From 5235554eb4071c798fef9b29f46e9c96970055ea Mon Sep 17 00:00:00 2001
From: Yuri Gribov <tetra2005@gmail.com>
Date: Sun, 3 Jul 2022 10:54:39 +0300
Subject: Hide internal symbols on platforms that support visibility
 annotations (see discussion in gh-1017).

---
 configure.ac | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index b30430d2..cc51badc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1247,6 +1247,18 @@ case "$host_os" in
 	;;
 esac
 
+dnl Visibility annotations...
+saved_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
+AC_MSG_CHECKING(whether compiler supports visibility annotations)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([
+                 int foo( void ) __attribute__((visibility("default")));
+               ])],
+               [CFLAGS="$saved_CFLAGS -fvisibility=hidden -D__LIBARCHIVE_ENABLE_VISIBILITY";
+                AC_MSG_RESULT(yes)],
+               [CFLAGS="$saved_CFLAGS"
+                AC_MSG_RESULT(no)])
+
 # Ensure test directories are present if building out-of-tree
 AC_CONFIG_COMMANDS([mkdirs],
 		   [mkdir -p libarchive/test tar/test cat/test cpio/test])
-- 
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