One other comment. What version of the ld64 port do you have installed ? If it is not using the xcode variant, then please reinstall in using that

 > port installed ld64
The following ports are currently installed:
  ld64 @3_1+ld64_xcode (active)

if you do not get the above, run

> sudo port -f uninstall ld64
> sudo port install ld64


On 23/10/2019 9:21 am, Chris Jones wrote:

( Please always reply to the list )

The error below looks like one we addressed recently. Have you updated your ports ? Please run

 > sudo port sync
 > sudo port upgrade outdated

then try again.


On 23/10/2019 9:17 am, Hans Goedbloed wrote:
Thanks Chris,

Looks like what I hoped for: no other tools than gcc9 needed.
However, when I do precisely what you said, I still get

hanss-imac:resabs hansgoedbloed$ gfortran-mp-9 -o test.exe ./test.f
ld: library not found for -lSystem
collect2: error: ld returned 1 exit status

All the libraries listed from your otool command are there, except /usr/lib/libSystem.B.dylib.
Could that be the problem?


From: macports-users <macports-users-boun...@lists.macports.org> on behalf of Chris Jones <jon...@hep.phy.cam.ac.uk>
Sent: Tuesday, October 22, 2019 7:09 PM
To: macports-users@lists.macports.org
Subject: Re: executing gcc9 on macOS 10.14


Your ld command is incomplete. You aren't passing any of the runtime
libraries needed to link the .o file into an executable.

The simplest approach is to let gcc do the full job.

Titan ~/Documents/Code > cat test.f
        program hello
            print *, "Hello World!"
        end program hello
Titan ~/Documents/Code > gfortran-mp-9 -o test.exe ./test.f
Titan ~/Documents/Code > ./test.exe
   Hello World!

Titan ~/Documents/Code > otool -L ./test.exe
         /opt/local/lib/libgcc/libgfortran.5.dylib (compatibility version 6.0.0,
current version 6.0.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version 1252.200.5)
         /opt/local/lib/libgcc/libgcc_s.1.dylib (compatibility version 1.0.0,
current version 1.0.0)
         /opt/local/lib/libgcc/libquadmath.0.dylib (compatibility version 1.0.0,
current version 1.0.0)


On 22/10/2019 5:41 pm, Hans Goedbloed wrote:
I have been using g95 for my fortran codes for many years, but it did
not work anymore after upgrading to macOS 10.14 Mojave. I was advised to
install gccc9 from MacPorts instead. This I did through "sudo port
selfupdate" and "sudo port install gcc9".

This appeared to give all the required tools. When I then tried to
compile and execute the simplest fortran  program test.f (the usual just
writing of the message "Hello") by first compiling

/opt/local/bin/gfortran-mp-9 -v -c test.f

giving the required object file test.o, and then loading:

/opt/local/bin/ld -v test.o

this resulted in the messages

@(#)PROGRAM:ld PROJECT:ld64-512.4

BUILD 05:06:53 Aug 16 2019

configured to support archs: armv6 armv7 armv7s arm64 arm64e arm64_32
i386 x86_64 x86_64h armv6m armv7k armv7m armv7em

Library search paths:


Framework search paths:



Undefined symbols for architecture x86_64:

   "__gfortran_set_args", referenced from:

        _main in test.o

   "__gfortran_set_options", referenced from:

        _main in test.o

   "__gfortran_st_write", referenced from:

        _MAIN__ in test.o

   "__gfortran_st_write_done", referenced from:

        _MAIN__ in test.o

ld: symbol(s) not found for architecture x86_64

I thought installation of gcc9 would include everything. How should I
fix this?​


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