https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
--- Comment #12 from Jack Howarth <howarth.at.gcc at gmail dot com> ---
Just to add in things that don't fix these failures, the following doesn't
help...
--- gcc-7.2.0/libstdc++-v3/include/Makefile.in.orig 2017-09-02
11:00:08.000000000 -0400
+++ gcc-7.2.0/libstdc++-v3/include/Makefile.in 2017-09-02 11:12:38.000000000
-0400
@@ -1887,16 +1887,37 @@
# developer tries to create them via make in the include build
# directory. (This is more of an example of how this kind of rule can
# be made.)
-.PRECIOUS: $(std_headers) $(c_base_headers) $(tr1_headers) $(tr2_headers)
+.PRECIOUS: $(std_headers) $(bits_headers) $(c_base_headers) $(tr1_headers)
$(tr2_headers)
$(decimal_headers) $(ext_headers) $(experimental_headers)
- $(experimental_bits_headers)
+ $(experimental_bits_headers) $(bits_host_headers)
$(bits_sup_headers)
+ $(backward_headers) $(ext_compat_headers) $(ext_host_headers)
+ $(experimental_filesystem_headers)
$(experimental_bits_filesystem_headers)
+ $(c_compatibility_headers) $(debug_headers) $(parallel_headers)
+ $(profile_headers) $(profile_impl_headers) $(host_headers)
$(thread_host_headers)
$(std_headers): ; @:
+$(bits_headers): ; @:
+$(bits_host_headers): ; @:
+$(bits_sup_headers): ; @:
+$(backward_headers): ; @:
$(c_base_headers): ; @:
$(tr1_headers): ; @:
+$(tr2_headers): ; @:
$(decimal_headers): ; @:
$(ext_headers): ; @:
+$(ext_compat_headers): ; @:
+$(ext_host_headers): ; @:
$(experimental_headers): ; @:
$(experimental_bits_headers): ; @:
+$(experimental_filesystem_headers): ; @:
+$(experimental_bits_filesystem_headers): ; @:
+$(c_compatibility_headers): ; @:
+$(debug_headers): ; @:
+$(parallel_headers): ; @:
+$(profile_headers): ; @:
+$(profile_impl_headers): ; @:
+$(host_headers): ; @:
+$(thread_host_headers): ; @:
+
# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
