[Bug libstdc++/90770] Building with --enable-libstdcxx-debug and make profiledbootstrap fails with mv: cannot stat 'Makefile': No such file or directory

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90770

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The problem is that the src/debug directory exists, but has no Makefile. The
recipe for the stamp-debug target only checks whether the directory exists, so
does not create any Makefiles:

if test ! -d
/home/eus/buildzone/gcc-9-build/x86_64-linux-gnu/libstdc++-v3/src/debug; then \
  mkdir -p
/home/eus/buildzone/gcc-9-build/x86_64-linux-gnu/libstdc++-v3/src/debug; \
  for d in c++98 c++11 c++17 filesystem; do mkdir -p 
/home/eus/buildzone/gcc-9-build/x86_64-linux-gnu/libstdc++-v3/src/debug/$d;
done; \
  (cd /home/eus/buildzone/gcc-9-build/x86_64-linux-gnu/libstdc++-v3/src/debug;
\
  sed -e 's/top_builddir = \.\./top_builddir = ..\/../' \
      -e 's/top_build_prefix = \.\./top_build_prefix = ..\/../' \
      -e 's/srcdir = \.\./srcdir = ..\/../' \
      -e 's/VPATH = \.\./VPATH = ..\/../' \
      -e 's/glibcxx_basedir = \.\./glibcxx_basedir = ..\/../' \
      -e 's/MKDIR_P = \.\./MKDIR_P = ..\/../' \
  < ../Makefile > Makefile ; \
  for d in . c++98 c++11 c++17 filesystem; do \
  sed -e 's/top_builddir = \.\./top_builddir = ..\/../' \
      -e 's/top_build_prefix = \.\./top_build_prefix = ..\/../' \
      -e 's/srcdir = \.\./srcdir = ..\/../' \
      -e 's/VPATH = \.\./VPATH = ..\/../' \
      -e 's/glibcxx_basedir = \.\./glibcxx_basedir = ..\/../' \
      -e 's/MKDIR_P = \.\./MKDIR_P = ..\/../' \
  < ../$d/Makefile > $d/Makefile ; \
  done) ; \
fi; \
echo `date` > stamp-debug;

I'm not yet sure where all the makefiles have gone. If the 'clean-local' target
had been used it should have removed the directory.