你如何设置 CMAKE_C_COMPILER 和 CMAKE_CXX_COMPILER 来构建 Assimp for iOS？
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How do you set CMAKE_C_COMPILER and CMAKE_CXX_COMPILER for building Assimp for iOS?
提问by Curyous
When I try to build Assimp by running build_ios.sh, it tells me:
当我尝试通过运行构建 Assimp 时build_ios.sh，它告诉我：
CMake Error: your C compiler: "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc" was not found. Please set CMAKE_C_COMPILER to a valid compiler path or name.
CMake Error: your CXX compiler: "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++" was not found. Please set CMAKE_CXX_COMPILER to a valid compiler path or name.
What I need the path to be is:
我需要的路径是：
/Applications/XCode.app/Contents/Developer/Platforms/...
I've tried changing DEVROOTin build_ios.shand IPHONE_xxxx_TOOLCHAIN.cmake, because that's what CMAKE_C_COMPILERetc seem to get generated from, but it still gives me the same errors.
我试着改变DEVROOT的build_ios.sh和IPHONE_xxxx_TOOLCHAIN.cmake，因为那是什么CMAKE_C_COMPILER等似乎得到从产生，但它仍然给了我同样的错误。
回答by abi
Option 1:
选项1：
You can set CMake variables at command line like this:
您可以在命令行中设置 CMake 变量，如下所示：
cmake -D CMAKE_C_COMPILER="/path/to/your/c/compiler/executable" -D CMAKE_CXX_COMPILER "/path/to/your/cpp/compiler/executable" /path/to/directory/containing/CMakeLists.txt
See thisto learn how to create a CMake cache entry.
请参阅此内容以了解如何创建 CMake 缓存条目。
Option 2:
选项 2：
In your shell script build_ios.shyou can set environment variables CCand CXXto point to your C and C++ compiler executable respectively, example:
在您的 shell 脚本中，build_ios.sh您可以设置环境变量CC并CXX分别指向您的 C 和 C++ 编译器可执行文件，例如：
export CC=/path/to/your/c/compiler/executable
export CXX=/path/to/your/cpp/compiler/executable
cmake /path/to/directory/containing/CMakeLists.txt
Option 3:
选项 3：
Edit the CMakeLists.txt file of "Assimp": Add these lines at the top (must be added before you use project()or enable_language()command)
编辑“Assimp”的CMakeLists.txt文件：在顶部添加这些行（必须在使用project()或enable_language()命令之前添加）
set(CMAKE_C_COMPILER "/path/to/your/c/compiler/executable")
set(CMAKE_CXX_COMPILER "/path/to/your/cpp/compiler/executable")
See thisto learn how to use setcommand in CMake. Also thisis a useful resource for understanding use of some of the common CMake variables.
请参阅此内容以了解如何set在 CMake 中使用命令。另外这是了解使用的一些常见的CMake变量的一个有用的资源。
Here is the relevant entry from the official FAQ: https://gitlab.kitware.com/cmake/community/wikis/FAQ#how-do-i-use-a-different-compiler
这是官方常见问题解答中的相关条目：https: //gitlab.kitware.com/cmake/community/wikis/FAQ#how-do-i-use-a-different-compiler
回答by neoneye
The cc and cxx is located inside /Applications/Xcode.app. This should find the right paths
cc 和 cxx 位于/Applications/Xcode.app. 这应该找到正确的路径
export CXX=`xcrun -find c++`
export CC=`xcrun -find cc`
