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[Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797

--- Comment #35 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #34)
> So all the files in ${allstamped} will have been created, which means all
> the symlinks will be present (assuming no errors from the $(LN_S) command,
> which may not be a safe assumption).

On this point, when FX removed the 2>/dev/null redirection there were no errors
shown, and several people have confirmed that when the error happens the
symlink *does* exist.

What I haven't seen any confirmation of is whether the symlink actually points
to the right file:

(In reply to Misty De Meo from comment #3)
> /private/tmp/gcc-20170815-16334-85805x/gcc-7.2.0/build/x86_64-apple-darwin17.
> 0.0/libstdc++-v3/include/istream:38:10: fatal error: ios: No such file or
> directory
>  #include <ios>
>           ^~~~~
> 
> I can confirm that $target/libstdc++-v3/include/ios exists.

and:

--- Comment #7 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
Yet another one:

In file included from
/Users/fx/ibin/x86_64-apple-darwin17.0.0/libstdc++-v3/include/bits/stl_algo.h:62:0,
                 from
/Users/fx/ibin/x86_64-apple-darwin17.0.0/libstdc++-v3/include/algorithm:62,
                 from
/Users/fx/gcc-7.1.0/libstdc++-v3/include/precompiled/stdc++.h:65:
/Users/fx/ibin/x86_64-apple-darwin17.0.0/libstdc++-v3/include/bits/stl_tempbuf.h:60:10:
fatal error: bits/stl_construct.h: No such file or directory
 #include <bits/stl_construct.h>
          ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[5]: *** [x86_64-apple-darwin17.0.0/bits/stdc++.h.gch/O2g.gch] Error 1

Yet when make aborts, the file
x86_64-apple-darwin17.0.0/libstdc++-v3/include/bits/stl_construct.h is present.


Can somebody confirm the links are not only present, but point to the relevant
file in the source tree?

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