[LLVMdev] include's are not being located

[Joseph]

On Jun 14, 2014, at 11:59 AM, Jonathan Roelofs <jonathan at codesourcery.com> wrote:

> 
> 
> On 6/13/14, 5:06 PM, Joseph Morgan wrote:
>> 
>> On Jun 12, 2014, at 4:37 PM, Jonathan Roelofs <jonathan at codesourcery.com
>> <mailto:jonathan at codesourcery.com>> wrote:
>> 
>>> 
>>> 
>>> On 6/12/14, 3:07 PM, Joseph wrote:
>>>> Hi Dan,
>>>> 
>>>> 
>>>> So now that the includes are being found building the tutorial results in 74
>>>> warnings and 20 errors. Heres a couple examples:
>>>> 
>>>> 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) {
>>>>                   ^
>>>> /usr/local/include/llvm/ADT/SmallVector.h:476:33: warning: rvalue references
>>>> are a C++11 extension [-Wc++11-extensions]
>>>>  iterator insert(iterator I, T &&Elt) {
>>>> 
>>> You need to build Clang/LLVM with a {CXX, CXXFLAGS} pair (read: a c++ compiler
>>> for your host) that supports C++11. That can either be one whose default is
>>> c++11, or one that doesn't but lets you put '--std=c++11' in the CXXFLAGS.
>>> 
>>> http://llvm.org/docs/GettingStarted.html suggests GCC >= 4.7.0 for this.
>> 
>> Hello again,
>> 
>> Running gcc —version gets me the following results:
>> 
>> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
>> --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/c++/4.2.1
>> Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
>> 
>> So it looks like I do not have proper GCC installed, I figured that Xcode would
>> have gcc included.
> These days, Xcode ships with Clang (which is a drop-in replacement for GCC, based on LLVM). This should be fine for building TOT Clang/LLVM from source, as long as it is new enough (and I *think* it is).
>> 
>> I can see that I am in over my head because I do not know what CXX, CXXFLAGS are
>> and where do you apply them? In make?
> These are just canonical names for set of flags you pass to a build system (see: http://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html#Implicit-Variables for more examples).
> 
> The idea is that you would set the ones that you need when configuring (where the default doesn't quite make sense for your platform)... so I think in your case, you'd want something like this:
> 
> ../llvm/configure CXX=`which clang++` CXXFLAGS="--std=c++11”


Thanks Jon for your advice. I am still getting the same errors. When I check the cxxflags here’s the output:

Josephs-iMac:~ josephmorgan$ /Users/josephmorgan/build/Debug+Asserts/bin/llvm-config —cxxflags
-I/Users/josephmorgan/llvm/include -I/Users/josephmorgan/build/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -g -std=c++11 -fvisibility-inlines-hidden -fno-exceptions -fno-rtti -fno-common -Woverloaded-virtual -Wcast-qual


Josephs-iMac:~ josephmorgan$ /Users/josephmorgan/build/Debug+Asserts/bin/llvm-config --cppflags
-I/Users/josephmorgan/llvm/include -I/Users/josephmorgan/build/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS


Josephs-iMac:~ josephmorgan$  /Users/josephmorgan/build/Debug+Asserts/bin/llvm-config --cflags
-I/Users/josephmorgan/llvm/include -I/Users/josephmorgan/build/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -g -fno-common

Does that look correct in your opinion?

Thanks again!
Joseph


> 
> Cheers,
> 
> Jon
>> 
>> 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)   :)
>> 
>> Thank you for your suggestions!
>> Joseph Morgan
>> 
>> 
> 
> -- 
> Jon Roelofs
> jonathan at codesourcery.com
> CodeSourcery / Mentor Embedded

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