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authorqinxialei <xialeiqin@gmail.com>2021-04-22 11:20:18 +0800
committerqinxialei <xialeiqin@gmail.com>2021-04-22 11:20:18 +0800
commit81ce37eb93e8ce442ecb1855a4e7166628128ac7 (patch)
tree2af6329f74f88ce090d08c61db5fb4bed8656584 /src/gav1/symbol_visibility.h
parent4dab0c756a3cdd65b43470a4cca835422b32ca6e (diff)
parent2381d803c76105f44717d75f089ec37f51e5cfe4 (diff)
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Update upstream source from tag 'upstream/0.16.3'
Update to upstream version '0.16.3' with Debian dir a433e04a69210eb8fcdd6089240e161eb33f0590
Diffstat (limited to 'src/gav1/symbol_visibility.h')
-rw-r--r--src/gav1/symbol_visibility.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/gav1/symbol_visibility.h b/src/gav1/symbol_visibility.h
index ad7498c..116a514 100644
--- a/src/gav1/symbol_visibility.h
+++ b/src/gav1/symbol_visibility.h
@@ -58,6 +58,11 @@
//
// Much of the above information and more can be found at
// https://gcc.gnu.org/wiki/Visibility
+//
+// NOTE: A third-party build system for libgav1 can add -DLIBGAV1_PUBLIC= to the
+// compiler command line to override the definition of LIBGAV1_PUBLIC in this
+// header. This can be used to create a libgav1 static library that will not
+// export any symbols when it is linked into a shared library.
#if !defined(LIBGAV1_PUBLIC)
#if defined(_WIN32)
@@ -76,7 +81,7 @@
#else
#define LIBGAV1_PUBLIC
#endif // defined(LIBGAV1_BUILDING_DLL) && LIBGAV1_BUILDING_DLL
-#else
+#else // !defined(_WIN32)
#if defined(__GNUC__) && __GNUC__ >= 4
#define LIBGAV1_PUBLIC __attribute__((visibility("default")))
#else