llvm dev - Jul 2015 - [LLVMdev] Link error when I compile the Toy(kaleidoscope) example

Hi All,


I check out the LLVM code and compile, install it by below
commands:
>mkdir build & cd build
>cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release ../
>make -j4
>make install

Then I copy the source code from http://llvm.org/docs/tutorial/LangImpl3.html
And run the command as it showed:
# Compile clang++ -g -O3 toy.cpp `llvm-config --cxxflags --ldflags --system-libs
--libs core` -o toy # Run ./toy
Then I got the follow error:
-------------------------------------------------------------------------------------------------------------
clang version 3.7.0 (trunk 241442)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/usr/local/bin/clang-3.7" -cc1 -triple x86_64-unknown-linux-gnu
-emit-obj -disable-free -disable-llvm-verifier -main-file-name toy.cpp
-mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno
-masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu
x86-64 -momit-leaf-frame-pointer -v -dwarf-column-info -ffunction-sections
-fdata-sections -resource-dir /usr/local/bin/../lib/clang/3.7.0 -D NDEBUG -D
_GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D
__STDC_LIMIT_MACROS -I /usr/local/include -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8 -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/local/bin/../lib/clang/3.7.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O3 -Wall -W -Wno-unused-parameter
-Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -Wno-long-long
-Wno-maybe-uninitialized -Wno-comment -pedantic -std=c++11 -fdeprecated-macro
-fdebug-compilation-dir /home/mingliang/workspace/learning/llvm/kaleidoscope
-ferror-limit 19 -fmessage-length 239 -fvisibility-inlines-hidden -mstackrealign
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option
-fcolor-diagnostics -vectorize-loops -vectorize-slp -o /tmp/toy-4d46c9.o -x c++
toy.cpp
warning: unknown warning option '-Wno-maybe-uninitialized'; did you mean
'-Wno-uninitialized'? [-Wunknown-warning-option]
clang -cc1 version 3.7.0 based upon LLVM 3.7.0svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
ignoring duplicate directory
"/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8"
ignoring duplicate directory "/usr/local/include"
  as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8
 /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/x86_64-linux-gnu/c++/4.8
 /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/backward
 /usr/local/include
 /usr/local/bin/../lib/clang/3.7.0/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
1 warning generated.
 "/usr/bin/ld" -z relro --hash-style=gnu --build-id --eh-frame-hdr -m
elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o toy
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.8/crtbegin.o -L/usr/local/lib
-L/usr/lib/gcc/x86_64-linux-gnu/4.8
-L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../.. -L/usr/local/bin/../lib -L/lib
-L/usr/lib /tmp/toy-4d46c9.o -lLLVMCore -lLLVMSupport -lrt -ldl -ltinfo
-lpthread -lm -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-linux-gnu/4.8/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crtn.o
/tmp/toy-4d46c9.o:(.data.rel.ro._ZTIN4llvm8FCmpInstE[_ZTIN4llvm8FCmpInstE]+0x10):
undefined reference to `typeinfo for llvm::CmpInst'
clang-3.7: error: linker command failed with exit code 1 (use -v to see
invocation)





Could you please help solve this issue?


Thanks.
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> undefined reference to `typeinfo for llvm::CmpInst'
> clang-3.7: error: linker command failed with exit code 1 (use -v to see
> invocation)
Looks like an error from the toy being built with -frtti but LLVM with
-fno-rtti. Try this if you're not actually using the typeinfo:

$ clang++ -g -O3 toy.cpp `llvm-config --cxxflags --ldflags
--system-libs --libs core` -fno-rtti -o toy

I've never been quite sure why that flag isn't part of "llvm-config
--cxxflags".

Tim.