Respect static for zlib with CMake

build/CMakeLists.txt

@@ -238,8 +238,12 @@ if (NOT ZLIB_FOUND )
   include( ExternalProject )
   ExternalProject_Add(zlib-project
     URL http://zlib.net/zlib-1.2.8.tar.gz
+    URL_MD5 44d667c142d7cda120332623eab69f40
     PREFIX ${CMAKE_CURRENT_BINARY_DIR}/zlib
+    # patch on Windows might be found in C:/Program Files/Git/usr/bin
+    PATCH_COMMAND patch -p0 < ${CMAKE_CURRENT_SOURCE_DIR}/cmake-zlib-static.patch
     CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
+      -DWITH_STATIC=${WITH_STATIC}
       -DAMD64=ON -DASM686=ON "-DCMAKE_ASM_MASM_FLAGS=/W0 /safeseh"
     )
   if (WITH_PCH)
@@ -249,9 +253,14 @@ if (NOT ZLIB_FOUND )
   endif ()
   # ExternalProject_Get_Property(zlib-project install_dir)
   set ( ZLIB_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/zlib/include" CACHE FILEPATH "zlib include dir" FORCE)
-  set ( ZLIB_LIBRARY debug zlibd optimized zlib CACHE STRING "zlib libraries" FORCE)
+  if (NOT WITH_STATIC)
+    set ( ZLIB_LIBRARY debug zlibd optimized zlib CACHE STRING "zlib libraries" FORCE)
+  endif ()
+endif ()
+if (WITH_STATIC AND (MSVC OR MSYS))
+  set ( ZLIB_LIBRARY debug zlibstaticd optimized zlibstatic CACHE STRING "zlib libraries" FORCE)
 endif ()
-link_directories("${CMAKE_CURRENT_BINARY_DIR}/zlib/lib")
+link_directories(${CMAKE_CURRENT_BINARY_DIR}/zlib/lib ${ZLIB_ROOT}/lib)
 
 # load includes
 include_directories( ${Boost_INCLUDE_DIRS} ${OPENSSL_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} )

build/cmake-zlib-static.patch

@@ -0,0 +1,28 @@
+--- CMakeLists.txt.orig	2013-04-28 17:57:10.000000000 -0500
++++ CMakeLists.txt	2015-12-03 12:53:52.371087900 -0600
+@@ -7,6 +7,7 @@
+ 
+ option(ASM686 "Enable building i686 assembly implementation")
+ option(AMD64 "Enable building amd64 assembly implementation")
++option(WITH_STATIC    "Static runtime on Windows" OFF)
+ 
+ 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")
+@@ -66,6 +67,17 @@
+     include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+ endif()
+ 
++if(WITH_STATIC AND (MSVC OR MSYS))
++    # http://www.cmake.org/Wiki/CMake_FAQ#Dynamic_Replace
++    foreach(flag_var
++            CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
++            CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)
++      if(${flag_var} MATCHES "/MD")
++        string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
++      endif(${flag_var} MATCHES "/MD")
++    endforeach(flag_var)
++endif()
++
+ if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
+     # If we're doing an out of source build and the user has a zconf.h
+     # in their source tree...