Build/install c++filt from g++, we already have all the sources and

it's and useful. (Ever tried to read 'nm' and 'ldd -v' output on a c++
object or library? :-) This filter decodes the mangled symbol names.)

Requested by: Chuck Robey <chuckr@glue.umd.edu>

gnu/usr.bin/cc/Makefile

@@ -1,7 +1,10 @@
 #
-# $Id$
+# $Id: Makefile,v 1.6 1996/09/19 15:37:58 peter Exp $
 #
 
-SUBDIR= cc_tools cc_int cpp cc1 cc cc1obj cc1plus c++ f77 libgcc doc
+# The order of some of these are rather important.  Some depend on previous
+# subdirs.
+
+SUBDIR= cc_tools cc_int cpp cc1 cc cc1obj cc1plus c++ f77 libgcc c++filt doc
 
 .include <bsd.subdir.mk>

gnu/usr.bin/cc/c++filt/Makefile

@@ -0,0 +1,55 @@
+#
+# $Id$
+#
+
+PROG =	c++filt
+SRCS =	cplus-dem.c getopt.c getopt1.c
+OBJS+=  underscore.o		# defeat 'make depend'
+BINDIR=	/usr/bin
+NOMAN=	1
+CFLAGS+= -DMAIN -DIN_GCC -DVERSION=\"$(version)\"
+
+
+#
+# XXX This is a hack, but it seems to work.  libgcc1.a is supposed to be
+# compiled by the native compiler, and libgcc2.a is meant to be compiled
+# by *this* version of gcc.
+#
+# Normally, this does not make any difference, since we only have gcc, but
+# when bootstrapping from gcc-2.6.3, we have to use the freshly built 2.7.2
+# compiler for some of the libgcc2.c __attribute__ stuff.
+#
+.if exists(${.OBJDIR}/../cc)
+XCC=	${.OBJDIR}/../cc/cc
+.else
+XCC=	${.CURDIR}/../cc/cc
+.endif
+
+.if exists(${.OBJDIR}/../cc1)
+XCC+=	-B${.OBJDIR}/../cc1/
+.else
+XCC+=	-B${.CURDIR}/../cc1/
+.endif
+
+.if exists(${.OBJDIR}/../cpp)
+XCC+=	-B${.OBJDIR}/../cpp/
+.else
+XCC+=	-B${.CURDIR}/../cpp/
+.endif
+
+CLEANFILES+= underscore.c
+underscore.o: underscore.c
+
+underscore.c:
+	echo "int xxy_us_dummy;" >tmp-dum.c
+	${XCC} -S tmp-dum.c
+	echo '/*WARNING: This file is automatically generated!*/' >underscore.c
+	if grep _xxy_us_dummy tmp-dum.s > /dev/null ; then \
+	  echo "int prepends_underscore = 1;" >>underscore.c; \
+	else \
+	  echo "int prepends_underscore = 0;" >>underscore.c; \
+	fi
+	rm -f tmp-dum.c tmp-dum.s
+
+.include <bsd.prog.mk>
+