Using LLVM Libraries in C++ Project

Question

I'm currently having problem with simple project(or llvm-example for that matter). My assignment requires me to use llvm libraries, however this isn't as easy as I had hoped.

I've build LLVM using MinGW GCC and CMake. After build I can compile with clang fine. However if I create simple hello world type of program

#include "llvm-c/Core.h"

int main(int argc, char**argv)
{
  return 0;
}

and try to compile it with

clang++ main.cpp

I get

In file included from main.cpp:1:
./llvm-c/Core.h:18:10: fatal error: 'llvm-c/ErrorHandling.h' file not found
#include "llvm-c/ErrorHandling.h"

For this example I have copied contents of include directory into directory with main.cpp. After getting this issue I tried to inspect those headers and all of them have position llvm/ or llvm-c/, instead of pure relative address. I figured these libs were used to build/make llvm and libs for me to use are actually in build directory, which is where I have built llvm, but include directory in build has only about 1/2 *.h files.

I can't seem to find anything in documentation related to this and even basic llvm examples are expecting to include libs in format like llvm/Core.h

EDIT

After solving inclusion problem, now I get several other problems which seems to be linked to mingw.

This is how new program looks.

#define __STDC_LIMIT_MACROS
#define __STDC_CONSTANT_MACROS

#include <llvm-c/Core.h>

using namespace std;

int main()
{
    LLVMModuleRef rff =  LLVMModuleCreateWithName("testname");
    return 0;
}

this generates

d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(CommandLine.cpp.obj):CommandLine.cpp|| undefined reference to `__mingw_strtod'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(regerror.c.obj):regerror.c|| undefined reference to `__ms_vsnprintf'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `SHGetKnownFolderPath@16'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `_imp__CoTaskMemFree@4'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `_imp___chsize_s'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_Profile'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_Profile'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_Profile'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_Profile'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(Path.cpp.obj):Path.cpp|| undefined reference to `FOLDERID_LocalAppData'|
d:\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.9.3\..\..\..\libLLVMSupport.a(TimeValue.cpp.obj):TimeValue.cpp|| undefined reference to `_localtime32'|

I used llvm-config --libs core for linker additions.

Tried commands:

g++ main.cpp -lLLVMCore -lLLVMSupport
clang++ main.cpp -lLLVMCore -lLLVMSupport

"For this example I have copied contents of include directory into directory with main.cpp" - Do you mean that "fixed" your issue? — wvoquine
– wvoquine, Commented Mar 21, 2016 at 9:03
In build system you should provide the include path with the llvm/include directory and library path with the directory in build where you have your library binaries... presumably build/lib — wvoquine
– wvoquine, Commented Mar 21, 2016 at 9:05
No it didnt. It wont compile at this point, because libs are included with their folders in path(which makes final path something like llvm-c/llvm-c/Core.h I figured that maybe removing folder from each instance of #include would help, but its too much files and I dont think this is right approach. — DFDark
– DFDark, Commented Mar 22, 2016 at 0:17
As for paths, llvm libs that have been build are in PATH so there shouldn't be this problem, and static link problem would pop different error. I did try to add include path to compilation -I"path/to/include", but this case builds first *.h and fails at the second one (one inside that header) — DFDark
– DFDark, Commented Mar 22, 2016 at 0:19
"and even basic llvm examples are expecting to include libs in format like llvm/Core.h" - so do you mean that the only problem remains is about that quoted sentence? Where do you get those examples? — wvoquine
– wvoquine, Commented Mar 22, 2016 at 5:24

Industrial-antidepressant · Accepted Answer · 2016-10-16 14:06:30Z

3

Those are WinAPI references. The easiest way is to find those are google for documentation for it or go to the mingw library directory ( ..\mingw530_32\i686-w64-mingw32\lib\ ) and find in files.

So

FOLDERID_LocalAppData is defined in libuuid.a so use the -luuid compile parameter
_imp__CoTaskMemFree@4 is defined in libole32.a so use the -lole32 compile parameter

For me g++ -std=c++11 -ID:\Devel\install\include main.cc -LD:\Devel\install\lib -lLLVMCore -lLLVMSupport -luuid -lole32

is working as I installed the llvm to D:\Devel\install

answered Oct 16, 2016 at 14:06

Industrial-antidepressant

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wvoquine · Accepted Answer · 2016-03-22 09:55:07Z

0

If you need the headers from your-llvm/include directory instead of copying the contents of the include directory you should just specify the include path to your-llvm/include with -I option or whatever the build system requires.

answered Mar 22, 2016 at 9:55

wvoquine

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2 Comments

DFDark Over a year ago

Already tried that, before posting this question. clang++ main.cpp -I"D:\llvm\include" here is command I used. And this is result:

In file included from D:\llvm\include/llvm-c/ErrorHandling.h:17:0,                  from D:\llvm\include/llvm-c/Core.h:18,                  from main.cpp:1: D:\llvm\include/llvm-c/Types.h:17:36: fatal error: llvm/Support/DataTypes.h: No such file or directory  #include "llvm/Support/DataTypes.h"                                     ^ compilation terminated.

DFDark Over a year ago

I have finally got this working, its mostly that, however what was needed to be done is to add not only include directory of llvm/include but also llvm/build/include. Build seems to have generated few libs on its own. Now its just pops "undefined referce to ..." errors which I will add to main question.

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