[cfe-dev] How do I try out C++ modules with clang?

[Nico Weber]

>
> Any idea what's going wrong?
>
> $ clang++ -E -fmodules test.cpp
> # 1 "test.cpp"
> # 1 "<built-in>" 1
> # 1 "<built-in>" 3
> # 325 "<built-in>" 3
> # 1 "<command line>" 1
> # 1 "<built-in>" 2
> # 1 "test.cpp" 2
> While building module 'std' imported from test.cpp:6:
> In file included from <module-includes>:4:
> In file included from
> /Users/ske/dev/prefix/bin/../include/c++/v1/ccomplex:21:
> In file included from
> /Users/ske/dev/prefix/bin/../include/c++/v1/complex:247:
> In file included from
> /Users/ske/dev/prefix/bin/../include/c++/v1/sstream:174:
> In file included from
> /Users/ske/dev/prefix/bin/../include/c++/v1/ostream:140:
> /Users/ske/dev/prefix/bin/../include/c++/v1/locale:873:26: error: use of
> undeclared identifier 'strtoll_l'; did you mean 'wcstoll_l'?
>         long long __ll = strtoll_l(__a, &__p2, __base,
> _LIBCPP_GET_C_LOCALE);
>

I ran into this too ( http://llvm.org/bugs/show_bug.cgi?id=21003 ). It went
away for me when building with -fno-exceptions. Maybe you can post the
number of the rdar you filed on that bug? With -fno-exceptions and
http://llvm.org/viewvc/llvm-project?rev=218372 (or -std=c++11), I was able
to use modules on OS X for a small program (ninja) 4 weeks ago.

(I didn't read the whole thread, sorry if this is redundant information.)
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