https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
--- Comment #10 from Jack Howarth <howarth.at.gcc at gmail dot com> ---
I managed to reproduce this issue on an 8 core non-HT system booted from an
APFS volume on an old SATA2 HDD so the issue doesn't seem to be dependent on
really fast IO...
Making all in include
mkdir -p ./x86_64-apple-darwin17.0.0/bits/stdc++.h.gch
mkdir -p ./x86_64-apple-darwin17.0.0/bits/stdc++.h.gch
/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/./gcc/xgcc -shared-libgcc
-B/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/./gcc -nostdinc++
-L/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/src
-L/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/src/.libs
-L/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/libsupc++/.libs
-B/sw/lib/gcc7/x86_64-apple-darwin17.0.0/bin/
-B/sw/lib/gcc7/x86_64-apple-darwin17.0.0/lib/ -isystem
/sw/lib/gcc7/x86_64-apple-darwin17.0.0/include -isystem
/sw/lib/gcc7/x86_64-apple-darwin17.0.0/sys-include -x c++-header -nostdinc++
-g -O2
-I/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/include/x86_64-apple-darwin17.0.0
-I/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/include
-I/sw/src/fink.build/gcc7-7.2.0-1/gcc-7.2.0/libstdc++-v3/libsupc++
-I/sw/include -O2 -g -std=gnu++0x
/sw/src/fink.build/gcc7-7.2.0-1/gcc-7.2.0/libstdc++-v3/include/precompiled/stdc++.h
\
-o x86_64-apple-darwin17.0.0/bits/stdc++.h.gch/O2ggnu++0x.gch
/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/./gcc/xgcc -shared-libgcc
-B/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/./gcc -nostdinc++
-L/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/src
-L/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/src/.libs
-L/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/libsupc++/.libs
-B/sw/lib/gcc7/x86_64-apple-darwin17.0.0/bin/
-B/sw/lib/gcc7/x86_64-apple-darwin17.0.0/lib/ -isystem
/sw/lib/gcc7/x86_64-apple-darwin17.0.0/include -isystem
/sw/lib/gcc7/x86_64-apple-darwin17.0.0/sys-include -x c++-header -nostdinc++
-g -O2
-I/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/include/x86_64-apple-darwin17.0.0
-I/sw/src/fink.build/gcc7-7.2.0-1/darwin_objdir/x86_64-apple-darwin17.0.0/libstdc++-v3/include
-I/sw/src/fink.build/gcc7-7.2.0-1/gcc-7.2.0/libstdc++-v3/libsupc++
-I/sw/include -O2 -g
/sw/src/fink.build/gcc7-7.2.0-1/gcc-7.2.0/libstdc++-v3/include/precompiled/stdc++.h
-o x86_64-apple-darwin17.0.0/bits/stdc++.h.gch/O2g.gch
/sw/src/fink.build/gcc7-7.2.0-1/gcc-7.2.0/libstdc++-v3/include/precompiled/stdc++.h:35:10:
fatal error: cctype: No such file or directory
#include <cctype>
^~~~~~~~
compilation terminated.
make[5]: *** [x86_64-apple-darwin17.0.0/bits/stdc++.h.gch/O2g.gch] Error 1
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [all-recursive] Error 1
make[3]: *** [all] Error 2
make[2]: *** [all-stage1-target-libstdc++-v3] Error 2
make[1]: *** [stage1-bubble] Error 2
