Add support for shared library build

Author: makkarpov

.gitignore

@@ -7,4 +7,8 @@ bazel-spirv-reflect
 bazel-SPIRV-Reflect
 bazel-testlogs
 /.vs
-/.vscode
+/.vscode
+
+# CLion-specific:
+/.idea
+/cmake-build*

CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.5)
 
 project(spirv-reflect)
 
+OPTION(BUILD_SHARED_LIBS            "Build shared library" OFF)
 OPTION(SPIRV_REFLECT_EXECUTABLE     "Build spirv-reflect executable" ON)
 
 OPTION(SPIRV_REFLECT_STATIC_LIB     "Build a SPIRV-Reflect static library" OFF)
@@ -13,6 +14,8 @@ set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 set(CMAKE_CXX_STANDARD 14)
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/bin")
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}")
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}")
 
 if (SPIRV_REFLECT_ENABLE_ASAN)
     add_compile_options(-fsanitize=address -fno-omit-frame-pointer)
@@ -118,3 +121,18 @@ if(SPIRV_REFLECT_STATIC_LIB)
             ARCHIVE DESTINATION lib)
 endif()
 
+if(BUILD_SHARED_LIBS)
+    add_library(spirv-reflect SHARED ${CMAKE_CURRENT_SOURCE_DIR}/spirv_reflect.h
+            ${CMAKE_CURRENT_SOURCE_DIR}/spirv_reflect.c)
+
+    target_include_directories(spirv-reflect
+            PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+    target_compile_definitions(spirv-reflect PUBLIC SPIRV_REFLECT_SHARED)
+    target_compile_options(spirv-reflect PRIVATE
+            $<$<CXX_COMPILER_ID:GNU>:-fvisibility=hidden>)
+
+    install(TARGETS spirv-reflect
+            LIBRARY DESTINATION lib
+            ARCHIVE DESTINATION lib)
+endif ()

spirv_reflect.c

@@ -14,6 +14,7 @@
  limitations under the License.
 */
 
+#define SPIRV_REFLECT_IMPLEMENTATION  // turn dllimports into dllexports
 #include "spirv_reflect.h"
 
 #include <assert.h>