在x64 Windows上使用CMake,Ninja和Clang构建x86应用程序

时间:2017-11-30 20:10:21

标签: windows architecture cmake clang ninja

我想在x64 Windows机器上构建一个x86 Windows应用程序。

我使用CMake,Ninja,clang-cl,lld-link和VS Build Tools 2017以及以下CMakeLists

cmake_minimum_required(VERSION 3.9)
project(Test CXX)

add_library(TestLib STATIC "")
target_include_directories(TestLib
  PUBLIC
TestLib/inc
)
target_sources(TestLib
  PRIVATE
    TestLib/src/Flop.cpp
    TestLib/src/testClass.cpp
)

add_executable(Test "")
target_sources(Test
  PRIVATE
    src/main.cpp
)
target_link_libraries(Test
  TestLib
)

我的设置适用于x64应用程序。我使用vcvars64初始化构建环境,并使用

调用cmake
cmake -G Ninja -DCMAKE_CXX_COMPILER:PATH="C:\MeineProgramme\LLVM\bin\clang-cl.exe" -DCMAKE_LINKER:PATH="C:\MeineProgramme\LLVM\bin\lld-link.exe"

这会产生完美的忍者构建文件并生成功能可执行文件。

如果我想构建一个x86应用程序,CMake很容易检测构建环境。我使用vcvars32vcvarsamd64_x86初始化构建环境,并使用与上面相同的命令来调用CMake。这会在检测构建环境期间导致错误。

CMake错误日志具有以下内容

Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: C:/MeineProgramme/LLVM/bin/clang-cl.exe 
Build flags: 
Id flags:  

The output was:
1120
LINK : error LNK2001: Nicht aufgelöstes externes Symbol "mainCRTStartup".
C:\MeineProgramme\Visual_Studio\2017\BuildTools\VC\Tools\MSVC\14.11.25503\lib\x86\libcmt.lib : warning LNK4272:Bibliothekcomputertyp "x86" steht in Konflikt mit dem Zielcomputertyp "x64"
CMakeCXXCompilerId.exe : fatal error LNK1120: 1 nicht aufgelöste Externe
clang-cl.exe: error: linker command failed with exit code 1120 (use -v to see invocation)


Determining if the CXX compiler works failed with the following output:
Change Dir: D:/Dateien/Downloads/Test/build/CMakeFiles/CMakeTmp

Run Build Command:"C:/MeineProgramme/Ninja/bin/ninja.exe" "cmTC_e2ed5"
[1/2] Building CXX object CMakeFiles\cmTC_e2ed5.dir\testCXXCompiler.cxx.obj

[2/2] Linking CXX executable cmTC_e2ed5.exe

FAILED: cmTC_e2ed5.exe 

cmd.exe /C "cd . && C:\MeineProgramme\CMake\bin\cmake.exe -E vs_link_exe --intdir=CMakeFiles\cmTC_e2ed5.dir --manifests  -- C:\MeineProgramme\LLVM\bin\lld-link.exe /nologo CMakeFiles\cmTC_e2ed5.dir\testCXXCompiler.cxx.obj  /out:cmTC_e2ed5.exe /implib:cmTC_e2ed5.lib /pdb:cmTC_e2ed5.pdb /version:0.0  /machine:x64  /debug /INCREMENTAL /subsystem:console  kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib && cd ."

LINK Pass 1: command "C:\MeineProgramme\LLVM\bin\lld-link.exe /nologo CMakeFiles\cmTC_e2ed5.dir\testCXXCompiler.cxx.obj /out:cmTC_e2ed5.exe /implib:cmTC_e2ed5.lib /pdb:cmTC_e2ed5.pdb /version:0.0 /machine:x64 /debug /INCREMENTAL /subsystem:console kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:CMakeFiles\cmTC_e2ed5.dir/intermediate.manifest CMakeFiles\cmTC_e2ed5.dir/manifest.res" failed (exit code 1) with the following output:
C:\MeineProgramme\LLVM\bin\lld-link.exe: warning: <root>: undefined symbol: mainCRTStartup

error: link failed

ninja: build stopped: subcommand failed.

据我了解,问题是CMake将/machine:x64传递给链接器。

我应该对CMake调用或CMakeLists进行哪些修改来解决这个问题?

非常感谢任何帮助。谢谢你们: - )

1 个答案:

答案 0 :(得分:1)

CMake Issue #16259: "Ninja generator fails with clang-cl when mixing 64/32 bit clang and Visual Studio Environment"建议使用环境变量:

  

Ninja生成器要求已为编译器配置环境以生成所需目标。你需要做

>set CC=clang-cl
>set CFLAGS=-m32
>set CXX=clang-cl
>set CXXFLAGS=-m32
     

告诉CMake如何为所需目标调用编译器。