强制使用CMake的32位编译的正确方法 [英] The proper way of forcing a 32-bit compile using CMake

问题描述

对不起，有很多类似的问题，但我确实发现，谷歌的CMake查询总是产生类似但不是相同的场景，冲突的CMake命令等！

我需要强制我的项目构建32位二进制文​​件，因为我必须链接一个库，只有可用的32位。我诊断这是基于错误消息，如：

  / usr / bin / ld：i386架构的输入文件` 32bit-lib *'与i386不兼容：x86-64输出
  

因此，请使用：

  set（CMAKE_CXX_FLAGS-m32）
  

这改变了事情 - 我现在得到几个错误，如：

  / usr / bin / ld：i386输入文件架构`* project-output-lib *'与i386不兼容：x86-64 output 
  

仍然会得到与外部库相同的错误。 I 这是因为 -m32 使gcc生成32位二进制文​​件，但ld仍在尝试64位输出？进一步谷歌这个问题没有任何成功，所以如果任何人可以验证我是对的，并给正确的方式这样做，我会非常感谢！

非常感谢！

解决方案

如果你想编译和链接32位使用cmake使用这个创建库和二进制： / p>

创建库：

  add_library（mylib SHARED my_source.c）
 set_target_properties（mylib PROPERTIES COMPILE_FLAGS-m32LINK_FLAGS-m32）
  

  add_executable（mybin sources.c）
 set_target_properties（mybin PROPERTIES COMPILE_FLAGS-m32LINK_FLAGS-m32） 
  

希望这有帮助，

Sorry that there are many similar questions, but I do find that Googling for CMake queries always yields similar-but-not-the-same scenarios, conflicting CMake commands and so on!

I need to force my project to build 32-bit binaries because I have to link with a library which is only available as 32-bit. I diagnosed this based on error messages such as:

/usr/bin/ld: i386 architecture of input file `*external-32bit-lib*' is incompatible with i386:x86-64 output

From what I gather, I should therefore use:

set (CMAKE_CXX_FLAGS "-m32")

This does change things - I now get several errors like:

/usr/bin/ld: i386 architecture of input file `*project-output-lib*' is incompatible with i386:x86-64 output

AND still get the same errors for the external library too. I think this is because the -m32 made gcc generate 32-bit binaries, but ld is still trying for 64-bit output? Further Googling for this problem didn't give any success, so if anyone could verify that I am right and give the correct way of doing this, I would be very grateful!

Many thanks!

解决方案

If you want to compile and link for 32 bit using cmake use this for creating libraries and binaries:

Creating libraries:

add_library(mylib SHARED my_source.c)
set_target_properties(mylib PROPERTIES COMPILE_FLAGS "-m32" LINK_FLAGS "-m32")

creating executables:

add_executable(mybin sources.c)
set_target_properties(mybin PROPERTIES COMPILE_FLAGS "-m32" LINK_FLAGS "-m32")

Hope this helps,

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