[patch #9442] Add flang (LLVM-based compiler) support

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Follow-up Comment #3, patch#9442 (group libtool):

Seems this patch does not fully address the problem.

+ libtool --version
 libtool (GNU libtool) 2.4.7.65-e11f

For example, building hdf5 with the ARM compiler, with an MPI compiler
wrapper
I still get this error:

flang: error: unknown argument: '-soname'

Looking at the libtool script produced by configure,
I still see empty wl= 

11810 # ### BEGIN LIBTOOL TAG CONFIG: FC
11811       
11812 # The linker used to build libraries.
11813
LD="/bm/ashterenli/install/arm-compiler-for-linux_23.10_AmazonLinux-2/gcc-12.2.0_AmazonLinux-2/aarch64-linux-gnu/bin/ld"
11814         
11815 # How to create reloadable object files.
11816 reload_flag=" -r"
11817 reload_cmds="\$LD\$reload_flag -o \$output\$reload_objs"
11818         
11819 # Commands used to build an old-style archive.
11820 old_archive_cmds="\$AR \$AR_FLAGS \$oldlib\$oldobjs~\$RANLIB
\$tool_oldlib"
11821         
11822 # A language specific compiler.
11823 CC="ftn"
11824 
11825 # Is the compiler the GNU compiler?
11826 with_gcc=no
11827       
11828 # Compiler flag to turn off builtin functions.
11829 no_builtin_flag=""
11830       
11831 # Additional compiler flags for building library objects.
11832 pic_flag=""
11833       
11834 # How to pass a linker flag through the compiler.
11835 wl=""   


And I still have to fix the libtool script with:

sed -i -e 's/wl=""/wl="-Wl,"/g' libtool

which I got from: https://github.com/Unidata/netcdf-fortran/issues/309






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