Initial Spring 2016 commit.

mk/fixdepends.sh

@@ -0,0 +1,83 @@
+#!/bin/sh
+# fixdepends.sh - munge gcc -M output
+# usage: gcc -M foo.c | fixdepends.sh INSTALLTOP host|native > .depend
+# (where INSTALLTOP is $(INSTALLTOP) from the build makefiles)
+
+if [ $# != 2 ]; then
+    echo "$0: Usage: $0 INSTALLTOP host|native" 1>&2
+    exit 1
+fi
+
+INSTALLTOP="$1"
+MODE="$2"
+
+case "$MODE" in
+    host|native) ;;
+    *) echo "$0: invalid mode $MODE; should be host or native" 1>&2
+       exit 1
+       ;;
+esac
+
+awk '
+    # Any blank lines appear between object files.
+    /^$/ {
+	printit();
+	next;
+    }
+    # A line beginning with a space is a second or subsequent line of
+    # depends.
+    /^ / {
+	for (i=1;i<=NF;i++) {
+	    if ($i != "\\") {
+		deps[++ndeps] = $i;
+	    }
+	}
+	next;
+    }
+    # Any other line begins a new object file.
+    {
+	# Print the object file we already have, if any.
+	printit();
+	# Trim the colon after the object file name.
+	object = $1;
+	sub(":$", "", object);
+	# If in host mode, change .o to .ho.
+	if (mode == "host") {
+	    sub("\\.o$", ".ho", object);
+	}
+	# Anything else on the line is a depend.
+	for (i=2;i<=NF;i++) {
+	    if ($i != "\\") {
+		deps[++ndeps] = $i;
+	    }
+	}
+	next;
+    }
+    END {
+	# Print the object file we have, if any, so as to not lose the
+	# last one.
+	printit();
+    }
+    function printit() {
+	if (ndeps == 0) {
+	    # We have no object file in progress, so do nothing.
+	    return;
+	}
+	# Insert MYBUILDDIR before the object file name.
+	printf "$(MYBUILDDIR)/%s: \\\n", object;
+	for (i=1;i<=ndeps;i++) {
+	    printf " %s", deps[i];
+	    # Lines before the last need continuation.
+	    if (i < ndeps) {
+		printf " \\";
+	    }
+	    printf "\n";
+	}
+	# We no longer have anything to print.
+	ndeps = 0;
+	object = "/WRONG";
+    }
+    # Afterwards run sed to substitute INSTALLTOP.
+' "mode=$MODE" | sed '
+	s,'"$INSTALLTOP"',$(INSTALLTOP),
+'