[LLVMbugs] [Bug 21674] New: Stand-alone compilation fails, due to std=c++11 flag missing.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21674

            Bug ID: 21674
           Summary: Stand-alone compilation fails, due to std=c++11 flag
                    missing.
           Product: libc++abi
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hannes_weisbach at gmx.net
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

I tried to do a "stand alone" compilation of libcxxabi according to
http://libcxxabi.llvm.org:

svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi (rev 222832)
mkdir build
cd build
cmake -DLIBCXXABI_LIBCXX_INCLUDES=path/to/libcxx/include ..
DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
-- The C compiler identification is Clang 3.5.0
-- The CXX compiler identification is Clang 3.5.0
[...]

make
Scanning dependencies of target cxxabi
[  5%] Building CXX object src/CMakeFiles/cxxabi.dir/abort_message.cpp.o
[ 11%] Building CXX object src/CMakeFiles/cxxabi.dir/cxa_aux_runtime.cpp.o
[ 17%] Building CXX object src/CMakeFiles/cxxabi.dir/cxa_default_handlers.cpp.o
In file included from
/home/hannesweisbach/libcxxabi/src/cxa_default_handlers.cpp:19:
In file included from /home/hannesweisbach/libcxxabi/src/cxa_exception.hpp:19:
/home/hannesweisbach/libcxxabi/include/unwind.h:44:27: warning: commas at the
end of enumerator lists are a C++11 extension [-Wc++11-extensions]
  _URC_CONTINUE_UNWIND = 8,
                          ^
1 warning generated.
[ 23%] Building CXX object src/CMakeFiles/cxxabi.dir/cxa_demangle.cpp.o
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:10:33: warning: variadic
macros are a C99 feature [-Wvariadic-macros]
#define _LIBCPP_EXTERN_TEMPLATE(...)
                                ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:60:10: warning: 'auto' type
specifier is a C++11 extension [-Wc++11-extensions]
    for (auto& s : db.names)
         ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:60:18: warning: range-based
for loop is a C++11 extension [-Wc++11-extensions]
    for (auto& s : db.names)
                 ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:64:10: warning: 'auto' type
specifier is a C++11 extension [-Wc++11-extensions]
    for (auto& v : db.subs)
         ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:64:18: warning: range-based
for loop is a C++11 extension [-Wc++11-extensions]
    for (auto& v : db.subs)
                 ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:70:14: warning: 'auto' type
specifier is a C++11 extension [-Wc++11-extensions]
        for (auto& s : v)
             ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:70:22: warning: range-based
for loop is a C++11 extension [-Wc++11-extensions]
        for (auto& s : v)
                     ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:76:10: warning: 'auto' type
specifier is a C++11 extension [-Wc++11-extensions]
    for (auto& t : db.template_param)
         ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:76:18: warning: range-based
for loop is a C++11 extension [-Wc++11-extensions]
    for (auto& t : db.template_param)
                 ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:80:14: warning: 'auto' type
specifier is a C++11 extension [-Wc++11-extensions]
        for (auto& v : t)
             ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:80:22: warning: range-based
for loop is a C++11 extension [-Wc++11-extensions]
        for (auto& v : t)
                     ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:86:18: warning: 'auto' type
specifier is a C++11 extension [-Wc++11-extensions]
            for (auto& s : v)
                 ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:86:26: warning: range-based
for loop is a C++11 extension [-Wc++11-extensions]
            for (auto& s : v)
                         ^
/home/hannesweisbach/libcxxabi/src/cxa_demangle.cpp:141:12: error: unknown type
name 'constexpr'
    static constexpr const char* spec = "%af";
           ^
[...]

When adding the flag "-std=c++11" manually everything works fine:
rm -rf *
cmake -DCMAKE_CXX_FLAGS="-std=c++11"
-DLIBCXXABI_LIBCXX_INCLUDES=../../libcxx/include .. -DCMAKE_C_COMPILER=clang
-DCMAKE_CXX_COMPILER=clang++
-- The C compiler identification is Clang 3.5.0
-- The CXX compiler identification is Clang 3.5.0
[...]
make
[Usual output. *No errors, no warnings*]

Hope this helps.

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