With a script

Makefile

@@ -103,12 +103,7 @@ clean-all: clean clean-regression clean-duckdb
 
 $(CPP_ONLY_FILE):
 	@rm -f $(CPP_ONLY_FILE)
-	@echo "// Auto-generated file, run 'make update_cpp_guard' to update" > $(CPP_ONLY_FILE)
-	@echo "#if \\" >> $(CPP_ONLY_FILE)
-	for m in $$(grep -R '_H$$' "$(INCLUDEDIR)" | grep define | cut -d \: -f 2 | cut -d \  -f 2 | sort); do echo "defined($$m) || \\"; done >> $(CPP_ONLY_FILE)
-	@echo "false" >> $(CPP_ONLY_FILE)
-	@echo "static_assert(false, \"No Postgres header should be included in this file.\");" >> $(CPP_ONLY_FILE)
-	@echo "#endif" >> $(CPP_ONLY_FILE)
+	./scripts/generate-pg-include-guard.sh $(CPP_ONLY_FILE) $(INCLUDEDIR)
 
 lintcheck:
 	clang-tidy $(SRCS) -- -I$(INCLUDEDIR) -I$(INCLUDEDIR_SERVER) -Iinclude $(CPPFLAGS) -std=c++17

scripts/generate-pg-include-guard.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -euo pipefail
+
+CPP_ONLY_FILE=$1
+PG_INCLUDE_DIR=$2
+
+OUTPUT_DIR=$(dirname "${CPP_ONLY_FILE}")
+
+mkdir -p "${OUTPUT_DIR}"
+
+echo "Will generate: $(pwd)/${CPP_ONLY_FILE}"
+
+echo "// Auto-generated file, run 'make update_cpp_guard' to update" > "${CPP_ONLY_FILE}"
+echo "#if \\" >> "${CPP_ONLY_FILE}"
+
+
+grep -R '_H$' "${PG_INCLUDE_DIR}" | grep define | cut -d: -f 2 | cut -d \  -f 2 | sort | while read -r m;
+do
+    echo "defined($m) || \\";
+done >> "${CPP_ONLY_FILE}"
+
+echo "false" >> "${CPP_ONLY_FILE}"
+echo "static_assert(false, \"No Postgres header should be included in this file.\");" >> "${CPP_ONLY_FILE}"
+echo "#endif" >> "${CPP_ONLY_FILE}"
+
+NB_DEFINED=$(grep defined "${CPP_ONLY_FILE}" | wc -l)
+echo "Used $NB_DEFINED macros in ${CPP_ONLY_FILE}"