hints/linux out of date for Intel (icc) compiler

[hvds]

hints/linux.sh uses this stanza for Intel's compiler:

*"Intel(R) C"*" Compiler"*)
    # record the version, formats:
    # icc (ICC) 10.1 20080801
    # icpc (ICC) 10.1 20080801
    # followed by a copyright on the second line
    ccversion=`${cc:-cc} --version | sed -n -e 's/^icp\?c \((ICC) \)\?//p'`
    # This is needed for Configure's prototype checks to work correctly
    # The -mp flag is needed to pass various floating point related tests
    # The -no-gcc flag is needed otherwise, icc pretends (poorly) to be gcc
    ccflags="-we147 -mp -no-gcc $ccflags"

I managed to install this using spack, via spack install intel-oneapi-compilers, which gave me this:

% icc --version
icc (ICC) 2021.2.0 20210228
Copyright (C) 1985-2021 Intel Corporation.  All rights reserved.

% 

and it appears to build perl fine (at least as far as a clean minitest); however it warns that -mp is an unknown flag, and the docs advise that -we is deprecated in favour of -diag-error. Blame log shows that we added -mp via 383f935 to replace an -mp1 added a few months earlier (3d7ef91), and -mp1 is still supported. However it isn't obvious if we need any of these flags these days.

I don't regularly use this compiler, so I don't know what intervening versions have existed, nor when the supported flags may have changed. I'd welcome suggestions for how to improve the hints file.