https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57845
--- Comment #9 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > I'm trying to upgrade from 3.4.4 to 5.2.0, and I used -freg-struct-return > for years with 3.4.4 with no issues. Not that there is huge amount of code > that actually uses functions returning structures, but the project itself is > about 5Mb of compiled code. Certainly fascinating. I have been working on GCC for almost 15 years and did not see a single mention of the option over these years. There is not a single test in the testsuite that exercises it. When I overhauled the implementation of the calling conventions in the SPARC back-end for GCC 3.4.x: https://gcc.gnu.org/gcc-3.4/sparc-abi.html I didn't know that it was even existing. This stuff looks a bit magical... > On the other hand, I doubt the case I provided works in 5.2.0 by pure > accident either, and there is some hope a fix for the ICE is rather simple > for somebody who is familiar with gcc code base. Admittedly, I'll have a look then.
