Build Failure with Nix: fatal error: 'typeinfo' file not found

[Nekroze]

I am working on reproducible builds for LDC and you project as well using the Nix package manager.
I have ldc working fine however I am stuck on an issue with calypso's build when it tries to compile runtime/druntime/src/ldc/eh/cpp/unwind-cxx.h:33:10 which is from what I can tell included in line one of build/runtime/calypso_cache.h. For some reason it cannot handle the following line as it throws fatal error: 'typeinfo' file not found stopping the build:

#include <typeinfo>

You can test my build environment on any platform that Nix support (linux, osx, cygwin, etc.) by cloning my nix expressions for your project with instructions Nekroze/ldc-calypso.nix and you can find the output of my build (with the middle (boring) part removed) at this gist.

[Syniurge]

typeinfo is from libstdc++, if with Nix the location of the headers has to be specified then you probably have to tweak the runtime/CMakeLists.txt file so that during the compilation of druntime, -I options get passed to the Clang instance with ldc2 -cpp-args -I/path/to/libstdc++/headers (...).

-cpp-args <Clang option> is used to pass any command-line option to Clang, and currently each option has to be preceded by -cpp-args:

  ldc2 -cpp-args -I/include1 -cpp-args -I/include2 -cpp-args --anotherc++flag (...)

[Nekroze]

I have tried adding "-DLDC_CXXFLAGS=-I${stdenv.cc.cc}/include" to the cmake flags however that does not seem to be passed down into the runtime/CMakeLists.txt from what I can tell it is only used in the CMakeLists.txt in the project root.

Could LDC_CXXFLAGS be used in runtime/CMakeLists.txt or does cmake not work like that? unless LDC_CXXFLAGS is not what this is designed for and I am reading it wrong.

It seems that its the dc_flags variable from runtime/CMakeLists.txt that I want to add that include flag too. Do I have to modify the file to accept that or can i just add "-DDC_FLAGS=-I${stdenv.cc.cc}/include" to the cmakeFlags that get called on the root CMakeLists.txt?

[Syniurge]

LDC_CXXFLAGS are the flags passed during the compilation of the ldc2 binary, not the runtime.

It seems that its the dc_flags variable from runtime/CMakeLists.txt that I want to add that include flag too. Do I have to modify the file to accept that or can i just add "-DDC_FLAGS=-I${stdenv.cc.cc}/include" to the cmakeFlags that get called on the root CMakeLists.txt?

Yes that's the one but it's not modifiable with -D. However -DRT_CFLAGS="-cpp-args -I${stdenv.cc.cc}/include" might work.

[Syniurge]

Oops RT_CFLAGS isn't modifiable either, the correct option is D_FLAGS.

[timotheecour]

@Syniurge @Nekroze
which flag should I pass in D_FLAGS ?
(I'm on OSX)
I tried:
-cpp-args=-I/Users/timothee/homebrew/Cellar/gcc/7.1.0/include/c++/7.1.0/x86_64-apple-darwin16.7.0/

also tried /Users/timothee/homebrew/Cellar/llvm@3.9/3.9.1_1/include/c++/v1/
and /Users/timothee/homebrew/Cellar/gcc/7.1.0/include/c++/7.1.0/
but it always seem to be complaining about a missing file (eg: fatal error: 'typeinfo' file not found or some other variant depending on which include I pass)

[Nekroze]

From what i wrote while working on this i think you are going too deep into the includes. Here i just gave the include folder itself and no deeper.

