On Linux I see this:
llvm[2]: Linking Debug executable c-index-test
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::CFG::buildCFG(clang::Stmt*, clang::ASTContext*)'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::UnqualifiedId::clear()'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::DeclSpec::SetStorageClassSpec(clang::DeclSpec::SCS,
clang::SourceLocation, char const*&, unsigned int&)'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::Action::~Action()'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::DeclaratorChunk::getFunction(bool, bool,
clang::SourceLocation, clang::DeclaratorChunk::ParamInfo*, unsigned
int, unsigned int, bool, clang::SourceLocation, bool, void**,
clang::SourceRange*, unsigned int, clang::SourceLocation,
clang::SourceLocation, clang::Declarator&)'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::CFG::~CFG()'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::AttributeList::~AttributeList()'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::UnqualifiedId::setOperatorFunctionId(clang::SourceLocation,
clang::OverloadedOperatorKind, clang::SourceLocation*)'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to `vtable
for clang::Action'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::AttributeList::getKind(clang::IdentifierInfo const*)'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to `vtable
for clang::ActionBase'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::DeclSpec::SetTypeSpecType(clang::DeclSpec::TST,
clang::SourceLocation, char const*&, unsigned int&, void*, bool)'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::DeclSpec::getParsedSpecifiers() const'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to `vtable
for clang::PrettyStackTraceActionsDecl'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::DeclSpec::isMissingDeclaratorOk()'
/home/xzx/llvm/Debug/lib/libCIndex.so: undefined reference to
`clang::DeclSpec::getSpecifierName(clang::DeclSpec::TST)'
collect2: ld returned 1 exit status
make[2]: *** [/home/xzx/llvm/Debug/bin/c-index-test] 错误 1
make[2]:正在离开目录 `/home/xzx/llvm/tools/clang/tools/c-index-test'
make[1]: *** [all] 错误 1
make[1]:正在离开目录 `/home/xzx/llvm/tools/clang/tools'
make: *** [all] 错误 1