Date: Sat, 20 May 2017 09:47:37 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: freebsd-ports@freebsd.org Cc: jmd@freebsd.org Subject: devel/flang can't link static images Message-ID: <20170520164737.GA32175@troutmask.apl.washington.edu>
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Testing the new devel/flang port shows a number of issues with the
/usr/local/bin/flang wrapper routine. The contents of the wrapper are
#!/bin/sh
/usr/local/flang/bin/flang -L/usr/local/flang/lib -lflang -lflangmain \
-lflangrti -lexecinfo $@
where I have wrapped the long line.
1) Compile only uses the -c option.
% flang -c a.f90
clang-3.9: warning: -lflang: 'linker' input unused
clang-3.9: warning: -lflangmain: 'linker' input unused
clang-3.9: warning: -lflangrti: 'linker' input unused
clang-3.9: warning: -lexecinfo: 'linker' input unused
clang-3.9: warning: argument unused during compilation: '-L/usr/local/flang/lib'
These warnings are complete nonsense and caused by the inclusion of
the libraries on the command line and the -L option. This noise
can be suppressed by inclusion of the -w option.
2) The port installs a number modules and include files in
/usr/local/flang/include. Flang cannot automatically find these
files, so simple programs of the form
use iso_fortran_env
print *, real_kinds
end
fail.
% flang -o z a.f90
F90-F-0004-Unable to open MODULE file iso_fortran_env.mod (a.f90: 1)
F90/x86-64 FreeBSD Flang - 1.5 2017-05-01: compilation aborted
This can be fixed by requiring the user to know to add
-I/usr/local/flang/include to her command line. A better
fix would be to include this option in the wrapper, so flang
can find the intrinsic modules.
3) flang cannot link static images.
% flang -o z -static a.f90 |& grep undefined | wc -l
105
There are 105 undefined references because required libraries are
missing. Here's just a few
/usr/ports/devel/flang/work/flang-a9ccdd7/runtime/flangrti/llcrit.c:(.text._mp_copyin_move_multiple+0x17): undefined reference to `__kmpc_global_thread_num'
/usr/ports/devel/flang/work/flang-a9ccdd7/runtime/flangrti/llcrit.c:(.text._mp_copyin_move_multiple+0x45): undefined reference to `__kmpc_threadprivate_cached'
/usr/ports/devel/flang/work/flang-a9ccdd7/runtime/flangrti/llcrit.c:(.text._mp_copyin_move_multiple+0x59): undefined reference to `__kmpc_threadprivate_cached'
/usr/ports/devel/flang/work/flang-a9ccdd7/runtime/flangrti/llcrit.c:(.text._mp_copyin_move_multiple+0x8d): undefined reference to `__kmpc_barrier'
/root/tmp/a-0fe0a5.o: In function `MAIN_':
/root/tmp/a-353577.ll:(.text+0x37): undefined reference to `f90io_print_init'
/root/tmp/a-353577.ll:(.text+0x4b): undefined reference to `_iso_fortran_env_8_'
/root/tmp/a-353577.ll:(.text+0x52): undefined reference to `f90io_ldw_a'
/root/tmp/a-353577.ll:(.text+0x5a): undefined reference to `f90io_ldw_end'
The undefined references with __kmpc prefixes appear to be
contained in /usr/local/flang/lib/libompstub.a. This library
should probably be included.
--
Steve
20170425 https://www.youtube.com/watch?v=VWUpyCsUKR4
20161221 https://www.youtube.com/watch?v=IbCHE-hONow
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