使用CMake查找用CLang编译的Boost

我在Windows上使用ruenvb的CLang构建编译了Boost 1.51.0。实际上，我使用MinGW:编译了b2

bootstrap mingw
... compiling b2 using mingw...

然后我用CLang:编译了库

b2 toolset=clang stage --stagedir=. --build-type=complete --with-regex ...

顺便说一句，即使我指定了--build-type=complete，lib目录中也没有DLL，但我在某个地方读到CLang在Windows上的链接仍然有问题，这可能是原因。不管怎样，静态库对我来说很好。我在%BOOST_ROOT%lib:中得到了这些文件

libboost_regex-clang31-1_51.lib
libboost_regex-clang31-d-1_51.lib
libboost_regex-clang31-mt-1_51.lib
libboost_regex-clang31-mt-d-1_51.lib
libboost_regex-clang31-mt-s-1_51.lib
libboost_regex-clang31-mt-sd-1_51.lib
libboost_regex-clang31-s-1_51.lib
libboost_regex-clang31-sd-1_51.lib

现在，如果我从命令行用CLang编译一些东西，一切都会正常工作。当我试图让CMake找到Boost库时，问题就显现出来了：它根本找不到它们。我尝试过这个CMakeFiles.txt：

cmake_minimum_required (VERSION 2.8)
project(ccc)
# Setting/unsetting this does not change anything.
set(Boost_USE_STATIC_LIBS ON)
find_package(Boost COMPONENTS regex REQUIRED)
include_directories(${Boost_INCLUDE_DIR})
link_directories(${Boost_LIBRARY_DIRS})
add_executable(ccc main.cpp)
target_link_libraries(ccc
${Boost_REGEX_LIBRARY}
)

使用MinGW(以及MinGW编译的Boost版本)构建它是可行的。如果我尝试使用CLang(在设置了CC=clang、CXX=clang++和BOOST_ROOT=C:/misc/boost/clang-1_51_0之后)，它不会：

D:Desktopppp>cmake -G "MinGW Makefiles" ..ccc
-- The C compiler identification is Clang 3.1.0
-- The CXX compiler identification is Clang 3.1.0
-- Check for working C compiler: C:/misc/clang/bin/clang.exe
-- Check for working C compiler: C:/misc/clang/bin/clang.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: C:/misc/clang/bin/clang++.exe
-- Check for working CXX compiler: C:/misc/clang/bin/clang++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at C:/misc/cmake/share/cmake-2.8/Modules/FindBoost.cmake:1191 (message):
Unable to find the requested Boost libraries.
Boost version: 1.51.0
Boost include path: C:/misc/boost/clang-1_51_0
The following Boost libraries could not be found:
boost_regex
No Boost libraries were found.  You may need to set BOOST_LIBRARYDIR to the
directory containing Boost libraries or BOOST_ROOT to the location of
Boost.
Call Stack (most recent call first):
CMakeLists.txt:5 (find_package)

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
Boost_REGEX_LIBRARY (ADVANCED)
linked by target "ccc" in directory D:/Desktop/ccc
-- Configuring incomplete, errors occurred!

然而，如果我手动编译，它会再次工作：

clang++ main.cpp -I%BOOST_ROOT% -L%BOOST_ROOT%lib -llibboost_regex-clang31-1_51
...Ok, and the executable works

手动设置BOOST_LIBRARYDIR也不起作用。使用反斜杠也不行。