This adds an empty module.cc file, along with make rules to build it.
gcc/cp/
* module.cc: New dummy file.
* Make-lang.in: Add rules to build module.o
pushing to trunk
--
Nathan Sidwell
diff --git c/gcc/cp/Make-lang.in w/gcc/cp/Make-lang.in
index 6be4678776b..de64d592a0d 100644
--- c/gcc/cp/Make-lang.in
+++ w/gcc/cp/Make-lang.in
@@ -54,6 +54,9 @@ c++.serial: c++
CFLAGS-cp/g++spec.o += $(DRIVER_DEFINES)
+CFLAGS-cp/module.o += -DHOST_MACHINE=\"$(host)\" \
+ -DTARGET_MACHINE=\"$(target)\"
+
# Create the compiler driver for g++.
GXX_OBJS = $(GCC_OBJS) cp/g++spec.o
xg++$(exeext): $(GXX_OBJS) $(EXTRA_GCC_OBJS) libcommon-target.a $(LIBDEPS)
@@ -81,7 +84,7 @@ CXX_AND_OBJCXX_OBJS = \
cp/error.o cp/except.o cp/expr.o \
cp/friend.o cp/init.o \
cp/lambda.o cp/lex.o cp/logic.o \
- cp/mangle.o cp/method.o \
+ cp/mangle.o cp/method.o cp/module.o \
cp/name-lookup.o cp/optimize.o \
cp/parser.o cp/pt.o cp/ptree.o \
cp/rtti.o \
diff --git c/gcc/cp/module.cc w/gcc/cp/module.cc
new file mode 100644
index 00000000000..596061b3c49
--- /dev/null
+++ w/gcc/cp/module.cc
@@ -0,0 +1,21 @@
+/* C++ modules. Experimental!
+ Copyright (C) 2017-2020 Free Software Foundation, Inc.
+ Written by Nathan Sidwell <nat...@acm.org> while at FaceBook
+
+ This file is part of GCC.
+
+ GCC is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ GCC is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+/* This file intentionally left empty. */
