https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
--- Comment #15 from Jack Howarth <howarth.at.gcc at gmail dot com> --- Maybe I'm just thick, but from the generated x86_64-apple-darwin17.0.0/libstdc++-v3/include/Makefile, it is entirely unclear to me how the stamp mechanism and the current install-headers insures that install-headers has completed in its entirety. The way I read the current Makefile is that it is merely checking for the existence of the include subdirectories having been installed and not that that they have been completely populated. Looks like a broken implementation of stamps to me.
