MinGW/CMake 对 ZLib 的未定义引用答案

【问题标题】：MinGW/CMake Undefined Reference to ZLibMinGW/CMake 对 ZLib 的未定义引用
【发布时间】：2016-03-21 08:43:32
【问题描述】：

我有一个项目，我想用 CMake 构建并用 MinGW 编译。该项目使用 Zlib。当我使用 CMake 构建时，我没有收到任何错误，但是当我运行 MinGW Make 时，它会给出以下输出：

C:\Projects\MultiMCBuild>C:\Qt\Tools\mingw492_32\bin\mingw32-make.exe
.
.
.
[ 50%] Linking CXX shared library ..\libMultiMC_logic.dll
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x1f6c): undefined reference to 'z_inflateEnd'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x29e2): undefined reference to 'z_inflateInit2_'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x2a6d): undefined reference to 'z_get_crc_table'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x2ca7): undefined reference to 'z_inflateEnd'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x2f52): undefined reference to 'z_inflateInit2_'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x2f77): undefined reference to 'z_inflateEnd'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x3239): undefined reference to 'z_inflateInit2_'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x3317): undefined reference to 'z_inflateEnd'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x3626): undefined reference to 'z_crc32'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x371f): undefined reference to 'z_inflate'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x376a): undefined reference to 'z_crc32'
C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):unzip.c:(.text+0x3a57): undefined reference to 'z_inflateEnd'
C:/Qt/Tools/mingw492_32/bin/../lib/gcc/i686-w64-    mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: C:/Projects/MultiMCBuild/External/Install/QuaZIP/lib/libquazip.a(unzip.c.obj):     bad reloc address 0x20 in section `.eh_frame'
collect2.exe: error: ld returned 1 exit status
logic\CMakeFiles\MultiMC_logic.dir\build.make:3186: recipe for target 'libMultiMC_logic.dll' failed
mingw32-make[2]: * * * [libMultiMC_logic.dll] Error 1
CMakeFiles\Makefile2:1806: recipe for target 'logic/CMakeFiles/MultiMC_logic.dir/all' failed
mingw32-make[1]: * * * [logic/CMakeFiles/MultiMC_logic.dir/all] Error 2
makefile:159: recipe for target 'all' failed
mingw32-make: * * * [all] Error 2

有人知道我能做些什么来解决这个问题吗？看了代码找不到ZLib库，怎么链接？

编辑 here 是我的 CMakeLists.txt。这是我从 Git 项目中得到的。

【问题讨论】：

您是否也使用相同的编译器构建了 zlib？（如果没有，就这样做）
您能否添加您的CMakeLists.txt 文件的最小示例？它可能只是缺少依赖项（如果 ZLib 也是使用 CMake 构建的），也可能是缺少二进制文件（如果是预构建），或者通常在您的 CMake 配置中完全缺少对 ZLib 的引用。它可以与其他编译器一起使用吗？
我下载了 ZLib 编译的 DLL，还从 Git 存储库克隆了项目。一切都表明我的环境有问题
@user3099265 我查看了您的CMakeLists.txt，似乎更多的是“如何集成 QuaLIB”的问题。并且缺少MultiMC_logic 的部分（可能是Application 子目录的一部分？）。那么请您提供一个仅包含QuaLIB 部分的最小可复制示例吗？另请参阅help center。

标签： c++ cmake mingw zlib

【解决方案1】：

我只是尝试生成一个小示例来重现您的错误。我从zlibhttp://zlib.net/zpipe.c的主页上拿了我的测试文件

我最初的CMakeLists.txt 是

cmake_minimum_required(VERSION 3.4)
project(zlib_test)
set(ZLIB_TEST_SOURCES zpipe.c)
add_executable(${PROJECT_NAME} ${ZLIB_TEST_SOURCES})

我也遇到了同样的错误

[ 50%] Building C object CMakeFiles/zlib_test.dir/zpipe.c.o
[100%] Linking C executable zlib_test
CMakeFiles/zlib_test.dir/zpipe.c.o: In function `def':
zpipe.c:(.text+0x65): undefined reference to `deflateInit_'
zpipe.c:(.text+0xcd): undefined reference to `deflateEnd'
zpipe.c:(.text+0x135): undefined reference to `deflate'
zpipe.c:(.text+0x1cf): undefined reference to `deflateEnd'
zpipe.c:(.text+0x25d): undefined reference to `deflateEnd'
CMakeFiles/zlib_test.dir/zpipe.c.o: In function `inf':
zpipe.c:(.text+0x2eb): undefined reference to `inflateInit_'
zpipe.c:(.text+0x353): undefined reference to `inflateEnd'
zpipe.c:(.text+0x3a4): undefined reference to `inflate'
zpipe.c:(.text+0x404): undefined reference to `inflateEnd'
zpipe.c:(.text+0x476): undefined reference to `inflateEnd'
zpipe.c:(.text+0x4a6): undefined reference to `inflateEnd'
collect2: error: ld returned 1 exit status
make[2]: *** [zlib_test] Error 1
make[1]: *** [CMakeFiles/zlib_test.dir/all] Error 2
make: *** [all] Error 2

将CMakeLists.txt改成这种形式后

cmake_minimum_required(VERSION 3.4)
project(zlib_test)

find_package(ZLIB REQUIRED)
if (ZLIB_FOUND)
    include_directories(${ZLIB_INCLUDE_DIRS})
endif()

set(ZLIB_TEST_SOURCES zpipe.c)

add_executable(${PROJECT_NAME} ${ZLIB_TEST_SOURCES})
target_link_libraries(${PROJECT_NAME} ${ZLIB_LIBRARIES})

我可以编译程序。

所以您的问题是：ZLIB 在您的CMakeLists.txt 中添加到哪里？至少，你需要find_package(ZLIB REQUIRED)这一行。

【讨论】：