rust: Implement TARGET_RUST_OS_INFO for *-*-vxworks*

gcc/ChangeLog:

	* config.gcc (*-*-vxworks*): Set rust_target_objs and
	  target_has_targetrustm.
	* config/t-vxworks (vxworks-rust.o): New rule.
	* config/vxworks-rust.cc: New file.

3 files changed, 47 insertions, 0 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 2816fe9..d33e5df 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1053,6 +1053,9 @@ case ${target} in
   extra_headers="${extra_headers} ../vxworks/vxworks-predef.h"
   target_has_targetcm="yes"
 
+  rust_target_objs="${rust_target_objs} vxworks-rust.o"
+  target_has_targetrustm=yes
+
   # This private header exposes a consistent interface for checks on
   # the VxWorks version our runtime header files need to perform, based on
   # what the system headers adverstise:
diff --git a/gcc/config/t-vxworks b/gcc/config/t-vxworks
index 40c6cc4..7fb2adf 100644
--- a/gcc/config/t-vxworks
+++ b/gcc/config/t-vxworks
@@ -24,6 +24,10 @@ vxworks-c.o: $(srcdir)/config/vxworks-c.cc
 	$(COMPILE) $<
 	$(POSTCOMPILE)
 
+vxworks-rust.o: $(srcdir)/config/vxworks-rust.cc
+	$(COMPILE) $<
+	$(POSTCOMPILE)
+
 # We leverage $sysroot to find target system headers only, distributed
 # in a VxWorks (a)typical fashion with a different set of headers for
 # rtp vs kernel mode.  We setup SYSROOT_HEADERS_SUFFIX_SPEC to handle
diff --git a/gcc/config/vxworks-rust.cc b/gcc/config/vxworks-rust.cc
new file mode 100644
index 0000000..76d618c
--- /dev/null
+++ b/gcc/config/vxworks-rust.cc
@@ -0,0 +1,40 @@
+/* VxWorks support needed only by Rust front-end.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "tm_rust.h"
+#include "rust/rust-target.h"
+#include "rust/rust-target-def.h"
+
+/* Implement TARGET_RUST_OS_INFO for VxWorks targets.  */
+
+static void
+vxworks_rust_target_os_info (void)
+{
+  rust_add_target_info ("target_family", "unix");
+  rust_add_target_info ("target_os", "vxworks");
+  rust_add_target_info ("target_vendor", "wrs");
+  rust_add_target_info ("target_env", "gnu");
+}
+
+#undef TARGET_RUST_OS_INFO
+#define TARGET_RUST_OS_INFO vxworks_rust_target_os_info
+
+struct gcc_targetrustm targetrustm = TARGETRUSTM_INITIALIZER;