libs/libm: migrate to SPDX identifier

Most tools used for compliance and SBOM generation use SPDX identifiers
This change brings us a step closer to an easy SBOM generation.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>

libs/libm/CMakeLists.txt

@@ -1,6 +1,8 @@
 # ##############################################################################
 # libs/libm/CMakeLists.txt
 #
+# 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

libs/libm/Makefile

@@ -1,6 +1,8 @@
 ############################################################################
 # libs/libm/Makefile
 #
+# 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

libs/libm/bin/Makefile

@@ -1,6 +1,8 @@
 ############################################################################
 # libs/libm/bin/Makefile
 #
+# 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

libs/libm/kbin/Makefile

@@ -1,6 +1,8 @@
 ############################################################################
 # libs/libm/kbin/Makefile
 #
+# 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

libs/libm/libm/CMakeLists.txt

@@ -1,6 +1,8 @@
 # ##############################################################################
 # libs/libm/libm/CMakeLists.txt
 #
+# 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

libs/libm/libm/Make.defs

@@ -1,6 +1,8 @@
 ############################################################################
 # libs/libm/libm/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

libs/libm/libm/__cos.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/__cos.c
  *
- *   Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (C) 1993 by Sun Microsystems, Inc.
  *
  *   Developed at SunSoft, a Sun Microsystems, Inc. business.
  *   Permission to use, copy, modify, and distribute this

libs/libm/libm/__sin.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/__sin.c
  *
- *   Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (C) 1993 by Sun Microsystems, Inc.
  *
  *   Developed at SunSoft, a Sun Microsystems, Inc. business.
  *   Permission to use, copy, modify, and distribute this

libs/libm/libm/arm/CMakeLists.txt

@@ -1,6 +1,8 @@
 # ##############################################################################
 # libs/libm/libm/arm/CMakeLists.txt
 #
+# 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

libs/libm/libm/arm/Make.defs

@@ -1,6 +1,8 @@
 ############################################################################
 # libs/libm/libm/arm/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

libs/libm/libm/arm/armv7-m/CMakeLists.txt

@@ -1,6 +1,8 @@
 # ##############################################################################
 # libs/libm/libm/arm/armv7-m/CMakeLists.txt
 #
+# 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

libs/libm/libm/arm/armv7-m/Make.defs

@@ -1,6 +1,8 @@
 ############################################################################
 # libs/libm/libm/arm/armv7-m/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

libs/libm/libm/arm/armv7-m/arch_fabsf.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv7-m/arch_fabsf.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

libs/libm/libm/arm/armv7-m/arch_sqrtf.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv7-m/arch_sqrtf.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

libs/libm/libm/arm/armv8-m/CMakeLists.txt

@@ -1,6 +1,8 @@
 # ##############################################################################
 # libs/libm/libm/arm/armv8-m/CMakeLists.txt
 #
+# 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

libs/libm/libm/arm/armv8-m/Make.defs

@@ -1,6 +1,8 @@
 ############################################################################
 # libs/libm/libm/arm/armv8-m/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

libs/libm/libm/arm/armv8-m/arch_ceil.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_ceil.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_ceilf.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_ceilf.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_floor.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_floor.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_floorf.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_floorf.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_nearbyint.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_nearbyint.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_nearbyintf.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_nearbyintf.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_rint.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_rint.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_rintf.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_rintf.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_round.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_round.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_roundf.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_roundf.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_trunc.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_trunc.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/arm/armv8-m/arch_truncf.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/arm/armv8-m/arch_truncf.c
  *
- *   Copyright (c) 2011, 2012 ARM Ltd.  All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright (c) 2011, 2012 ARM Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

libs/libm/libm/lib_acos.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_acos.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_acosf.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_acosf.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_acosh.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_acosh.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

libs/libm/libm/lib_acoshf.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_acoshf.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

libs/libm/libm/lib_acoshl.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_acoshl.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

libs/libm/libm/lib_acosl.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_acosl.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_asin.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_asin.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012, 2015-2016 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2015-2016 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_asinf.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_asinf.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012, 2016 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012, 2016 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_asinh.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_asinh.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

libs/libm/libm/lib_asinhf.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_asinhf.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

libs/libm/libm/lib_asinhl.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_asinhl.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

libs/libm/libm/lib_asinl.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_asinl.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012, 2016 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012, 2016 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_atan.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_atan.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_atan2.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_atan2.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_atan2f.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_atan2f.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_atan2l.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_atan2l.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_atanf.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_atanf.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_atanh.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_atanh.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

libs/libm/libm/lib_atanhf.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_atanhf.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

libs/libm/libm/lib_atanhl.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_atanhl.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

libs/libm/libm/lib_atanl.c

@@ -1,10 +1,9 @@
 /****************************************************************************
  * libs/libm/libm/lib_atanl.c
  *
- * This file is a part of NuttX:
- *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
- *   Ported by: Darcy Gong
+ * SPDX-License-Identifier: ISC
+ * SPDX-FileCopyrightText: Copyright (C) 2012 Gregory Nutt.
+ * SPDX-FileContributor: Ported by: Darcy Gong
  *
  * It derives from the Rhombus OS math library by Nick Johnson which has
  * a compatible, MIT-style license:

libs/libm/libm/lib_cbrt.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * libs/libm/libm/lib_cbrt.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
@@ -52,4 +54,4 @@ double cbrt(double x)
     }
 }
 
-#endif
+#endif