如何用clang和cmake编译zlib

Question

我尝试在Windows 64上用cmake和clang (8.0)构建zlib。我做了这些步骤：

mkdir build.clang
cd build.clang
call "c:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x64
cmake -E env LDFLAGS="-fuse-ld=lld" cmake -H. -G Ninja ^
  -DCMAKE_C_COMPILER:PATH="C:\Program Files\LLVM\bin\clang-cl.exe" ^
  -DCMAKE_C_COMPILER_ID="Clang" ^
  -DCMAKE_AR="c:\Program Files\LLVM\bin\llvm-ar.exe" ^
  -DCMAKE_SYSTEM_NAME="Generic" ..

配置运行良好(不包括声称不可能构建共享库，但这不是目前的问题)：

-- The C compiler identification is Clang
-- Check for working C compiler: C:/Program Files/LLVM/bin/clang-cl.exe
-- Check for working C compiler: C:/Program Files/LLVM/bin/clang-cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Detecting C compile features
-- Detecting C compile features - done CMake Warning (dev) at CMakeLists.txt:186 (add_library):   ADD_LIBRARY called with SHARED option but the target platform does not   support dynamic linking.  Building a STATIC library instead.  This may lead   to problems. This warning is for project developers.  Use -Wno-dev to suppress it. 
 -- Configuring done
 -- Generating done
 -- Build files have been written to: F:/Project-tests/clang_lept/zlib-1.2.11/build.clang

但是，生成失败：

cmake --build . --config Release
[1/36] Building C object CMakeFiles/zlib.dir/crc32.obj
FAILED: CMakeFiles/zlib.dir/crc32.obj
C:\PROGRA~1\LLVM\bin\clang-cl.exe -DNO_FSEEKO -I. -I../  -MD -MT CMakeFiles/zlib.dir/crc32.obj -MF CMakeFiles\zlib.dir\crc32.obj.d -o CMakeFiles/zlib.dir/crc32.obj   -c ../crc32.c
clang-cl: warning: unknown argument ignored in clang-cl: '-MF' [-Wunknown-argument]
clang-cl: error: no such file or directory: 'CMakeFiles/zlib.dir/crc32.obj'
clang-cl: error: no such file or directory: 'CMakeFiles\zlib.dir\crc32.obj.d'
[2/36] Building C object CMakeFiles/zlib.dir/gzread.obj
FAILED: CMakeFiles/zlib.dir/gzread.obj
C:\PROGRA~1\LLVM\bin\clang-cl.exe -DNO_FSEEKO -I. -I../  -MD -MT CMakeFiles/zlib.dir/gzread.obj -MF CMakeFiles\zlib.dir\gzread.obj.d -o CMakeFiles/zlib.dir/gzread.obj   -c ../gzread.c
clang-cl: warning: unknown argument ignored in clang-cl: '-MF' [-Wunknown-argument]
clang-cl: error: no such file or directory: 'CMakeFiles/zlib.dir/gzread.obj'
clang-cl: error: no such file or directory: 'CMakeFiles\zlib.dir\gzread.obj.d'
[3/36] Building C object CMakeFiles/zlib.dir/compress.obj
FAILED: CMakeFiles/zlib.dir/compress.obj
C:\PROGRA~1\LLVM\bin\clang-cl.exe -DNO_FSEEKO -I. -I../  -MD -MT CMakeFiles/zlib.dir/compress.obj -MF CMakeFiles\zlib.dir\compress.obj.d -o CMakeFiles/zlib.dir/compress.obj   -c ../compress.c
clang-cl: warning: unknown argument ignored in clang-cl: '-MF' [-Wunknown-argument]
clang-cl: error: no such file or directory: 'CMakeFiles/zlib.dir/compress.obj'
clang-cl: error: no such file or directory: 'CMakeFiles\zlib.dir\compress.obj.d'
[4/36] Building C object CMakeFiles/zlib.dir/adler32.obj
FAILED: CMakeFiles/zlib.dir/adler32.obj
C:\PROGRA~1\LLVM\bin\clang-cl.exe -DNO_FSEEKO -I. -I../  -MD -MT CMakeFiles/zlib.dir/adler32.obj -MF CMakeFiles\zlib.dir\adler32.obj.d -o CMakeFiles/zlib.dir/adler32.obj   -c ../adler32.c
clang-cl: warning: unknown argument ignored in clang-cl: '-MF' [-Wunknown-argument]
clang-cl: error: no such file or directory: 'CMakeFiles/zlib.dir/adler32.obj'
clang-cl: error: no such file or directory: 'CMakeFiles\zlib.dir\adler32.obj.d'
[5/36] Building C object CMakeFiles/zlib.dir/gzclose.obj
FAILED: CMakeFiles/zlib.dir/gzclose.obj
C:\PROGRA~1\LLVM\bin\clang-cl.exe -DNO_FSEEKO -I. -I../  -MD -MT CMakeFiles/zlib.dir/gzclose.obj -MF CMakeFiles\zlib.dir\gzclose.obj.d -o CMakeFiles/zlib.dir/gzclose.obj   -c ../gzclose.c
clang-cl: warning: unknown argument ignored in clang-cl: '-MF' [-Wunknown-argument]
clang-cl: error: no such file or directory: 'CMakeFiles/zlib.dir/gzclose.obj'
clang-cl: error: no such file or directory: 'CMakeFiles\zlib.dir\gzclose.obj.d'
[6/36] Building C object CMakeFiles/zlib.dir/gzlib.obj
FAILED: CMakeFiles/zlib.dir/gzlib.obj
C:\PROGRA~1\LLVM\bin\clang-cl.exe -DNO_FSEEKO -I. -I../  -MD -MT CMakeFiles/zlib.dir/gzlib.obj -MF CMakeFiles\zlib.dir\gzlib.obj.d -o CMakeFiles/zlib.dir/gzlib.obj   -c ../gzlib.c
clang-cl: warning: unknown argument ignored in clang-cl: '-MF' [-Wunknown-argument]
clang-cl: error: no such file or directory: 'CMakeFiles/zlib.dir/gzlib.obj'
clang-cl: error: no such file or directory: 'CMakeFiles\zlib.dir\gzlib.obj.d'
ninja: build stopped: subcommand failed.

当我试图使用GCC兼容的clang -构建也失败了，但在连接过程中.

PS: build 2017 (cmake .. -G "Visual Studio 15 2017 Win64")没有问题.

Answer 1

所以看起来“越少越好”;-)。下面是使用忍者、clang和cmake构建zlib的步骤(安装时必须以admin的形式运行)：

set CC=clang-cl
set CFLAGS=-m64 -fmsc-version=1915
call "c:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x64
cmake .. -G Ninja  -DCMAKE_INSTALL_PREFIX="C:\Program Files\zlib"
cmake --build . --config Release --target install
cmake --build . --config Debug --target install

我需要指定CMAKE_INSTALL_PREFIX，否则cmake将将64位zlib安装到"C:/Program (x86)“

Answer 2

您需要设置更多的环境变量。

set CC=clang-cl
set CXX=clang-cl
set CFLAGS=-m64 -fmsc-version=<your vs version>
set CXXFLAGS=-m64 -fmsc-version=<your vs version>

或者在您的cmake电话中传递它们。