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

[Sean Silva]

On Wed, Oct 22, 2014 at 9:09 PM, Seth Cantrell <seth.cantrell at gmail.com>
wrote:

> I saw this error when I tried out -fmodules on OS X earlier as well, but
> it disappeared and I took it to be transient and due to something in my
> build of llvm/clang/libcxx. Now of course I'm seeing it again and I have no
> idea what allowed -fmodules to work for me before.
>
> I tried Sean's suggestion of "moving `#include <__locale>` below `#include
> <cstdlib>`". To get things to build I had to put both of the following:
>
>     #include <cstdlib>
>     #include <xlocale/_stdlib.h>
>
> before `#include <__locale>` in the `<locale>` header. Since
> `<xlocale/_stdlib.h>` is not in a module map (AFAICT,
> MacOSX10.10.sdk/usr/include/module.map does not mention the xlocale headers
> in the 10.10 SDK) I believe the included declarations become part of the
> `<locale>` module...
>

You may want to file a bug with Apple about this issue with the system
headers. This issue seems like it would affect C/ObjC (which are officially
supported) just the same as C++.

-- Sean Silva


>
> > On Oct 21, 2014, at 7:57 AM, Stephen Kelly <steveire at gmail.com> wrote:
> >
> > /Users/ske/dev/prefix/bin/../include/c++/v1/locale:943:28: error: use of
> > undeclared identifier 'strtold_l'
> >        long double __ld = strtold_l(__a, &__p2, _LIBCPP_GET_C_LOCALE);
> >                           ^
> > test.cpp:6:10: fatal error: could not build module 'std'
> > #include <utility>
> > ~~~~~~~~^
> >
> >
>
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