add backwards compatibility for those relying on empty cpuinfo

client/icecc-create-env.in

@@ -481,6 +481,17 @@ if test -n "$clang"; then
 
     search_addfile $orig_clang as /usr/bin
     search_addfile $orig_clang objcopy /usr/bin
+
+    # HACK: Clang4.0 and later access /proc/cpuinfo and report an error when they fail
+    # to find it, even if they use a fallback mechanism, making the error useless
+    # (at least in this case). Since the file is not really needed, create a fake one.
+    # Only add an empty file if the user did not attempt to add there own.
+    if test -d /proc && [[ $extrafiles != *" /proc/cpuinfo"* ]]; then
+        mkdir $tempdir/fakeproc
+        mkdir $tempdir/fakeproc/proc
+        touch $tempdir/fakeproc/proc/cpuinfo
+        add_file $tempdir/fakeproc/proc/cpuinfo /proc/cpuinfo
+    fi
 fi
 
 # Do not do any prefix stripping on extra files, they (e.g. clang plugins) are usually