在x64 Windows上使用CMake，Ninja和Clang构建x86应用程序 [英] Building a x86 application with CMake, Ninja and Clang on x64 Windows

问题描述

我想在x64 Windows计算机上构建一个x86 Windows应用程序.

I want to build an x86 Windows application on my x64 Windows machine.

我将CMake，Ninja，clang-cl，lld-link和VS Build Tools 2017与以下CMakeLists一起使用

I use CMake, Ninja, clang-cl, lld-link and the VS Build Tools 2017 with the following 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.我用vcvars64初始化构建环境，并用

My setup works fine for x64 applications. I initialise the build environment with vcvars64 and call cmake with

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

这将产生完美的忍者构建文件，并生成可运行的可执行文件.

This results in perfectly fine ninja build files and produces a functional executable.

如果我要构建x86应用程序，则CMake无法检测到构建环境.我用vcvars32或vcvarsamd64_x86初始化构建环境，并使用与上述相同的命令来调用CMake.这会在检测构建环境期间导致错误.

If I want to build an x86 application, CMake failes to detect the build environment. I initialise the build environment with vcvars32 or vcvarsamd64_x86 and use the same command as above to invoke CMake. This results in errors during the detection of the build environment.

CMake错误日志包含以下内容

The CMake error log has the following content

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，问题在于CMake将/machine:x64传递给链接器.

As far as I understand, the problem is that CMake passes /machine:x64 to the linker.

我应该对CMake调用或CMakeList进行哪些修改以解决此问题?

Which modifications should I make to the CMake invocation or the CMakeLists to solve this problem?

非常感谢您的帮助.谢谢大家:-)

Any help is very much appreciated. Thank you guys :-)

推荐答案

CMake问题# 16259:当混合使用64/32位clang和Visual Studio Environment时，忍者生成器在clang-cl中失败" 建议利用环境变量:

Ninja生成器要求已经为编译器配置了环境，以生成所需的目标.你需要做

The Ninja generator requires that the environment already be configured for the compiler to produce the desired target. You need to do

>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.

to tell CMake how to invoke the compiler for the desired target.

这篇关于在x64 Windows上使用CMake，Ninja和Clang构建x86应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！