diff --git a/flake.nix b/flake.nix
index 0052327..cd9226a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -294,6 +294,7 @@ rec {
 
           nativeBuildInputs = with pkgs; [cmake];
 
+          dontStrip = true;
           cmakeBuildType = buildtype;
           cmakeFlags =
             extraCmakeFlags
@@ -322,7 +323,7 @@ rec {
         buildenv = i386_pkgs.stdenv;
         platform = "baremetal";
         buildtype = "Debug";
-        cflags = "-O0 -ggdb";
+        cflags = "-O0 -ggdb3";
         extraCmakeFlags = [
           "-DCMAKE_SYSTEM_NAME=Generic"
           "-DCMAKE_SYSTEM_PROCESSOR=i386"
@@ -332,8 +333,8 @@ rec {
       libiwasm-baremetal-release = mkLibiwasm {
         buildenv = i386_pkgs.stdenv;
         platform = "baremetal";
-        buildtype = "Release";
-        cflags = "-O2 -ggdb -DNDEBUG";
+        buildtype = "MinSizeRel";
+        cflags = "-O2 -ggdb3 -DNDEBUG";
         extraCmakeFlags = [
           "-DCMAKE_SYSTEM_NAME=Generic"
           "-DCMAKE_SYSTEM_PROCESSOR=i386"
@@ -345,13 +346,13 @@ rec {
         buildenv = pkgs.multiStdenv;
         platform = "linux";
         buildtype = "Debug";
-        cflags = "-O0 -ggdb";
+        cflags = "-O0 -ggdb3";
       };
       libiwasm-linux-release = mkLibiwasm {
         buildenv = pkgs.multiStdenv;
         platform = "linux";
-        buildtype = "Release";
-        cflags = "-O2 -ggdb -DNDEBUG";
+        buildtype = "MinSizeRel";
+        cflags = "-O2 -ggdb3 -DNDEBUG";
       };
 
       # ===========================================================================================
diff --git a/wasm.just b/wasm.just
index f1d9b70..bdbcaf6 100644
--- a/wasm.just
+++ b/wasm.just
@@ -22,7 +22,7 @@ CROSS_CFLAGS_NOWASM := "\
 -fdata-sections \
 -ffreestanding \
 -fomit-frame-pointer \
--ggdb \
+-ggdb3 \
 "
 CROSS_LDFLAGS_NOWASM := "\
 -Wl,--build-id=none \
@@ -38,7 +38,7 @@ LINUX_CFLAGS_NOWASM := "\
 -m32 \
 -ffunction-sections \
 -fdata-sections \
--ggdb \
+-ggdb3 \
 "
 LINUX_LDFLAGS_NOWASM := "\
 -Wl,--build-id=none \
@@ -103,8 +103,8 @@ build-c-module module target="fail":
 # =================================================================================================================== #
 # FAIL*
 
-CROSS_CFLAGS := f"-I./targets/wasm-host {{CROSS_CFLAGS_NOWASM}} -O2"
-CROSS_LDFLAGS := f"-L{{LIBIWASM_RELEASE}} -liwasm {{CROSS_LDFLAGS_NOWASM}}"
+CROSS_CFLAGS := f"-I./targets/wasm-host {{CROSS_CFLAGS_NOWASM}} -O0"
+CROSS_LDFLAGS := f"-L{{LIBIWASM_DEBUG}} -liwasm {{CROSS_LDFLAGS_NOWASM}}"
 CROSS_INCLUDES := f"\
 -I{{WAMR_ROOT}}/core/iwasm/include \
 -I{{WAMR_ROOT}}/core/shared/utils \
@@ -113,7 +113,7 @@ CROSS_INCLUDES := f"\
 
 # LINUX-POSIX
 
-LINUX_CFLAGS := f"-I./targets/wasm-host {{ LINUX_CFLAGS_NOWASM }}"
+LINUX_CFLAGS := f"-I./targets/wasm-host {{ LINUX_CFLAGS_NOWASM }} -O0"
 LINUX_LDFLAGS := f"-Wl,-rpath,{{LIBIWASM_LINUX_DEBUG}} -L{{LIBIWASM_LINUX_DEBUG}} -liwasm {{LINUX_LDFLAGS_NOWASM}}"
 LINUX_INCLUDES := f"\
 -I{{WAMR_ROOT}}/core/iwasm/include \
@@ -130,7 +130,7 @@ LINUX_BAREMETAL_CFLAGS := "\
 -ffunction-sections \
 -fdata-sections \
 -ffreestanding \
--ggdb \
+-ggdb3 \
 "
 LINUX_BAREMETAL_LDFLAGS := f"\
 -Wl,--build-id=none \