Move definition of GLSLANG_EXPORT to visibility.h

The GLSLANG_EXPORT macro is already used (and defined) in two separate
places and will be used in a few more in the near future. To reduce
duplication it is now in its own header.

glslang/CMakeLists.txt

@@ -261,6 +261,7 @@ if(GLSLANG_ENABLE_INSTALL)
         Include/glslang_c_shader_types.h
         Include/ResourceLimits.h
         MachineIndependent/iomapper.h
+        Include/visibility.h
         MachineIndependent/Versions.h)
 
     foreach(file ${PUBLIC_HEADERS})

glslang/Include/glslang_c_interface.h

@@ -37,6 +37,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <stdlib.h>
 
 #include "glslang_c_shader_types.h"
+#include "visibility.h"
 
 typedef struct glslang_shader_s glslang_shader_t;
 typedef struct glslang_program_s glslang_program_t;
@@ -244,22 +245,6 @@ typedef struct glslang_spv_options_s {
 extern "C" {
 #endif
 
-#ifdef GLSLANG_IS_SHARED_LIBRARY
-    #ifdef _WIN32
-        #ifdef GLSLANG_EXPORTING
-            #define GLSLANG_EXPORT __declspec(dllexport)
-        #else
-            #define GLSLANG_EXPORT __declspec(dllimport)
-        #endif
-    #elif __GNUC__ >= 4
-        #define GLSLANG_EXPORT __attribute__((visibility("default")))
-    #endif
-#endif // GLSLANG_IS_SHARED_LIBRARY
-
-#ifndef GLSLANG_EXPORT
-#define GLSLANG_EXPORT
-#endif
-
 GLSLANG_EXPORT void glslang_get_version(glslang_version_t* version);
 
 GLSLANG_EXPORT int glslang_initialize_process(void);

glslang/Include/visibility.h

@@ -0,0 +1,51 @@
+//
+// Copyright (C) 2023 LunarG, Inc.
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+//    Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//
+//    Redistributions in binary form must reproduce the above
+//    copyright notice, this list of conditions and the following
+//    disclaimer in the documentation and/or other materials provided
+//    with the distribution.
+//
+//    Neither the name of 3Dlabs Inc. Ltd. nor the names of its
+//    contributors may be used to endorse or promote products derived
+//    from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+#ifdef GLSLANG_IS_SHARED_LIBRARY
+    #ifdef _WIN32
+        #ifdef GLSLANG_EXPORTING
+            #define GLSLANG_EXPORT __declspec(dllexport)
+        #else
+            #define GLSLANG_EXPORT __declspec(dllimport)
+        #endif
+    #elif __GNUC__ >= 4
+        #define GLSLANG_EXPORT __attribute__((visibility("default")))
+    #endif
+#endif // GLSLANG_IS_SHARED_LIBRARY
+
+#ifndef GLSLANG_EXPORT
+#define GLSLANG_EXPORT
+#endif
+
+

glslang/Public/ShaderLang.h

@@ -38,6 +38,7 @@
 #define _COMPILER_INTERFACE_INCLUDED_
 
 #include "../Include/ResourceLimits.h"
+#include "../Include/visibility.h"
 #include "../MachineIndependent/Versions.h"
 
 #include <cstring>
@@ -49,22 +50,6 @@
     #define C_DECL
 #endif
 
-#ifdef GLSLANG_IS_SHARED_LIBRARY
-    #ifdef _WIN32
-        #ifdef GLSLANG_EXPORTING
-            #define GLSLANG_EXPORT __declspec(dllexport)
-        #else
-            #define GLSLANG_EXPORT __declspec(dllimport)
-        #endif
-    #elif __GNUC__ >= 4
-        #define GLSLANG_EXPORT __attribute__((visibility("default")))
-    #endif
-#endif // GLSLANG_IS_SHARED_LIBRARY
-
-#ifndef GLSLANG_EXPORT
-#define GLSLANG_EXPORT
-#endif
-
 //
 // This is the platform independent interface between an OGL driver
 // and the shading language compiler/linker.