fix: use arch-specific libstdc++ path for ARM64 release

Author: sanonone

Makefile

@@ -9,7 +9,11 @@ PROTOC := $(shell which protoc 2>/dev/null || echo /tmp/protoc/bin/protoc)
 
 # Path to GCC's libstdc++ for release linking with Zig.
 # Zig's lld doesn't search the system GCC library path by default.
+# Each target needs its own architecture-specific libstdc++:
+# - AMD64 uses the host g++ path (native)
+# - ARM64 uses the cross-compiler g++ path (aarch64-linux-gnu-g++)
 GCC_LIBSTDCPP_DIR := $(shell dirname $$(g++ --print-file-name=libstdc++.a 2>/dev/null || echo /usr/lib))
+GCC_AARCH64_LIBSTDCPP_DIR := $(shell dirname $$(aarch64-linux-gnu-g++ --print-file-name=libstdc++.a 2>/dev/null || echo /usr/lib))
 
 # --- Main Targets ---
 .PHONY: all test test-rust bench bench-rust clean release ensure-protoc fmt
@@ -94,7 +98,7 @@ release: clean
 	@make release-build TARGET=aarch64-unknown-linux-gnu ZIG_TARGET=aarch64-linux-gnu \
 	GOOS=linux GOARCH=arm64 \
 	BUILD_CC="zig cc -target aarch64-linux-gnu" BUILD_CXX="zig c++ -target aarch64-linux-gnu" \
-	CGO_LDFLAGS="-L$(CURDIR)/native/compute/target/aarch64-unknown-linux-gnu/release -lkektordb_compute -ldl -lm -lgcc_s -lc -lpthread -L$(GCC_LIBSTDCPP_DIR) -lstdc++"
+	CGO_LDFLAGS="-L$(CURDIR)/native/compute/target/aarch64-unknown-linux-gnu/release -lkektordb_compute -ldl -lm -lgcc_s -lc -lpthread -L$(GCC_AARCH64_LIBSTDCPP_DIR) -lstdc++"
 
 	# Windows AMD64 (cross-compile with Zig)
 	@make release-build TARGET=x86_64-pc-windows-gnu ZIG_TARGET=x86_64-windows-gnu \