From 3b8cf47307c65f6adfe20e13e85e074a8e5cc044 Mon Sep 17 00:00:00 2001
From: kinichiro <kinichiro.inoguchi@gmail.com>
Date: Tue, 17 Jan 2017 21:27:41 +0900
Subject: [PATCH] Add export symbol support to CMake

---
 CMakeLists.txt            |  3 +++
 Makefile.am               |  2 +-
 cmake_export_symbol.cmake | 41 +++++++++++++++++++++++++++++++++++++++
 ssl/CMakeLists.txt        |  3 +--
 tls/CMakeLists.txt        |  3 +--
 5 files changed, 47 insertions(+), 5 deletions(-)
 create mode 100644 cmake_export_symbol.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9cf14de..558a6f5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,9 @@ include(CheckLibraryExists)
 include(CheckIncludeFiles)
 include(CheckTypeSize)
 
+set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}" ${CMAKE_MODULE_PATH})
+include(cmake_export_symbol)
+
 project (LibreSSL C)
 
 enable_testing()
diff --git a/Makefile.am b/Makefile.am
index 48da18b..b4b9dfc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,7 +5,7 @@ pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libcrypto.pc libssl.pc libtls.pc openssl.pc
 
 EXTRA_DIST = README.md README.windows VERSION config scripts
-EXTRA_DIST += CMakeLists.txt cmake_uninstall.cmake.in
+EXTRA_DIST += CMakeLists.txt cmake_export_symbol.cmake cmake_uninstall.cmake.in
 
 .PHONY: install_sw
 install_sw: install
diff --git a/cmake_export_symbol.cmake b/cmake_export_symbol.cmake
new file mode 100644
index 0000000..7dde938
--- /dev/null
+++ b/cmake_export_symbol.cmake
@@ -0,0 +1,41 @@
+macro(export_symbol TARGET FILENAME)
+
+	set(FLAG "")
+
+	if(WIN32)
+		string(REPLACE ".sym" ".def" DEF_FILENAME ${FILENAME})
+		target_sources(${TARGET} PRIVATE ${DEF_FILENAME})
+
+	elseif(APPLE)
+		set(FLAG "-exported_symbols_list ${FILENAME}")
+		set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
+
+	elseif(CMAKE_SYSTEM_NAME MATCHES "HP-UX")
+		file(READ ${FILENAME} SYMBOLS)
+		string(REGEX REPLACE "\n$" "" SYMBOLS ${SYMBOLS})
+		string(REPLACE "\n" "\n+e " SYMBOLS ${SYMBOLS})
+		string(REPLACE ".sym" ".opt" OPT_FILENAME ${FILENAME})
+		file(WRITE ${OPT_FILENAME} "+e ${SYMBOLS}")
+		set(FLAG "-Wl,-c,${OPT_FILENAME}")
+		set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
+
+	elseif(CMAKE_SYSTEM_NAME MATCHES "SunOS")
+		file(READ ${FILENAME} SYMBOLS)
+		string(REPLACE "\n" ";\n" SYMBOLS ${SYMBOLS})
+		string(REPLACE ".sym" ".ver" VER_FILENAME ${FILENAME})
+		file(WRITE ${VER_FILENAME}
+			"{\nglobal:\n${SYMBOLS}\nlocal:\n*;\n};\n")
+		set(FLAG "-Wl,-M${VER_FILENAME}")
+		set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
+
+	elseif(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
+		file(READ ${FILENAME} SYMBOLS)
+		string(REPLACE "\n" ";\n" SYMBOLS ${SYMBOLS})
+		string(REPLACE ".sym" ".ver" VER_FILENAME ${FILENAME})
+		file(WRITE ${VER_FILENAME}
+			"{\nglobal:\n${SYMBOLS}\nlocal:\n*;\n};\n")
+		set(FLAG "-Wl,--version-script,\"${VER_FILENAME}\"")
+		set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
+	endif()
+
+endmacro()
diff --git a/ssl/CMakeLists.txt b/ssl/CMakeLists.txt
index d511c8e..67115e4 100644
--- a/ssl/CMakeLists.txt
+++ b/ssl/CMakeLists.txt
@@ -52,9 +52,8 @@ add_library(ssl-objects OBJECT ${SSL_SRC})
 if (BUILD_SHARED)
 	add_library(ssl STATIC $<TARGET_OBJECTS:ssl-objects>)
 	add_library(ssl-shared SHARED $<TARGET_OBJECTS:ssl-objects>)
+	export_symbol(ssl-shared ${CMAKE_CURRENT_SOURCE_DIR}/ssl.sym)
 	if (WIN32)
-		target_sources(ssl-shared PRIVATE
-			${CMAKE_CURRENT_SOURCE_DIR}/ssl.def)
 		target_link_libraries(ssl-shared crypto-shared Ws2_32.lib)
 		set(SSL_POSTFIX -${SSL_MAJOR_VERSION})
 	endif()
diff --git a/tls/CMakeLists.txt b/tls/CMakeLists.txt
index 1f78038..dcefad7 100644
--- a/tls/CMakeLists.txt
+++ b/tls/CMakeLists.txt
@@ -33,9 +33,8 @@ add_library(tls-objects OBJECT ${TLS_SRC})
 if (BUILD_SHARED)
 	add_library(tls STATIC $<TARGET_OBJECTS:tls-objects>)
 	add_library(tls-shared SHARED $<TARGET_OBJECTS:tls-objects>)
+	export_symbol(tls-shared ${CMAKE_CURRENT_SOURCE_DIR}/tls.sym)
 	if (WIN32)
-		target_sources(tls-shared PRIVATE
-			${CMAKE_CURRENT_SOURCE_DIR}/tls.def)
 		target_link_libraries(tls-shared ssl-shared crypto-shared Ws2_32.lib)
 		set(TLS_POSTFIX -${TLS_MAJOR_VERSION})
 	endif()