Add inlinesvisibility API + implement for gcc

src/_premake_init.lua

@@ -1378,6 +1378,16 @@
 		}
 	}
 
+	api.register {
+		name = "inlinesvisibility",
+		scope = "config",
+		kind = "string",
+		allowed = {
+			"Default",
+			"Hidden"
+		}
+	}
+
 -----------------------------------------------------------------------------
 --
 -- Field name aliases for backward compatibility

src/tools/gcc.lua

@@ -177,6 +177,9 @@
 			Hidden = "-fvisibility=hidden",
 			Internal = "-fvisibility=internal",
 			Protected = "-fvisibility=protected",
+		},
+		inlinesvisibility = {
+			Hidden = "-fvisibility-inlines-hidden"
 		}
 	}
 

tests/tools/test_gcc.lua

@@ -867,3 +867,21 @@
 		test.excludes({ "-fvisibility=protected" }, gcc.getcflags(cfg))
 		test.contains({ "-fvisibility=protected" }, gcc.getcxxflags(cfg))
 	end
+
+--
+-- Test inlines visibility flags.
+--
+
+	function suite.cxxflags_onInlinesVisibilityDefault()
+		inlinesvisibility "Default"
+		prepare()
+		test.excludes({ "-fvisibility-inlines-hidden" }, gcc.getcflags(cfg))
+		test.excludes({ "-fvisibility-inlines-hidden" }, gcc.getcxxflags(cfg))
+	end
+
+	function suite.cxxflags_onInlinesVisibilityHidden()
+		inlinesvisibility "Hidden"
+		prepare()
+		test.excludes({ "-fvisibility-inlines-hidden" }, gcc.getcflags(cfg))
+		test.contains({ "-fvisibility-inlines-hidden" }, gcc.getcxxflags(cfg))
+	end