From b3907c2cd99908259c71fab6754f88e25d370fed Mon Sep 17 00:00:00 2001
From: Vollstrecker <werner@vollstreckernet.de>
Date: Sat, 30 Nov 2024 16:19:11 +0100
Subject: CMake: Add options for shared and static build.

---
 CMakeLists.txt | 63 +++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 43 insertions(+), 20 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d9b58d..648f2c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,8 @@ project(zlib C)
 set(VERSION "1.3.1.1")
 
 option(ZLIB_BUILD_EXAMPLES "Enable Zlib Examples" ON)
+option(ZLIB_BUILD_SHARED "Enable building zlib shared library" ON)
+option(ZLIB_BUILD_STATIC "Enable building zlib static library" ON)
 
 set(INSTALL_BIN_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Installation directory for executables")
 set(INSTALL_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE PATH "Installation directory for libraries")
@@ -150,18 +152,23 @@ if(MINGW)
     set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
 endif(MINGW)
 
-add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
-target_include_directories(zlib PUBLIC
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
-add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
-target_include_directories(zlibstatic PUBLIC
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
-set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
-set_target_properties(zlib PROPERTIES SOVERSION 1)
-
-if(NOT CYGWIN)
+if(ZLIB_BUILD_SHARED)
+    add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
+    target_include_directories(zlib PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
+    set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
+    set_target_properties(zlib PROPERTIES SOVERSION 1)
+endif(ZLIB_BUILD_SHARED)
+
+if(ZLIB_BUILD_STATIC)
+    add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
+    target_include_directories(zlibstatic PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
+endif(ZLIB_BUILD_STATIC)
+
+if(NOT CYGWIN AND ZLIB_BUILD_SHARED)
     # This property causes shared libraries on Linux to have the full version
     # encoded into their final filename.  We disable this on Cygwin because
     # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll
@@ -174,20 +181,36 @@ endif()
 
 if(UNIX)
     # On unix-like platforms the library is almost always called libz
-   set_target_properties(zlib zlibstatic PROPERTIES OUTPUT_NAME z)
-   if(NOT APPLE AND NOT(CMAKE_SYSTEM_NAME STREQUAL AIX))
-     set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
-   endif()
+    if(ZLIB_BUILD_SHARED)
+        set_target_properties(zlib PROPERTIES OUTPUT_NAME z)
+        if(NOT APPLE AND NOT(CMAKE_SYSTEM_NAME STREQUAL AIX))
+            set_target_properties(zlib PROPERTIES
+                LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
+        endif()
+    endif(ZLIB_BUILD_SHARED)
+
+    if(ZLIB_BUILD_STATIC)
+        set_target_properties(zlibstatic PROPERTIES OUTPUT_NAME z)
+    endif(ZLIB_BUILD_STATIC)
 elseif(BUILD_SHARED_LIBS AND WIN32)
     # Creates zlib1.dll when building shared library version
     set_target_properties(zlib PROPERTIES SUFFIX "1.dll")
 endif()
 
 if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
-    install(TARGETS zlib zlibstatic
-        RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
-        ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
-        LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )
+    if(ZLIB_BUILD_SHARED)
+        install(TARGETS zlib
+            RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
+            ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
+            LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )
+    endif(ZLIB_BUILD_SHARED)
+
+    if(ZLIB_BUILD_STATIC)
+        install(TARGETS zlibstatic
+            RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
+            ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
+            LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )
+    endif(ZLIB_BUILD_STATIC)
 endif()
 if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
     install(FILES ${ZLIB_PUBLIC_HDRS} DESTINATION "${INSTALL_INC_DIR}")
-- 
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