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Add CMake option to link MSVC runtime statically #878

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Add CMake option to link MSVC runtime statically #878

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26 changes: 22 additions & 4 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,10 +1,16 @@
cmake_minimum_required(VERSION 2.4.4...3.15.0)
set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)

if(POLICY CMP0091)
cmake_policy(SET CMP0091 NEW)
endif()

project(zlib C)

set(VERSION "1.3.0.1")

option(ZLIB_STATIC_LINK_CRT "Link the MSVC runtime library statically" 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")
set(INSTALL_INC_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "Installation directory for headers")
Expand Down Expand Up @@ -76,12 +82,24 @@ if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
endif()

set(ZLIB_PC ${CMAKE_CURRENT_BINARY_DIR}/zlib.pc)
configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib.pc.cmakein
${ZLIB_PC} @ONLY)
configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.cmakein
${CMAKE_CURRENT_BINARY_DIR}/zconf.h @ONLY)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/zlib.pc.cmakein
${ZLIB_PC} @ONLY)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.cmakein
${CMAKE_CURRENT_BINARY_DIR}/zconf.h @ONLY)
include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_SOURCE_DIR})

if(POLICY CMP0091)
# CMake >= 3.15 has CMAKE_MSVC_RUNTIME_LIBRARY to set the MSVCC runtime library
if(WIN32 AND CMAKE_GENERATOR MATCHES "Visual Studio .*|NMake .*")
if(ZLIB_STATIC_LINK_CRT)
message(STATUS "Configuring to link the MSVC runtime library statically")
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
else()
message(STATUS "Configuring to link the MSVC runtime library dynamically")
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
endif()
endif()
endif()

#============================================================================
# zlib
Expand Down