On 10/01/18 14:00, Jonathan Wakely wrote: > On 9 Jan 2018 10:56 p.m., "Tim van Deurzen" <t...@kompiler.org>wrote: > > > Just to confirm with you, it does make sense to conditionally parse the > token for operator<=> in libcpp (i.e. only when the cxx standard being used > is >=2a)? I'm just wondering if this does not accidentally affect other > front-ends using libcpp? >
Maybe it is easier to say "gcc supports <=> in C++2a, and as an extension also supports it in C and C++ of any standard" ? I don't believe there is any way for it to conflict with existing valid code, so it would do no harm as a gcc extension like that - and C users can then use it too. > > Other front ends won't setthe language to C++2a. > > I think the relevant check is: > > if (CPP_OPTION (pfile, lang) == CLK_CXX2A > || CPP_OPTION (pfile, lang) == CLK_GNUCXX2A) > > This can only be true for a C++ source file when the standard is C++2a. >
