Cmake在使用luarocks安装fb呼机时无法识别FOLLY_LIBRARIES的缓存项

Question

我正试图在linux上安装手电筒。但是，当我试图运行luarocks install fbtorch时，我会得到以下错误。

cmake -E make_directory build && cd build && cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH="/home/user/torch/install/bin/.." -DCMAKE_INSTALL_PREFIX="/home/user/torch/install/lib/luarocks/rocks/fbtorch/scm-1"

fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Torch7 in /home/user/torch/install
CMake Error at /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
  REQUIRED_ARGS (missing: FOLLY_INCLUDE_DIR FOLLY_LIBRARIES)
Call Stack (most recent call first):
  /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindFolly.cmake:23 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:12 (FIND_PACKAGE)


-- Configuring incomplete, errors occurred!
See also "/tmp/luarocks_fbtorch-scm-1-4920/fbtorch/build/CMakeFiles/CMakeOutput.log".

现在，为了修复REQUIRED_ARGS (missing: FOLLY_INCLUDE_DIR FOLLY_LIBRARIES)，我将cmake命令更改为：

cmake -E make_directory build && cd build && cmake .. -DFOLLY_LIBRARIES="/home/user/local/lib" -DFOLLY_INCLUDE_DIR="/home/user/local/include" -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH="$(LUA_BINDIR)/.." -DCMAKE_INSTALL_PREFIX="$(PREFIX)"

请注意，我已经在适当的目录中编译并在愚昧上安装了/home/user/local/。

这修复了FOLLY_INCLUDE_DIR错误，但它仍然显示FOLLY_LIBRARIES的错误，如下所示：

CMake Error at /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
  REQUIRED_ARGS (missing: FOLLY_LIBRARIES)
Call Stack (most recent call first):
  /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindFolly.cmake:23 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:12 (FIND_PACKAGE)

我在这里错过了什么？为什么cmake识别FOLLY_INCLUDE_DIR的缓存条目，而不识别FOLLY_LIBRARIES的缓存条目？

Answer 1

find_package()调用中“遗漏”列表中列出的变量是，而不是缓存。因此，设置相同名称的缓存变量可能无法解决问题。

如果搜索包实际上安装到非标准位置，则最好是提示关于该位置的“查找”脚本，而不是盲目设置“缺失”变量。

许多“查找”脚本在代码开始时描述了参数化的可能方式。除此之外，还有一些常见的方法可以提示“查找”包的实际位置；这些方法适用于大多数脚本。例如，您可以将包的安装位置添加到CMAKE_PREFIX_PATH变量中(参见那个问题)。

Answer 2

如果你看看FindFolly.cmake，你就能看到-

SET(FOLLY_LIBRARIES ${FOLLY_LIBRARY})

这意味着正在设置FOLLY_LIBRARIES，但它需要FOLLY_LIBRARY。

因此，在命令行中，将-DFOLLY_LIBRARIES更改为-DFOLLY_LIBRARY