[LLVMdev] include's are not being located

[Joseph]

> On Fri, Jun 13, 2014 at 06:06:24PM -0500, Joseph Morgan wrote:
>> In other words what does " put '--std=c++11' in the CXXFLAGS” mean?
> 
> Just for reference, the option is -std=c++11, single hyphen.
> 
> Joerg

^^ As for the build of LLVM/Clang, I rebuilt with single hyphen as follows :
/Users/josephmorgan/llvm/configure --enable-targets=x86,x86_64 CXX=`which clang++` CXXFLAGS="-std=c++11"



And now for the tutorial, somewhere along the line I have used two versions of the following when compiling the tutorial file:

clang++ -g -O3 toy.cpp `llvm-config --cxxflags --ldflags --libs core` -o toy <—this is from http://llvm.org/docs/tutorial/LangImpl3.html see results below:

Undefined symbols for architecture x86_64:
  "_del_curterm", referenced from:
      terminalHasColors(int) in libLLVMSupport.a(Process.o)
  "_set_curterm", referenced from:
      terminalHasColors(int) in libLLVMSupport.a(Process.o)
  "_setupterm", referenced from:
      terminalHasColors(int) in libLLVMSupport.a(Process.o)
  "_tigetnum", referenced from:
      terminalHasColors(int) in libLLVMSupport.a(Process.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)



clang++ -g -O3 toy.cpp `llvm-config --cppflags --ldflags --libs core` -o toy <—not sure where in this thread I picked this up but see results below:

In file included from toy.cpp:2:
In file included from /usr/local/include/llvm/IR/DerivedTypes.h:21:
In file included from /usr/local/include/llvm/IR/Type.h:19:
In file included from /usr/local/include/llvm/ADT/APFloat.h:20:
In file included from /usr/local/include/llvm/ADT/APInt.h:19:
In file included from /usr/local/include/llvm/ADT/ArrayRef.h:14:
/usr/local/include/llvm/ADT/SmallVector.h:232:20: warning: rvalue references are
      a C++11 extension [-Wc++11-extensions]
  void push_back(T &&Elt) {

…….Several other errors/warnings

fatal error: too many errors emitted, stopping now [-ferror-limit=]
72 warnings and 20 errors generated.




I appreciate your help!

Joseph Morgan


On Jun 16, 2014, at 2:35 PM, Jonathan Roelofs <jonathan at codesourcery.com> wrote:

> 
> 
> On 6/16/14, 1:14 PM, Dan Liew wrote:
>> Hi Joseph,
>> 
>>> In other words what does " put '--std=c++11' in the CXXFLAGS” mean? Do you
>>> have an example of what it would look like? or what should I read in order
>>> to learn this? I’m happy to read up but I don’t know where to start reading
>>> (besides the getting started page on llvm)   :)
>> 
>> You're still trying to build the tutorial right? I assume you
>> successfully built LLVM already. So if you're building the tutorial
>> you probably just need this.
>> 
>> clang++ -g -O3 toy.cpp `llvm-config --cxxflags --ldflags --libs core` -o toy
>> 
>> I see your `llvm-config --cxxflags`` output already has --std=c++11
>> already in it (your --cppflags does not. I'm not sure why).
> Dan, the preprocessor shouldn't need to know about '--std=c++11' right?
> 
> Maybe the confusion here is over which one of '--cppflags' vs '--cxxflags' to use where (the former is for the preprocessor, the latter is for the c++ compiler).
> 
> 
> Also, looking at an example from earlier in the thread:
> 
> ```
> clang++ -g -O3 toy.cpp
> `/Users/josephmorgan/build/Release+Assert/bin/llvm-config --cppflags
> --ldflags --libs core` -o toy
> ```
> 
> This suspiciously looks like you're using the just-built llvm-config to give parameters to the system installed clang++. IOW, this could lead you into trouble if `which clang++` doesn't point you to the one in /Users/josephmorgan/build/Release+Assert/bin/ (this really depends on what's on your PATH).
> 
>> 
>> I think Jonanthan may have confused you because his suggestion of
>> 
>> ../llvm/configure CXX=`which clang++` CXXFLAGS="--std=c++11"
>> 
>> is for configuring and building LLVM/Clang which you've already done.
> Yes, this suggestion is for configuring/building clang... sorry if that added to the confusion.
>> So you shouldn't need to do that again.
>> 
>> Thanks,
>> 
> 
> Cheers,
> Jon
> 
> -- 
> Jon Roelofs
> jonathan at codesourcery.com
> CodeSourcery / Mentor Embedded

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