non-fatal error during build of gcc versions > 4.8.5

[rofl0r]

echo | /root/musl-cross/gcc-5.3.0/build2/./gcc/xgcc -B/root/musl-cross/gcc-5.3.0
/build2/./gcc/ -E -dM - | \
  sed -n -e 's/^#define \([^_][a-zA-Z0-9_]*\).*/\1/p' \
        -e 's/^#define \(_[^_A-Z][a-zA-Z0-9_]*\).*/\1/p' | \
  sort -u > tmp-macro_list
cc1: error: no include path in which to search for stdc-predef.h
/bin/bash ../../gcc/../move-if-change tmp-macro_list macro_list
echo timestamp > s-macro_list
rm -rf include-fixed; mkdir include-fixed
chmod a+rx include-fixed

some context is provided to be more easily able to evaluate from where this is called.