initial commit

cmake/zlib.cmake

@@ -0,0 +1,22 @@
+if (MSVC)
+  set(ZLIB_PROJECT_NAME zlib_${ZLIB_VERSION})
+  set(ZLIB_BUILD_ROOT ${EXTERNAL_BUILD_ROOT}/builds/${ZLIB_PROJECT_NAME})
+  set(ZLIB_CMAKE_ARGS
+    -DCMAKE_BUILD_TYPE=${EXTERNAL_BUILD_TYPE}
+    -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    -DCMAKE_GENERATOR=${CMAKE_GENERATOR}
+    -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
+    -DCMAKE_SHARED_LINKER_FLAGS=${CMAKE_SHARED_LINKER_FLAGS}
+    -DCMAKE_POSITION_INDEPENDENT_CODE=ON
+    -DCMAKE_INSTALL_PREFIX=${EXTERNAL_BUILD_ROOT}
+  )
+  ExternalProject_Add(zlib_project
+    DOWNLOAD_NO_PROGRESS 1
+    URL https://github.com/madler/zlib/archive/${ZLIB_VERSION}.tar.gz
+    PREFIX ${ZLIB_BUILD_ROOT}
+    CMAKE_ARGS ${ZLIB_CMAKE_ARGS}
+  )
+  set(ZLIB_LIBRARIES ${EXTERNAL_BUILD_ROOT}/lib/zlibstatic${DEBUG_EXTRA}.lib)
+elseif(LINUX)
+  set(ZLIB_LIBRARIES libz.a)
+endif()