使用 CMake (Linux Mint) 编译时如何修复 "No known features for CXX compiler"
How do I fix the "No known features for CXX compiler" while compiling with CMake (Linux Mint)
我正在尝试安装这个插件：https://github.com/CatxFish/obs-v4l2sink
我遵循了所有步骤（安装了 QT，获得了 obs-studio 源代码，然后尝试构建插件）：
sudo apt install qtbase5-dev
git clone --recursive https://github.com/obsproject/obs-studio.git
git clone https://github.com/CatxFish/obs-v4l2sink.git
cd obs-v4l2sink
mkdir build && cd build
cmake -DLIBOBS_INCLUDE_DIR="../../obs-studio/libobs" -DCMAKE_INSTALL_PREFIX=/usr ..
但是后来……
-- Configuring done
CMake Error in CMakeLists.txt:
No known features for CXX compiler
""
version .
-- Build files have been written to: /home/********/obs-v4l2sink/build
我是第一次使用cmake（而不是make）编译，对编译了解不多。我在安装 cmake 和尝试编译插件之间是否遗漏了任何步骤？
根据我在网上找到的内容，这是我所做的：
build-essential 已经安装；c++、cc 也全部安装；- 尝试将
-DCMAKE_CXX_COMPILER=/usr/bin/cc 添加到 cmake 命令行（对 c++ 也是如此）；
当然，我已经完成了 update && upgrade
这是 CMakeError.log 文件中的内容：
Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler: /usr/bin/cc
Build flags:
Id flags:
The output was:
1
/usr/bin/ld : ne peut pas trouver Scrt1.o : Aucun fichier ou dossier de ce type
/usr/bin/ld : ne peut pas trouver crti.o : Aucun fichier ou dossier de ce type
collect2: error: ld returned 1 exit status
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Determining if the C compiler works failed with the following output:
Change Dir: /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_f18b2/fast"
/usr/bin/make -f CMakeFiles/cmTC_f18b2.dir/build.make CMakeFiles/cmTC_f18b2.dir/build
make[1] : on entre dans le répertoire « /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp »
Building C object CMakeFiles/cmTC_f18b2.dir/testCCompiler.c.o
/usr/bin/cc -o CMakeFiles/cmTC_f18b2.dir/testCCompiler.c.o -c /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp/testCCompiler.c
Linking C executable cmTC_f18b2
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_f18b2.dir/link.txt --verbose=1
/usr/bin/cc CMakeFiles/cmTC_f18b2.dir/testCCompiler.c.o -o cmTC_f18b2
/usr/bin/ld : ne peut pas trouver Scrt1.o : Aucun fichier ou dossier de ce type
/usr/bin/ld : ne peut pas trouver crti.o : Aucun fichier ou dossier de ce type
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_f18b2.dir/build.make:97: recipe for target 'cmTC_f18b2' failed
make[1]: *** [cmTC_f18b2] Error 1
make[1] : on quitte le répertoire « /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp »
Makefile:126: recipe for target 'cmTC_f18b2/fast' failed
make: *** [cmTC_f18b2/fast] Error 2
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Checking whether the CXX compiler is IAR using "" did not match "IAR .+ Compiler":
c++: fatal error: no input files
compilation terminated.
Checking whether the CXX compiler is IAR using "" did not match "IAR .+ Compiler":
c++: fatal error: no input files
compilation terminated.
将我的评论变成答案：
错误消息很奇怪。看起来 CMake 之前检测到 C++ 编译器，并且正在为它搜索编译器功能。但是，现在找不到那个编译器（编译器名称和版本为空）：
CMake Error in CMakeLists.txt:
No known features for CXX compiler
""
version .
这表明 CMake 配置过时，清理它可能会有用。尝试完全删除 build 文件夹，并从教程中再次 运行 CMake 步骤（从创建 build 文件夹开始，如下所示）。这将有助于清除 old/cached CMake 设置：
mkdir build && cd build
cmake -DLIBOBS_INCLUDE_DIR="../../obs-studio/libobs" -DCMAKE_INSTALL_PREFIX=/usr ..
make -j4
sudo make install
我正在分享我的问题。
我一申请就收到了同样的消息快速入门：使用 CMake 构建
.
