tweak scripts/gen_build_files.sh

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 9 insertions, 8 deletions

diff --git a/scripts/gen_build_files.sh b/scripts/gen_build_files.sh
index 300d90c2a..3d757500c 100644
--- a/scripts/gen_build_files.sh
+++ b/scripts/gen_build_files.sh
@@ -1,14 +1,13 @@
 #!/bin/sh
 
-test $# -ge 2 || exit 1
+test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
 
 # cd to objtree
-cd "$2" || exit 1
+cd "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
 
 srctree="$1"
 
-find -type d \
-| while read; do
+find -type d | while read; do
     d="$REPLY"
 
     src="$srctree/$d/Kbuild.src"
@@ -16,11 +15,12 @@ find -type d \
     if test -f "$src"; then
         echo "  CHK     $dst"
 
-        s=`grep -h '^//kbuild:' "$srctree/$d"/*.c | sed 's^//kbuild:^^'`
+        s=`sed -n 's@^//kbuild:@@p' "$srctree/$d"/*.c`
+        echo "# DO NOT EDIT. This file is generated from Kbuild.src" >"$dst.$$.tmp"
         while read; do
             test x"$REPLY" = x"INSERT" && REPLY="$s"
             printf "%s\n" "$REPLY"
-        done <"$src" >"$dst.$$.tmp"
+        done <"$src" >>"$dst.$$.tmp"
 
         if test -f "$dst" && cmp -s "$dst.$$.tmp" "$dst"; then
             rm "$dst.$$.tmp"
@@ -35,11 +35,12 @@ find -type d \
     if test -f "$src"; then
         echo "  CHK     $dst"
 
-        s=`grep -h '^//config:' "$srctree/$d"/*.c | sed 's^//config:^^'`
+        s=`sed -n 's@^//config:@@p' "$srctree/$d"/*.c`
+        echo "# DO NOT EDIT. This file is generated from Config.src" >"$dst.$$.tmp"
         while read; do
             test x"$REPLY" = x"INSERT" && REPLY="$s"
             printf "%s\n" "$REPLY"
-        done <"$src" >"$dst.$$.tmp"
+        done <"$src" >>"$dst.$$.tmp"
 
         if test -f "$dst" && cmp -s "$dst.$$.tmp" "$dst"; then
             rm "$dst.$$.tmp"