Explicitly state visibility

This cuts the exportet symbols from 12k to 2k and the library size from
16Mb to 14Mb, which isn't great but still an improvement.

About 30% of the symbols are coming from the Store:: interface.

nm -C -D /work/install/lib64/libsinkcommon.so.0.1

1 files changed, 2 insertions, 1 deletions

diff --git a/common/index.h b/common/index.h
index 20213b2..672f3c2 100644
--- a/common/index.h
+++ b/common/index.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <sinkcommon_export.h>
 #include <string>
 #include <functional>
 #include <QString>
@@ -8,7 +9,7 @@
 /**
  * An index for value pairs.
  */
-class Index
+class SINKCOMMON_EXPORT Index
 {
 public:
     enum ErrorCodes {