------- Comment #7 from joseph at codesourcery dot com 2009-08-27 16:38 ------- Subject: Re: [4.5 regression] libgfortran fails to build on Solaris 10+: '_Imaginary_I' undeclared
On Thu, 27 Aug 2009, ro at techfak dot uni-bielefeld dot de wrote: > What I don't fully understand yet is whether imaginary support in GCC > isn't/won't be there simply because it's been removed from C99 or nobody > thinks the work to implement it is worthwile. It is: * Only in a non-normative Annex (C99 TC3 makes further changes to make it possible for an implementation of this Annex also to conform to base C99). * Not generally useful. * Something involving ABI issues for every target (you need to define how _Imaginary parameters are handled, in particular, and you can't just say "like corresponding real types" since float _Imaginary is not promoted to double _Imaginary when passed in variable arguments to a variadic function, whereas float is promoted to double). So you might want to disable this by default and only enable it for targets with a target hook to say the ABI has been agreed. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41169
