Revert "removed unused file"

This reverts commit b9101e67ab.

share/genbuild.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+if [ $# -gt 1 ]; then
+    cd "$2"
+fi
+if [ $# -gt 0 ]; then
+    FILE="$1"
+    shift
+    if [ -f "$FILE" ]; then
+        INFO="$(head -n 1 "$FILE")"
+    fi
+else
+    echo "Usage: $0 <filename> <srcroot>"
+    exit 1
+fi
+
+DESC=""
+SUFFIX=""
+LAST_COMMIT_DATE=""
+if [ -e "$(which git 2>/dev/null)" -a "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = "true" ]; then
+    # clean 'dirty' status of touched files that haven't been modified
+    git diff >/dev/null 2>/dev/null 
+
+    # if latest commit is tagged and not dirty, then override using the tag name
+    RAWDESC=$(git describe --abbrev=0 2>/dev/null)
+    if [ "$(git rev-parse HEAD)" = "$(git rev-list -1 $RAWDESC 2>/dev/null)" ]; then
+        git diff-index --quiet HEAD -- && DESC=$RAWDESC
+    fi
+
+    # otherwise generate suffix from git, i.e. string like "59887e8-dirty"
+    SUFFIX=$(git rev-parse --short HEAD)
+    git diff-index --quiet HEAD -- || SUFFIX="$SUFFIX-dirty"
+
+    # get a string like "2012-04-10 16:27:19 +0200"
+    LAST_COMMIT_DATE="$(git log -n 1 --format="%ci")"
+fi
+
+if [ -n "$DESC" ]; then
+    NEWINFO="#define BUILD_DESC \"$DESC\""
+elif [ -n "$SUFFIX" ]; then
+    NEWINFO="#define BUILD_SUFFIX $SUFFIX"
+else
+    NEWINFO="// No build information available"
+fi
+
+# only update build.h if necessary
+if [ "$INFO" != "$NEWINFO" ]; then
+    echo "$NEWINFO" >"$FILE"
+    if [ -n "$LAST_COMMIT_DATE" ]; then
+        echo "#define BUILD_DATE \"$LAST_COMMIT_DATE\"" >> "$FILE"
+    fi
+fi