清除cmake构建输出:

命令行:

$ rm -rf [folder that you builded the project]/
$ cmake --build .

Cmake:

cmake --build . --target clean

cmake主要生成一个Makefile文件，可以将rm添加到干净的PHONY文件中。

例如,

[root@localhost hello]# ls
CMakeCache.txt  CMakeFiles  cmake_install.cmake  CMakeLists.txt  hello  Makefile  test
[root@localhost hello]# vi Makefile
clean:
        $(MAKE) -f CMakeFiles/Makefile2 clean
        rm   -rf   *.o   *~   .depend   .*.cmd   *.mod    *.ko   *.mod.c   .tmp_versions *.symvers *.d *.markers *.order   CMakeFiles  cmake_install.cmake  CMakeCache.txt  Makefile

从CMake 3.24开始，存在——fresh命令行选项，每次重新构建整个构建树:

——新鲜 3.24新版功能。 执行构建树的新配置。这将删除任何 现有的CMakeCache.txt文件和关联的CMakeFiles/目录 从头开始重新创建。

https://cmake.org/cmake/help/latest/manual/cmake.1.html#options

CMake官方常见问题解答说明:

Some build trees created with GNU autotools have a "make distclean" target that cleans the build and also removes Makefiles and other parts of the generated build system. CMake does not generate a "make distclean" target because CMakeLists.txt files can run scripts and arbitrary commands; CMake has no way of tracking exactly which files are generated as part of running CMake. Providing a distclean target would give users the false impression that it would work as expected. (CMake does generate a "make clean" target to remove files generated by the compiler and linker.) A "make distclean" target is only necessary if the user performs an in-source build. CMake supports in-source builds, but we strongly encourage users to adopt the notion of an out-of-source build. Using a build tree that is separate from the source tree will prevent CMake from generating any files in the source tree. Because CMake does not change the source tree, there is no need for a distclean target. One can start a fresh build by deleting the build tree or creating a separate build tree.

如果您有自定义定义，并希望在清理之前保存它们，请在构建目录中运行以下命令:

sed -ne '/variable specified on the command line/{n;s/.*/-D \0 \\/;p}' CMakeCache.txt

然后创建一个新的构建目录(或删除旧的构建目录并重新创建它)，最后使用上面脚本获得的参数运行cmake。

我用zsxwing的答案成功解决了以下问题:

我有在多个主机上构建的源代码(在Raspberry Pi Linux板上，在VMware Linux虚拟机上，等等)。

我有一个Bash脚本，根据机器的主机名创建临时目录，就像这样:

# Get hostname to use as part of directory names
HOST_NAME=`uname -n`

# Create a temporary directory for cmake files so they don't
# end up all mixed up with the source.

TMP_DIR="cmake.tmp.$HOSTNAME"

if [ ! -e $TMP_DIR ] ; then
  echo "Creating directory for cmake tmp files : $TMP_DIR"
  mkdir $TMP_DIR
else
  echo "Reusing cmake tmp dir : $TMP_DIR"
fi

# Create makefiles with CMake
#
# Note: switch to the temporary dir and build parent 
#       which is a way of making cmake tmp files stay
#       out of the way.
#
# Note 2: to clean up cmake files, it is OK to
#        "rm -rf" the temporary directories

echo
echo Creating Makefiles with cmake ...

cd $TMP_DIR

cmake ..

# Run makefile (in temporary directory)

echo
echo Starting build ...

make