File libzip-visibility.diff of Package libzip.1248

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File libzip-visibility.diff of Package libzip.1248

diff -r 165a2f158cf6 configure.ac
--- a/configure.ac	Mon Apr 29 16:40:17 2013 +0200
+++ b/configure.ac	Sun May 05 00:15:28 2013 +0200
@@ -99,6 +99,8 @@
 #endif
 ])
 
+gl_VISIBILITY
+
 AC_CONFIG_FILES([Makefile
 		 libzip.pc
 		 libzip-uninstalled.pc
diff -r 165a2f158cf6 lib/Makefile.am
--- a/lib/Makefile.am	Mon Apr 29 16:40:17 2013 +0200
+++ b/lib/Makefile.am	Sun May 05 00:15:28 2013 +0200
@@ -1,3 +1,4 @@
+AM_CFLAGS=	@CFLAG_VISIBILITY@
 libincludedir = ${libdir}/@PACKAGE@/include
 
 lib_LTLIBRARIES = libzip.la
diff -r 165a2f158cf6 m4/visibility.m4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m4/visibility.m4	Sun May 05 00:15:28 2013 +0200
@@ -0,0 +1,52 @@
+# visibility.m4 serial 1 (gettext-0.15)
+dnl Copyright (C) 2005 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Bruno Haible.
+
+dnl Tests whether the compiler supports the command-line option
+dnl -fvisibility=hidden and the function and variable attributes
+dnl __attribute__((__visibility__("hidden"))) and
+dnl __attribute__((__visibility__("default"))).
+dnl Does *not* test for __visibility__("protected") - which has tricky
+dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on
+dnl MacOS X.
+dnl Does *not* test for __visibility__("internal") - which has processor
+dnl dependent semantics.
+dnl Does *not* test for #pragma GCC visibility push(hidden) - which is
+dnl "really only recommended for legacy code".
+dnl Set the variable CFLAG_VISIBILITY.
+dnl Defines and sets the variable HAVE_VISIBILITY.
+
+AC_DEFUN([gl_VISIBILITY],
+[
+  AC_REQUIRE([AC_PROG_CC])
+  CFLAG_VISIBILITY=
+  HAVE_VISIBILITY=0
+  if test -n "$GCC"; then
+    AC_MSG_CHECKING([for simple visibility declarations])
+    AC_CACHE_VAL(gl_cv_cc_visibility, [
+      gl_save_CFLAGS="$CFLAGS"
+      CFLAGS="$CFLAGS -fvisibility=hidden"
+      AC_TRY_COMPILE(
+        [extern __attribute__((__visibility__("hidden"))) int hiddenvar;
+         extern __attribute__((__visibility__("default"))) int exportedvar;
+         extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void);
+         extern __attribute__((__visibility__("default"))) int exportedfunc (void);],
+        [],
+        gl_cv_cc_visibility=yes,
+        gl_cv_cc_visibility=no)
+      CFLAGS="$gl_save_CFLAGS"])
+    AC_MSG_RESULT([$gl_cv_cc_visibility])
+    if test $gl_cv_cc_visibility = yes; then
+      CFLAG_VISIBILITY="-fvisibility=hidden"
+      HAVE_VISIBILITY=1
+    fi
+  fi
+  AC_SUBST([CFLAG_VISIBILITY])
+  AC_SUBST([HAVE_VISIBILITY])
+  AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
+    [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
+])

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File libzip-visibility.diff of Package libzip.1248

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