https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85915
--- Comment #7 from Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail dot Com> --- Ebuild for GCC 7 branch is not available in Gentoo. I guess that the relevant commit is: https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=258647 https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=b67700aa0344abbbdb50d150c628475e747b316f I have backported this commit and 6 earlier commits to GCC 7.3.0 and this patched GCC 7.3.0 now seems to work (both with -mfunction-return=thunk and with default -mfunction-return=keep). I guess that the same ABI incompatibility will exist between vanilla GCC 7.3.0 and future GCC 7.4.0 as between vanilla GCC 7.3.0 and GCC 8.1.0. If it is not possible to have ABI compatibility while still keeping fixed behavior (not generating aliases for function return thunks), then I suggest that documentation mention this ABI incompatibility. The relevant places would be: https://gcc.gnu.org/gcc-7/changes.html (mentioning ABI incompatibility between GCC 7.3.0 and >=7.4.0) https://gcc.gnu.org/gcc-7/porting_to.html (mentioning ABI incompatibility between GCC 7.3.0 and >=7.4.0) https://gcc.gnu.org/gcc-8/changes.html (mentioning ABI incompatibility between GCC 7.3.0 and >=8) https://gcc.gnu.org/gcc-8/porting_to.html (mentioning ABI incompatibility between GCC 7.3.0 and >=8)