问题是 project 命令指定了 LANGUAGES 个元素。
project(my-project C)
我删除了 C 部分，现在可以使用了。
project(my-project)
指定两种语言似乎可行。
project(my-project LANGUAGES C CXX)
我正在尝试安装这个插件：https://github.com/CatxFish/obs-v4l2sink
我遵循了所有步骤（安装了 QT，获得了 obs-studio 源代码，然后尝试构建插件）：
sudo apt install qtbase5-dev
git clone --recursive https://github.com/obsproject/obs-studio.git
git clone https://github.com/CatxFish/obs-v4l2sink.git
cd obs-v4l2sink
mkdir build && cd build
cmake -DLIBOBS_INCLUDE_DIR="../../obs-studio/libobs" -DCMAKE_INSTALL_PREFIX=/usr ..
但是后来……
-- Configuring done
CMake Error in CMakeLists.txt:
No known features for CXX compiler
""
version .
-- Build files have been written to: /home/********/obs-v4l2sink/build
我是第一次使用cmake（而不是make）编译，对编译了解不多。我在安装 cmake 和尝试编译插件之间是否遗漏了任何步骤？
根据我在网上找到的内容，这是我所做的：
build-essential已经安装；c++、cc也全部安装；- 尝试将
-DCMAKE_CXX_COMPILER=/usr/bin/cc添加到cmake命令行（对 c++ 也是如此）；
当然，我已经完成了 update && upgrade
这是 CMakeError.log 文件中的内容：
Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler: /usr/bin/cc
Build flags:
Id flags:
The output was:
1
/usr/bin/ld : ne peut pas trouver Scrt1.o : Aucun fichier ou dossier de ce type
/usr/bin/ld : ne peut pas trouver crti.o : Aucun fichier ou dossier de ce type
collect2: error: ld returned 1 exit status
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Determining if the C compiler works failed with the following output:
Change Dir: /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_f18b2/fast"
/usr/bin/make -f CMakeFiles/cmTC_f18b2.dir/build.make CMakeFiles/cmTC_f18b2.dir/build
make[1] : on entre dans le répertoire « /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp »
Building C object CMakeFiles/cmTC_f18b2.dir/testCCompiler.c.o
/usr/bin/cc -o CMakeFiles/cmTC_f18b2.dir/testCCompiler.c.o -c /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp/testCCompiler.c
Linking C executable cmTC_f18b2
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_f18b2.dir/link.txt --verbose=1
/usr/bin/cc CMakeFiles/cmTC_f18b2.dir/testCCompiler.c.o -o cmTC_f18b2
/usr/bin/ld : ne peut pas trouver Scrt1.o : Aucun fichier ou dossier de ce type
/usr/bin/ld : ne peut pas trouver crti.o : Aucun fichier ou dossier de ce type
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_f18b2.dir/build.make:97: recipe for target 'cmTC_f18b2' failed
make[1]: *** [cmTC_f18b2] Error 1
make[1] : on quitte le répertoire « /home/***********/obs-v4l2sink/build/CMakeFiles/CMakeTmp »
Makefile:126: recipe for target 'cmTC_f18b2/fast' failed
make: *** [cmTC_f18b2/fast] Error 2
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags:
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: -c
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --c++
The output was:
No such file or directory
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: CMAKE_CXX_COMPILER-NOTFOUND
Build flags:
Id flags: --ec++
The output was:
No such file or directory
Checking whether the CXX compiler is IAR using "" did not match "IAR .+ Compiler":
c++: fatal error: no input files
compilation terminated.
Checking whether the CXX compiler is IAR using "" did not match "IAR .+ Compiler":
c++: fatal error: no input files
compilation terminated.
将我的评论变成答案：
错误消息很奇怪。看起来 CMake 之前检测到 C++ 编译器，并且正在为它搜索编译器功能。但是，现在找不到那个编译器（编译器名称和版本为空）：
CMake Error in CMakeLists.txt: No known features for CXX compiler "" version .
这表明 CMake 配置过时，清理它可能会有用。尝试完全删除 build 文件夹，并从教程中再次 运行 CMake 步骤（从创建 build 文件夹开始，如下所示）。这将有助于清除 old/cached CMake 设置：
mkdir build && cd build
cmake -DLIBOBS_INCLUDE_DIR="../../obs-studio/libobs" -DCMAKE_INSTALL_PREFIX=/usr ..
make -j4
sudo make install
我正在分享我的问题。
我一申请就收到了同样的消息快速入门：使用 CMake 构建 .
问题是 project 命令指定了 LANGUAGES 个元素。
project(my-project C)
我删除了 C 部分，现在可以使用了。
project(my-project)
指定两种语言似乎可行。
project(my-project LANGUAGES C CXX)