From cca4664e840c019c1656a02219ae6e0ee3b63e33 Mon Sep 17 00:00:00 2001
From: mutouyun <orz@orzz.org>
Date: Sat, 10 Jul 2021 13:50:46 +0800
Subject: [PATCH] option(LIBIPC_BUILD_SHARED_LIBS 'Build shared libraries
 (DLLs).' OFF)

---
 CMakeLists.txt          | 12 ++++++------
 include/libipc/export.h |  6 ++++--
 src/CMakeLists.txt      | 18 ++++++++++++++----
 3 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 57f62e7..56a6fac 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@ option(LIBIPC_BUILD_DEMOS "Build all of libipc's own demos." OFF)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DNDEBUG")
 if(NOT MSVC)
-    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2")
+  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2")
 endif()
 
 include_directories(${CMAKE_SOURCE_DIR}/include)
@@ -19,14 +19,14 @@ set(LIBIPC_PROJECT_DIR     ${PROJECT_SOURCE_DIR})
 add_subdirectory(src)
 
 if (LIBIPC_BUILD_TESTS)
-    set(GOOGLETEST_VERSION 1.10.0)
-    add_subdirectory(3rdparty/gtest)
-    add_subdirectory(test)
+  set(GOOGLETEST_VERSION 1.10.0)
+  add_subdirectory(3rdparty/gtest)
+  add_subdirectory(test)
 endif()
 
 if (LIBIPC_BUILD_DEMOS)
-    add_subdirectory(demo/chat)
-    add_subdirectory(demo/msg_que)
+  add_subdirectory(demo/chat)
+  add_subdirectory(demo/msg_que)
 endif()
 
 install(
diff --git a/include/libipc/export.h b/include/libipc/export.h
index c555574..6024f2f 100755
--- a/include/libipc/export.h
+++ b/include/libipc/export.h
@@ -44,9 +44,11 @@
 */
 
 #ifndef IPC_EXPORT
-#if defined(__IPC_LIBRARY__)
+#if defined(LIBIPC_LIBRARY_SHARED_BUILDING__)
 #  define IPC_EXPORT IPC_DECL_EXPORT
-#else
+#elif defined(LIBIPC_LIBRARY_SHARED_USING__)
 #  define IPC_EXPORT IPC_DECL_IMPORT
+#else
+#  define IPC_EXPORT
 #endif
 #endif /*IPC_EXPORT*/
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 08faf05..143f9de 100755
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,6 +1,6 @@
 project(ipc)
 
-add_compile_options(-D__IPC_LIBRARY__)
+option(LIBIPC_BUILD_SHARED_LIBS "Build shared libraries (DLLs)." OFF)
 
 if(NOT MSVC)
   add_compile_options(-fPIC)
@@ -26,11 +26,21 @@ file(GLOB HEAD_FILES
   ${LIBIPC_PROJECT_DIR}/src/libipc/platform/*.h
   ${LIBIPC_PROJECT_DIR}/src/libipc/utility/*.h)
 
-add_library(${PROJECT_NAME} SHARED ${SRC_FILES} ${HEAD_FILES})
+if (LIBIPC_BUILD_SHARED_LIBS)
+  add_library(${PROJECT_NAME} SHARED ${SRC_FILES} ${HEAD_FILES})
+  target_compile_definitions(${PROJECT_NAME}
+    INTERFACE
+      LIBIPC_LIBRARY_SHARED_USING__
+    PRIVATE
+      LIBIPC_LIBRARY_SHARED_BUILDING__)
+else()
+  add_library(${PROJECT_NAME} STATIC ${SRC_FILES} ${HEAD_FILES})
+endif()
+
 if(NOT MSVC)
   target_link_libraries(${PROJECT_NAME} PUBLIC
-      pthread
-      $<$<NOT:$<STREQUAL:${CMAKE_SYSTEM_NAME},Windows>>:rt>)
+    pthread
+    $<$<NOT:$<STREQUAL:${CMAKE_SYSTEM_NAME},Windows>>:rt>)
 endif()
 
 install(