From ef9efcf0bf699f772fcc2e70f96f7db840e03fc0 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 14 Feb 2023 18:37:33 +0900
Subject: [PATCH] Check if objcopy works to localize symbol

LLVM objcopy does not support localizing symbols option, e.g,
`--localize-symbol` and `--keep-global-symbol`, for MachO.
---
 configure.ac | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/configure.ac b/configure.ac
index ff903a9260..fa5f815042 100644
--- a/configure.ac
+++ b/configure.ac
@@ -506,6 +506,16 @@ AS_CASE(["$target_os"],
     ],
 [hiuxmpp*], [AC_DEFINE(__HIUX_MPP__)])    # by TOYODA Eizi <toyoda@npd.kishou.go.jp>
 
+
+AS_IF([test "$OBJCOPY" != :], [
+    AC_MSG_CHECKING([if $OBJCOPY works to localize symbols])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[void conftest_objcopy(void) {}]])],
+    [
+        $OBJCOPY -w -L '*conftest_*' conftest.$OBJEXT 2>/dev/null || OBJCOPY=:
+    ])
+    AS_IF([test "$OBJCOPY" = :], [AC_MSG_RESULT(no)], [AC_MSG_RESULT(yes)])
+])
+
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL