executing gcc9 on macOS 10.14

[Chris Jones]

Hi,

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
./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)

Chris

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:
> 
>            /usr/lib
> 
> Framework search paths:
> 
>            /Library/Frameworks/
> 
>            /System/Library/Frameworks/
> 
> 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?​
> 
> 
> Hans
> 
>