Compile postgres

Makefile

@@ -43,7 +43,7 @@ TESTABLE_APPS  := bash coreutils curl git grep lmbench sed tinycc
 APP            ?= $(TESTABLE_APPS)
 
 # -------- Phonies -------------------------------------------------------------
-.PHONY: all preflight dirs print-config check-build libtirpc gnulib zlib openssl libcxx merge-base-sysroot merge-sysroot lmbench bash nginx coreutils cpython git curl grep sed gcc binutils postgres clean clean-all rebuild-libs rebuild-sysroot test install-bash install-nginx install-git install-curl install-grep install-sed install-lmbench install-coreutils install-gcc install-binutils install
+.PHONY: all preflight dirs print-config check-build libtirpc gnulib zlib openssl libcxx merge-base-sysroot merge-sysroot lmbench bash nginx coreutils cpython git curl grep sed gcc binutils postgres clean clean-all rebuild-libs rebuild-sysroot test install-bash install-nginx install-git install-curl install-grep install-sed install-lmbench install-coreutils install-gcc install-binutils install-postgres install
 
 all: preflight libtirpc gnulib merge-sysroot lmbench bash
 
@@ -346,6 +346,14 @@ cpython: merge-sysroot
 postgres: merge-sysroot
 	mkdir -p '$(APPS_BIN_DIR)/postgres/wasm32-wasi'
 
+# ---------------- postgres (WASM build) ---------------------------------------
+# Uses postgres/compile_postgres.sh to build the PostgreSQL backend as a
+# wasm32-wasi binary using the merged sysroot and toolchain detected by
+# preflight, and stages artifacts under build/bin/postgres/wasm32-wasi/.
+postgres: merge-sysroot
+	. '$(TOOL_ENV)'
+	'$(APPS_ROOT)/postgres/compile_postgres.sh'
+
 install-bash:
 	'$(APPS_ROOT)/scripts/post_install.sh' '$(LINDFS_ROOT)' '$(APPS_BUILD)' bash
 
@@ -370,10 +378,13 @@ install-lmbench:
 install-coreutils:
 	'$(APPS_ROOT)/scripts/post_install.sh' '$(LINDFS_ROOT)' '$(APPS_BUILD)' coreutils
 
+install-postgres:
+	'$(APPS_ROOT)/scripts/post_install.sh' '$(LINDFS_ROOT)' '$(APPS_BIN_DIR)' postgres
+
 install-gcc:
 	'$(APPS_ROOT)/scripts/post_install.sh' '$(LINDFS_ROOT)' '$(APPS_BUILD)' gcc
 
 install-binutils:
 	'$(APPS_ROOT)/scripts/post_install.sh' '$(LINDFS_ROOT)' '$(APPS_BUILD)' binutils
 
-install: install-bash install-nginx install-git install-curl install-grep install-sed install-lmbench install-coreutils install-gcc install-binutils
+install: install-bash install-nginx install-git install-curl install-grep install-sed install-lmbench install-coreutils install-gcc install-binutils install-postgres