpp/cmake/lmdb.cmake
+++ b/barretenberg/cpp/cmake/lmdb.cmake
@@ -15,7 +15,7 @@ ExternalProject_Add(
     SOURCE_DIR ${LMDB_PREFIX}/src/lmdb_repo
     BUILD_IN_SOURCE YES
     CONFIGURE_COMMAND "" # No configure step
-    BUILD_COMMAND ${CMAKE_COMMAND} -E env CC=${CMAKE_C_COMPILER}${CMAKE_C_COMPILER_ARG1} AR=${CMAKE_AR} make -e -C libraries/liblmdb XCFLAGS=-fPIC liblmdb.a
+    BUILD_COMMAND ${CMAKE_COMMAND} -E env --unset=CFLAGS --unset=CXXFLAGS CC=${CMAKE_C_COMPILER}${CMAKE_C_COMPILER_ARG1} AR=${CMAKE_AR} make -e -C libraries/liblmdb XCFLAGS=-fPIC liblmdb.a
     INSTALL_COMMAND ""
     UPDATE_COMMAND "" # No update step
     BUILD_BYPRODUCTS ${LMDB_LIB}