python
diff --git a/‎Misc/NEWS.d/next/Build/2024-12-21-09-56-37.gh-issue-100384.Ib-XrN.rst‎
Lines changed: 2 additions & 0 deletions b/‎Misc/NEWS.d/next/Build/2024-12-21-09-56-37.gh-issue-100384.Ib-XrN.rst‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎configure‎
Lines changed: 41 additions & 0 deletions b/‎configure‎
Lines changed: 41 additions & 0 deletions
diff --git a/‎configure.ac‎
Lines changed: 7 additions & 0 deletions b/‎configure.ac‎
Lines changed: 7 additions & 0 deletions
@@ -0,0 +1,2 @@
+Error on `unguarded-availability-new` in Darwin builds, preventing invalid
+use of symbols that are not available in older versions of the OS.
@@ -2603,6 +2603,13 @@ AS_VAR_IF([ac_cv_gcc_compat], [yes], [
         esac
         AC_MSG_RESULT([$CC])
 
+        # Error on unguarded use of new symbols, which will fail at runtime for
+        # users on older versions of macOS
+        AX_CHECK_COMPILE_FLAG([-Wunguarded-availability-new],
+            [AS_VAR_APPEND([CFLAGS_NODIST], [" -Werror=unguarded-availability-new"])],
+            [],
+            [-Werror])
+
         LIPO_INTEL64_FLAGS=""
         if test "${enable_universalsdk}"
         then
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Error on `unguarded-availability-new` in Darwin builds, preventing invalid
	`2`	`+use of symbols that are not available in older versions of the OS.`