Make libdawn a shared library, add a DAWN_EXPORT macro

CMakeLists.txt

@@ -216,9 +216,11 @@ Generate(
         ${GENERATOR_COMMON_ARGS}
         -T libdawn
 )
+target_compile_definitions(libdawn_autogen PRIVATE DAWN_IMPLEMENTATION)
 
-add_library(libdawn STATIC
+add_library(libdawn SHARED
     $<TARGET_OBJECTS:libdawn_autogen>
+    ${INCLUDE_DIR}/dawn/dawn_export.h
     ${INCLUDE_DIR}/dawn/dawn_wsi.h
     ${INCLUDE_DIR}/dawn/EnumClassBitmasks.h
 )

generator/templates/api.h

@@ -15,6 +15,8 @@
 #ifndef DAWN_DAWN_H_
 #define DAWN_DAWN_H_
 
+#include "dawn/dawn_export.h"
+
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
@@ -81,12 +83,12 @@ typedef struct dawnProcTable_s dawnProcTable;
 // Stuff below is for convenience and will forward calls to a static dawnProcTable.
 
 // Set which dawnProcTable will be used
-void dawnSetProcs(const dawnProcTable* procs);
+DAWN_EXPORT void dawnSetProcs(const dawnProcTable* procs);
 
 {% for type in by_category["object"] %}
     // Methods of {{type.name.CamelCase()}}
     {% for method in native_methods(type) %}
-        {{as_cType(method.return_type.name)}} {{as_cMethod(type.name, method.name)}}(
+        DAWN_EXPORT {{as_cType(method.return_type.name)}} {{as_cMethod(type.name, method.name)}}(
             {{-as_cType(type.name)}} {{as_varName(type.name)}}
             {%- for arg in method.arguments -%}
                 , {{as_annotated_cType(arg)}}

generator/templates/apicpp.h

@@ -15,8 +15,8 @@
 #ifndef DAWN_DAWNCPP_H_
 #define DAWN_DAWNCPP_H_
 
-#include "dawn.h"
-
+#include "dawn/dawn.h"
+#include "dawn/dawn_export.h"
 #include "dawn/EnumClassBitmasks.h"
 
 namespace dawn {
@@ -141,7 +141,7 @@ namespace dawn {
     {% for type in by_category["object"] %}
         {% set CppType = as_cppType(type.name) %}
         {% set CType = as_cType(type.name) %}
-        class {{CppType}} : public ObjectBase<{{CppType}}, {{CType}}> {
+        class DAWN_EXPORT {{CppType}} : public ObjectBase<{{CppType}}, {{CType}}> {
             public:
                 using ObjectBase::ObjectBase;
                 using ObjectBase::operator=;

src/include/dawn/dawn_export.h

@@ -0,0 +1,32 @@
+// Copyright 2018 The Dawn Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef DAWN_EXPORT_H_
+#define DAWN_EXPORT_H_
+
+#if defined(WIN32)
+#    if defined(DAWN_IMPLEMENTATION)
+#        define DAWN_EXPORT __declspec(dllexport)
+#    else
+#        define DAWN_EXPORT __declspec(dllimport)
+#    endif
+#else
+#    if defined(DAWN_IMPLEMENTATION)
+#        define DAWN_EXPORT __attribute__((visibility("default")))
+#    else
+#        define DAWN_EXPORT
+#    endif
+#endif
+
+#endif  // DAWN_EXPORT_H_