如何部分禁用 cmake C/C++ 自定义编译器检查

2021-12-26 00:00:00 compilation c cmake c++

我正在尝试使用 cmake 进行一些交叉编译.互联网上的所有示例都很容易，我设法在 Linux(x86 和 ARM)、Windows 和 Android 上交叉编译了我的库.但现在我想在自定义平台上进行.

I am trying to do some crosscompilation using cmake. Some are easy with all the examples on Internet, I managed to crosscompile my library on Linux (x86 and ARM), Windows and Android. But now I would like to do it on a custom platform.

我需要实现的过程:

  1. 采购我的环境(这会破坏所有以前的 bash 经典环境)
  2. 用cmake编译
  3. 执行我想要的

但是 Cmake 正在测试我的自定义 C/C++ 库中的符号，这使我的库无法编译.我遇到的错误是 cmake 某些版本的 GLIBCXX 和 CXXABI(没有 C 问题)但不是全部.

But Cmake is testing for symbols in my custom C/C++ libraries which make my library unable to compile. The errors I have are that cmake some versions of GLIBCXX and CXXABI (no C issues) but not all of them.

有没有办法让 cmake 可以使用它?

Is there a way to make cmake ok with it ?

我尝试使用:

set(CMAKE_C_COMPILER_WORKS TRUE)
set(CMAKE_CXX_COMPILER_WORKS TRUE)

还有:

include(CMakeForceCompiler)
...
cmake_force_c_compiler(${ENV_PATH}/bin/${CC})
cmake_force_cxx_compiler(${ENV_PATH}/bin/${CXX})

但 cmake 仍在检查符号.

But cmake is still checking for symbols.

推荐答案

如果没有您的环境和错误消息，就不容易说出真正的根本原因，但这里有两个常见原因和相应的修复:

Without having your environment nor the error message it's not easy to tell the actual root cause but here are two of the common causes and respective fixes:

  1. 如果您没有完整的为您的自定义环境创建的工具链文件 - 因此 CMake 无法链接简单的测试程序 - 您可以尝试名为 CMAKE_TRY_COMPILE_TARGET_TYPE.

  1. If you don't have a complete toolchain file created for your custom environment - so CMake can't link a simple test program - you can try the relatively new (version 3.6) global CMake variable named CMAKE_TRY_COMPILE_TARGET_TYPE.

所以只需添加以下内容:

So just add the following:

set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)

然后 CMake 会尝试构建一个静态库.

Then CMake would just try to build a static library.

要仅设置最常见的 GCC 编译器变量并仅进行一些基本检查，请尝试:

To have only the most common GCC compiler variables set and have only some basic checks, try: 

SET(CMAKE_SYSTEM_NAME Generic)

参见 CMake 交叉编译:设置系统和工具链:

如果您的目标是没有操作系统的嵌入式系统，请将 CMAKE_SYSTEM_NAME 设置为通用"

If your target is an embedded system without OS set CMAKE_SYSTEM_NAME to "Generic"

参考资料

  • CMake AMRCC + 自定义链接器
  • cmake 使用特定链接器进行交叉编译不向 armlink 传递参数

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