CMake "clang++ is not able compile a simple test program" (Fedora 20) - c++

Question

So I tried to install clang + cmake to compile a simple C++ program and I'm getting the following error:
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is Clang 3.5.0
-- 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
-- Check for working CXX compiler: /usr/local/bin/clang++
-- Check for working CXX compiler: /usr/local/bin/clang++ -- broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCXXCompiler.cmake:54 (message):
The C++ compiler "/usr/local/bin/clang++" is not able to compile a simple
test program.
It fails with the following output:
Change Dir: /home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp
Run Build Command:/usr/bin/gmake "cmTryCompileExec697180971/fast"
/usr/bin/gmake -f CMakeFiles/cmTryCompileExec697180971.dir/build.make
CMakeFiles/cmTryCompileExec697180971.dir/build
gmake[1]: Entering directory
`/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report
/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp/CMakeFiles 1
Building CXX object
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o
/usr/local/bin/clang++ -o
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o -c
/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
Linking CXX executable cmTryCompileExec697180971
/usr/bin/cmake -E cmake_link_script
CMakeFiles/cmTryCompileExec697180971.dir/link.txt --verbose=1
/usr/local/bin/clang++
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o -o
cmTryCompileExec697180971 -rdynamic
/usr/bin/ld: cannot find -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
gmake[1]: Leaving directory
`/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTryCompileExec697180971] Error 1
gmake: *** [cmTryCompileExec697180971/fast] Error 2
It's not even compiling my program because it fails to compile a test program.
Looks like the important line is here:
/usr/bin/ld: cannot find -lstdc++
However, I have checked that libstdc++ is installed and up to date, so at this point I'm quite lost.
Other things I've tried:
Using prebuilt binaries instead of sudo yum install clang
remove and reinstall
Tried clang++ hello.cpp (hello world program). It says <iostreams> is not found. Is clang missing a standard library? EDIT: changing to <iostream> gives me the same linker error above.
I'm not familiar with the clang, cmake and C++ scene in general, so I'd appreciate any pointers. Thanks!

Answer 1

You need the development libraries and headers for C++ library, try
yum install libstdc++-devel

Answer 2

Your /home/gnu/bin/c++ seem to require additional flag to link things properly and CMake doesn't know about that.
To use /usr/bin/c++ as your compiler run cmake with -DCMAKE_CXX_COMPILER=/usr/bin/c++.
Also, CMAKE_PREFIX_PATH variable sets destination dir where your project' files should be installed. It has nothing to do with CMake installation prefix and CMake itself already know this.