Intel has deprecated -fopenmp in favour of -fiopenmp

git-svn-id: https://svn.r-project.org/R/trunk@84711 00db46b3-68df-0310-9c12-caf00c1e9a41

configure

@@ -26593,7 +26593,7 @@ then :
  ac_cv_prog_c_openmp='none needed'
 else $as_nop
  ac_cv_prog_c_openmp='unsupported'
- for ac_option in -xopenmp -fopenmp -qopenmp \
+     for ac_option in -xopenmp -fiopenmp -fopenmp -qopenmp \
  -openmp -mp -omp -qsmp=omp -homp \
  -fopenmp=libomp \
  -Popenmp --openmp; do
@@ -28090,7 +28090,7 @@ then :
  ac_cv_prog_fc_openmp='none needed'
 else $as_nop
  ac_cv_prog_fc_openmp='unsupported'
- for ac_option in -xopenmp -fopenmp -qopenmp \
+     for ac_option in -xopenmp -fiopenmp -fopenmp -qopenmp \
  -openmp -mp -omp -qsmp=omp -homp \
  -fopenmp=libomp \
  -Popenmp --openmp; do
@@ -42704,7 +42704,7 @@ then :
  ac_cv_prog_cxx_openmp='none needed'
 else $as_nop
  ac_cv_prog_cxx_openmp='unsupported'
- for ac_option in -xopenmp -fopenmp -qopenmp \
+     for ac_option in -xopenmp -fiopenmp -fopenmp -qopenmp \
  -openmp -mp -omp -qsmp=omp -homp \
  -fopenmp=libomp \
  -Popenmp --openmp; do
@@ -53754,7 +53754,7 @@ then :
  ac_cv_prog_fc_openmp='none needed'
 else $as_nop
  ac_cv_prog_fc_openmp='unsupported'
- for ac_option in -xopenmp -fopenmp -qopenmp \
+     for ac_option in -xopenmp -fiopenmp -fopenmp -qopenmp \
  -openmp -mp -omp -qsmp=omp -homp \
  -fopenmp=libomp \
  -Popenmp --openmp; do

m4/openmp.m4

@@ -1,7 +1,7 @@
 # This file is part of Autoconf. -*- Autoconf -*-
 # Programming languages support.
 # Copyright (C) 2001-2012 Free Software Foundation, Inc.
-# Copyright (C) 2015-2018 R Core Team
+# Copyright (C) 2015-2023 R Core Team
 
 # This file is part of Autoconf. This program is free
 # software; you can redistribute it and/or modify it under the
@@ -29,6 +29,7 @@
 # Roland McGrath, Noah Friedman, david d zuhn, and many others.
 
 # [a small part, modified for clang and Intel in 2015,6, Solaris in 2017.]
+# [Change for Intel preferring -fiopenmp and deprecating -fopenmp in 2023.]
 
 # _AC_LANG_OPENMP is a language-dependent program defined in c.m4 in
 # the autoconf library.
@@ -65,6 +66,7 @@ AC_DEFUN([R_OPENMP],
  dnl Intel -openmp (deprecated)
  dnl (https://software.intel.com/en-us/node/581863,
  dnl https://software.intel.com/en-us/node/525020)
+ dnl 2023 Intel: prefers -fiopenmp
  dnl SGI C, PGI C -mp
  dnl Tru64 Compaq C -omp
  dnl IBM C (AIX, Linux) -qsmp=omp
@@ -78,7 +80,7 @@ AC_DEFUN([R_OPENMP],
  dnl therefore the loop will continue searching for an option, and
  dnl no output file called 'penmp' or 'mp' is created.
  dnl Sept 2017: Solaris needs -xopenmp before -fopenmp
- for ac_option in -xopenmp -fopenmp -qopenmp \
+ for ac_option in -xopenmp -fiopenmp -fopenmp -qopenmp \
  -openmp -mp -omp -qsmp=omp -homp \
  -fopenmp=libomp \
  -Popenmp --openmp; do