build: d/configure: severity prefix, instructions

Author: smoe

debian/configure

@@ -56,7 +56,7 @@ ENABLE_BUILD_DOCUMENTATION=--enable-build-documentation=pdf
 
 while test $# -ne 0; do
     case "$1" in
-    sim|uspace|noauto) echo "$1 is accepted for compatibility, but ignored";;
+    sim|uspace|noauto) echo "I: Argument $1 is accepted for compatibility, but ignored";;
     help|-h|--help) usage; exit 0 ;;
     no-docs|nodocs) unset ENABLE_BUILD_DOCUMENTATION ;;
     *)  echo 1>&2 "Unknown option: $1"
@@ -123,9 +123,9 @@ case $DISTRIB_NAME in
     Debian-10|Debian-10.*|Raspbian-10|Raspbian-10.*)
         ;;
     *)
-        echo "unknown distribution: $DISTRIB_NAME"
-        echo "detected dependencies may be incomplete or wrong"
-        echo "please consider fixing it and submitting a pull request"
+        echo "W: Unknown distribution: '$DISTRIB_NAME'."
+        echo "   Detected dependencies may be incomplete or wrong."
+        echo "   Please consider fixing it and submitting a pull request."
         ;;
 esac
 
@@ -210,7 +210,7 @@ fi
 
 rm -f ../build-stamp
 echo "I: Successfully configured for '$DISTRIB_NAME'."
-
+echo
 echo "I: You can now start the build of LinuxCNC Debian packages."
 echo "   To build and test everything: fakeroot debian/rules binary"
 echo "   To build the executables and man pages only: fakeroot debian/rules binary-arch"
@@ -221,3 +221,34 @@ else
     echo "   Building of documentation is disabled."
 fi
 echo "   The DEB_BUILD_OPTIONS environment variable also works with dpkg-buildpackage."
+echo
+
+if which dpkg-checkbuilddeps > /dev/null; then
+
+    if [ -n "$ENABLE_BUILD_DOCUMENTATION" ]; then
+        a=$(cd .. && dpkg-checkbuilddeps 2>&1 | sed -e "s/.*error: //" || true)
+        if [ -n "$a" ]; then
+            echo "W: To successfully build all of LinuxCNC, install the following build dependencies are mising:"
+	    echo "   $a"
+	    echo
+            echo "I: Missing packages are auto-installed by"
+            echo "     sudo apt build-dep ."
+        else
+            echo "I: No build dependencies missing for complete builds including documentation."
+        fi
+    else
+        a=$(cd .. && dpkg-checkbuilddeps -B 2>&1 | sed -e "s/.*error: //" || true)
+        if [ -n "$a" ]; then
+            echo "W: To successfully build LinuxCNC without documentation, the following build dependencies are mising:"
+	    echo "   $a"
+        else
+            echo "I: No dependencies missing for building binaries only."
+        fi
+    fi
+else
+    echo "W: Tool to check build-dependenices not found"
+    echo "   You may want to install it as follows:"
+    echo "     sudo apt install dpkg-dev"
+    echo "   and directly execute it like this:"
+    echo "     dpkg-checkbuilddeps"
+fi