From: Yury Gribov <tetra2005@gmail.com>
Date: Wed, 25 Apr 2018 05:03:36 +0000 (+0100)
Subject: Hide private symbols.
X-Git-Tag: R_2_2_7~24^2~1
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=30f8c30b6a9cf3711dfef1a9bb7d5b045a206d89;p=libexpat

Hide private symbols.
---

diff --git a/expat/CMakeLists.txt b/expat/CMakeLists.txt
index 673184fa..a052f189 100644
--- a/expat/CMakeLists.txt
+++ b/expat/CMakeLists.txt
@@ -101,6 +101,10 @@ set(EXTRA_COMPILE_FLAGS)
 if(FLAG_NO_STRICT_ALIASING)
     set(EXTRA_COMPILE_FLAGS "${EXTRA_COMPILE_FLAGS} -fno-strict-aliasing")
 endif()
+if(FLAG_VISIBILITY)
+  add_definitions(-DXML_ENABLE_VISIBILITY=1)
+  set(EXTRA_COMPILE_FLAGS "${EXTRA_COMPILE_FLAGS} -fvisibility=hidden")
+endif(FLAG_VISIBILITY)
 if (WARNINGS_AS_ERRORS)
     if(MSVC)
         add_definitions(/WX)
diff --git a/expat/ConfigureChecks.cmake b/expat/ConfigureChecks.cmake
index dbb49210..818d2492 100644
--- a/expat/ConfigureChecks.cmake
+++ b/expat/ConfigureChecks.cmake
@@ -68,3 +68,4 @@ configure_file(expat_config.h.cmake "${CMAKE_CURRENT_BINARY_DIR}/expat_config.h"
 add_definitions(-DHAVE_EXPAT_CONFIG_H)
 
 check_c_compiler_flag("-fno-strict-aliasing" FLAG_NO_STRICT_ALIASING)
+check_c_compiler_flag("-fvisibility=hidden" FLAG_VISIBILITY)
diff --git a/expat/configure.ac b/expat/configure.ac
index a68d9a4e..12f66422 100644
--- a/expat/configure.ac
+++ b/expat/configure.ac
@@ -88,6 +88,13 @@ if test "$GCC" = yes ; then
     LDFLAGS="${LDFLAGS} -fno-strict-aliasing"
 fi
 
+AC_MSG_CHECKING(whether compiler supports visibility)
+OLDCFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -fvisibility=hidden -Wall -Werror"
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[void __attribute__((visibility("default"))) foo(void); void foo(void) {}]])],
+                  AC_MSG_RESULT(yes); CFLAGS="$OLDCFLAGS -fvisibility=hidden -DXML_ENABLE_VISIBILITY=1",
+                  AC_MSG_RESULT(no); CFLAGS="$OLDCFLAGS")
+
 dnl Checks for header files.
 AC_HEADER_STDC
 
diff --git a/expat/lib/expat_external.h b/expat/lib/expat_external.h
index 629483a9..875225d7 100644
--- a/expat/lib/expat_external.h
+++ b/expat/lib/expat_external.h
@@ -93,7 +93,11 @@
 # endif
 #endif  /* not defined XML_STATIC */
 
-#if !defined(XMLIMPORT) && defined(__GNUC__) && (__GNUC__ >= 4)
+#ifndef XML_ENABLE_VISIBILITY
+# define XML_ENABLE_VISIBILITY 0
+#endif
+
+#if !defined(XMLIMPORT) && XML_ENABLE_VISIBILITY
 # define XMLIMPORT __attribute__ ((visibility ("default")))
 #endif
 
diff --git a/expat/lib/internal.h b/expat/lib/internal.h
index e33fdcb0..dc4ef0c7 100644
--- a/expat/lib/internal.h
+++ b/expat/lib/internal.h
@@ -115,6 +115,11 @@ extern "C" {
 #endif
 
 
+#ifdef XML_ENABLE_VISIBILITY
+#if XML_ENABLE_VISIBILITY
+__attribute__ ((visibility ("default")))
+#endif
+#endif
 void
 _INTERNAL_trim_to_complete_utf8_characters(const char * from, const char ** fromLimRef);