Check if gcc complains about __attribute__ (visibility(..))

If so, define attribute_hidden to be empty. Also, use attribute_hidden
in all places where we hide symbols.

Change-Id: I37353459710dbbd1c6c6c46110514fc18515c814
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 36c3cc74..01f88f3b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2017-04-27  Ulf Hermann  <ulf.hermann@qt.io>
 
+	* configure.ac: Check if the compiler supports
+	__attribute__((visibility(...))).
+
+2017-04-27  Ulf Hermann  <ulf.hermann@qt.io>
+
 	* configure.ac: Check if -fPIC, -fPIE, -Wl,-z,defs,
 	and -Wl,-z,relro are supported by the compiler.