[timotheecour]

your link shows: ''-DD_CFLAGS="-cpp-args -I${stdenv.cc.cc}/include"''
I'm not using nix ; how would that translate on OSX ?
how would i truncate any of these?
/Users/timothee/homebrew/Cellar/gcc/7.1.0/include/c++/7.1.0/x86_64-apple-darwin16.7.0/
/Users/timothee/homebrew/Cellar/llvm@3.9/3.9.1_1/include/c++/v1/
/Users/timothee/homebrew/Cellar/gcc/7.1.0/include/c++/7.1.0/

likewise on ubuntu?
any help would be appreciated

[Nekroze]

Try truncating everything after include

[timotheecour]

using ccmake ..:
D_FLAGS -cpp-args=-I/Users/timothee/homebrew/Cellar/llvm/3.9.1/include

gives:
fatal error: 'typeinfo' file not found

NOTE: typeinfo is under:
/Users/timothee/homebrew/Cellar/llvm/3.9.1/include/c++/v1/typeinfo

EDIT:
if I have:
-cpp-args=-I/Users/timothee/usr/local/bin/../lib/clang/3.9.0/include I get:
missing typeinfo

If i I have -cpp-args=-I/Users/timothee/homebrew/Cellar/gcc/5.3.0/include/c++/5.3.0 I get:
exception:37:10: fatal error: 'bits/c++config.h' file not found

If I have both
-cpp-args=-I/Users/timothee/homebrew/Cellar/gcc/5.3.0/include/c++/5.3.0 -cpp-args=-I/Users/timothee/usr/local/bin/../lib/clang/3.9.0/include I also get:
Calypso/runtime/calypso/cpp/eh/unwind-cxx.h:33:10: fatal error: 'typeinfo' file not found

is that the proper way to pass multiple -cpp-args arguments?

[d-random-contributor]

Well, if calypso doesn't have all default C++ includes, you'll need to pass them explicitly.

[Syniurge]

@timotheecour try -cpp-args -stdlib=libstdc++, the unwind-cxx.h file is from GNU's libunwind and I don't really know how it fares with libc++.

And sorry for the late lazy replying, I've put Calypso aside to focus on dlang/dmd#7018 DMD's brittleness towards referencing errors being a blocker for many C++ libraries, especially since the latest Calypso commits. But a lot of DMD's code needs to be reorganized so it's taking longer than I thought.

What seems wrong here is that the standard lib paths should automatically be detected by Clang. But I'm not familiar and haven't tested Calypso on OS X/macOS at all yet (except the Travis-CI build which never went green), a couple of people tried in the past, IIRC it worked for @wilsonk, but that may have been before the C++ exception support.

Once the DMD PR is done I'll give something like MacInCloud a go to improve OS X support.

If -cpp-args -stdlib=libstdc++ doesn't work you can also specify the GNU libstdc++ include folders manually. On multilibs systems there are two folders to include, for example .../c++/X.X for typeinfo and .../<triple>/c++/X.X for bits/c++config.h.

is that the proper way to pass multiple -cpp-args arguments?

Yes it's one of them.

[timotheecour]

@Syniurge
this worked (in the sense that make succeeds, but facing other issues, cf other #60):

ccmake -D LLVM_CONFIG=$homebrew_D/Cellar/llvm@3.9/3.9.1_1/bin/llvm-config -D D_FLAGS="-cpp-args=-I/Users/timothee/homebrew//Cellar/gcc/7.2.0/include/c++/7.2.0;-cpp-args=-I/Users/timothee/homebrew//Cellar/gcc/7.2.0//include/c++/7.2.0/x86_64-apple-darwin17.2.0" ..

the key was to use ; in D_FLAGS

NOTE: doesn't work with llvm/5.0.0:
Calypso/deps/clang/utils/TableGen/ClangASTNodesEmitter.cpp:50:12: error: no viable conversion from returned value of type 'llvm::Twine' to function return type 'std::string' (aka 'basic_string<char, char_traits<char>, allocator<char> >')

also doesn't work with llvm/4.0.1:
Calypso/deps/clang/utils/TableGen/ClangASTNodesEmitter.cpp:50:24: error: invalid operands to binary expression ('llvm::StringRef' and 'const std::string' (aka 'const basic_string<char, char_traits<char>, allocator<char> >'))