arch/arm: Move lib_dummy.c from arch/arm/src/common/ghs to libs/libc/machine/arm

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

libs/libc/machine/arm/CMakeLists.txt

@@ -52,6 +52,10 @@ if(NOT CONFIG_LIBSUPCXX_TOOLCHAIN)
   list(APPEND SRCS arch_atexit.c)
 endif()
 
+if(CONFIG_ARCH_TOOLCHAIN_GHS)
+  list(APPEND SRCS arch_dummy.c)
+endif()
+
 if(CONFIG_CXX_EXCEPTION)
   list(APPEND SRCS arch_unwind_find_exidx.c)
 endif()

libs/libc/machine/arm/Make.defs

@@ -50,6 +50,10 @@ ifneq ($(CONFIG_LIBSUPCXX_TOOLCHAIN),y)
 CSRCS += arch_atexit.c
 endif
 
+ifeq ($(CONFIG_ARCH_TOOLCHAIN_GHS),y)
+  CMN_CSRCS += arch_dummy.c
+endif
+
 ifeq ($(CONFIG_CXX_EXCEPTION),y)
 CSRCS += arch_unwind_find_exidx.c
 endif

libs/libc/machine/arm/arch_dummy.c

@@ -0,0 +1,53 @@
+/****************************************************************************
+ * libs/libc/machine/arm/arch_dummy.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdint.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/* The following functions is needed by libmath that introduced by default
+ * in the Greenhills toolchain, in nuttx we do not really need these
+ * function, so add dummy implementation here to avoid the link error
+ */
+
+void __gh_long_long_printf(void)
+{
+}
+
+void __gh_float_printf(void)
+{
+}
+
+void __gh_fputs_stdout(void)
+{
+}
+
+void __gh_set_errno(int errno)
+{
+}