gcov: Support for the most streamlined profile of LLVM-embedded-toolc…

…hain-for-Arm

https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm/blob/main/samples/src/cpp-baremetal-semihosting-prof/proflib.c

Signed-off-by: wangmingrong1 <[email protected]>

libs/libc/Makefile

@@ -32,6 +32,7 @@ include dlfcn/Make.defs
 include errno/Make.defs
 include eventfd/Make.defs
 include fixedmath/Make.defs
+include gcov/Make.defs
 include gdbstub/Make.defs
 include grp/Make.defs
 include gnssutils/Make.defs

libs/libc/gcov/Kconfig

@@ -0,0 +1,16 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config LIB_GCOV
+	tristate "Enable GCOV support"
+	select HAVE_CXXINITIALIZE
+	default n
+	---help---
+		Enable GCOV support for code coverage analysis.
+		After turning on this option, code coverage can be analyzed.
+		If this option is enabled, image size and performance will be
+		significantly reduced. Before use, you need to add the
+		"-fprofile-instr-generate -fcoverage-mapping" compilation parameters
+		to the file to be analyzed.

libs/libc/gcov/Make.defs

@@ -0,0 +1,34 @@
+############################################################################
+# libs/libc/gcov/Make.defs
+#
+# 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.
+#
+############################################################################
+
+# Add the fixed precision math C files to the build
+
+ifeq ($(CONFIG_LIB_GCOV),y)
+	ifeq ($(CONFIG_ARCH_TOOLCHAIN_CLANG),y)
+		CSRCS += lib_clang.c
+	endif
+endif
+
+# Add the fixed precision math directory to the build
+
+DEPPATH += --dep-path gcov
+VPATH += :gcov