[cfe-dev] can't link with libLLVMSupport.a

[Anton Smirnov]

Oops. i've tried again and it helps!

Actually i can't understand why -fno-rtti is not appended by
`../llvm_34_local_installed2/bin/llvm-config --cxxflags` but it's needed in
my case.
Thanks, James.

2014-09-15 11:37 GMT+06:00 Anton Smirnov <dev at antonsmirnov.name>:

> Hi, James.
>
> Thanks for suggestion.
>
> I've modified compile/link cmd and added -fno-rtti (clang++ -c
> ./exe_interpreter.cpp -o ./exe_interpreter2.o -fno-rtti) but no luck.
> How can i analyze produced object file to make sure it contains all
> necessary information (rtti)?
>
> Let me explain everything in brief.
> I've copied lli tool source code and modified it a bit (renamed main())
>  to produce static library instead of executable. I'm able to compile it
> and link it so lib..a file. Then i'm trying to link it with LLVM libs and
> unfortunately StringSaver class code is not found in libLLVMSupport.a
> though i can see it contains according object file.
>
> I can modify my lib and executable compile/link arguments as needed, so
> please suggest me what can be done as i'm in stuck.
>
> Regards, Anton.
>
>
> 2014-09-15 7:14 GMT+06:00 James Dennett <james.dennett at gmail.com>:
>
>> You might try building your library with -fno-rtti, or clang without it.
>>
>> -- James
>> On Sep 14, 2014 9:29 AM, "Anton Smirnov" <dev at antonsmirnov.name> wrote:
>>
>>> Hi.
>>>
>>> I'm trying to compile reduced clang "driver.cpp" - added printf for
>>> arguments - and i'm getting linking with libLLVMSupport.a error - no
>>> StringSaver class found.
>>>
>>> # lib
>>> echo "compiling cmd builder (x86_64) ..."
>>> clang++ `../llvm_34_local_installed2/bin/llvm-config --cxxflags` -I
>>> ../llvm_34/tools/clang/include -I
>>> ../llvm_34_build_local2/tools/clang/include  -c ./lib_cmd_builder.cpp -o
>>> ./lib_cmd_builder_x86_64.o
>>>
>>> echo "linking cmd builder (x86_64) ..."
>>> CMD="clang++ `../llvm_34_local_installed2/bin/llvm-config --ldflags`
>>> ./lib_cmd_builder_x86_64.o -o exe_cmd_builder_x86_64
>>> `../llvm_34_local_installed2/bin/llvm-config --libs` -lclangARCMigrate
>>> -lclangAST -lclangASTMatchers -lclangAnalysis -lclangApplyReplacements
>>> -lclangBasic -lclangCodeGen -lclangDriver -lclangDynamicASTMatchers
>>> -lclangEdit -lclangFormat -lclangFrontend -lclangFrontendTool -lclangIndex
>>> -lclangLex -lclangParse -lclangQuery -lclangRewriteCore
>>> -lclangRewriteFrontend -lclangSema -lclangSerialization
>>> -lclangStaticAnalyzerCheckers -lclangStaticAnalyzerCore
>>> -lclangStaticAnalyzerFrontend -lclangTidy -lclangTidyGoogleModule
>>> -lclangTidyLLVMModule"
>>>
>>> Error message:
>>>
>>> Undefined symbols for architecture x86_64:
>>>
>>>   "typeinfo for llvm::cl::StringSaver", referenced from:
>>>
>>>       typeinfo for (anonymous namespace)::StringSetSaver in
>>> lib_cmd_builder_x86_64.o
>>>
>>> ld: symbol(s) not found for architecture x86_64
>>>
>>> clang: error: linker command failed with exit code 1 (use -v to see
>>> invocation)
>>>
>>>
>>> Checking libLLVM is found and contains CommandLine object data:
>>>
>>> (found on -L path):
>>>
>>> find ../llvm_34_local_installed2/lib/ -name "*upport*"
>>>
>>> ../llvm_34_local_installed2/lib//libLLVMSupport.a
>>>
>>>
>>> (contains CommandLine.cpp object data):
>>>
>>> ar -t ../llvm_34_local_installed2/lib//libLLVMSupport.a | grep
>>> CommandLine
>>>
>>> CommandLine.cpp.o
>>>
>>>
>>> The class StringSaver is declared  in CommandLine.cpp:
>>>
>>>
>>>
>>> /Users/asmirnov/Documents/dev/src/llvm_34/include/llvm/Support/CommandLine.h
>>>
>>> class StringSaver {
>>>
>>>   virtual void anchor();
>>>
>>> public:
>>>
>>>   virtual const char *SaveString(const char *Str) = 0;
>>>
>>>   virtual ~StringSaver() {};  // Pacify -Wnon-virtual-dtor.
>>>
>>> };
>>>
>>>
>>> StringSaver inheritor is declared and implemented in self file
>>> (lib_cmd_builder.cpp):
>>>
>>> namespace {
>>>
>>>   class StringSetSaver : public llvm::cl::StringSaver {
>>>
>>>   public:
>>>
>>>     StringSetSaver(std::set<std::string> &Storage) : Storage(Storage) {}
>>>
>>>     const char *SaveString(const char *Str) LLVM_OVERRIDE {
>>>
>>>       return SaveStringInSet(Storage, Str);
>>>
>>>     }
>>>
>>>   private:
>>>
>>>     std::set<std::string> &Storage;
>>>
>>>   };
>>>
>>> }
>>>
>>>
>>> So i can't understand why i'm having this error.
>>>
>>> Any thoughts?
>>>
>>> _______________________________________________
>>> cfe-dev mailing list
>>> cfe-dev at cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>>
>>>
>
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