Re: gfortran static linking under OS X (was: Re: )

[Iain Sandoe <idsandoe@googlemail.com>]

Daniel Feenberg <feenberg@gmail.com> wrote:

> On 3/19/21, Iain Sandoe <idsandoe@googlemail.com> wrote:
>
>>> On Fri, 19 Mar 2021, Tobias Burnus wrote:
>
>> you should be able to work around this without changing the compiler or
>> rebuilding it,

>> %rename lib liborig
>> *lib:  -lquadmath -lm %(libgcc) %(liborig)
>>
>> change the last line line to :
>>
>> *lib: %{!static-libgfortran: -lquadmath } %{static-libgfortran:
>> libquadmath.a%s} %(libgcc) %(liborig)

^^ this line is presumably not broken in your file - i.e. this is a mailer
phenomenon?

>> ===
>>
>> and try your link again
>
> Tried that, the error message is:
>
>   ld: library not found for -lSystem

Please could you either file a PR or send the output of

/your complete command line/ with ‘-save-temps -v’ appended

to me off-list.

----

For the record, this was not completely theoretical on my part; I actually  
tried this on a macOS 11.2.3 system with gcc-6.5 (which is the closest I  
have to what you’re using)

…./gcc-6-5/bin/gfortran /source/test/fortran/hello.f -static-libgfortran  
-static-libgcc -o h

$  otool -Lv h
h:
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1292.60.1)
	time stamp 2 Thu Jan  1 01:00:02 1970

This ^^ is what I expect to see;
libgfortran, libquadmath and libgcc have all been linked statically,  
leaving only
the "/usr/lib/libSystem.B.dylib” which is fine and expected.

> Indeed there is no libsystem.a anywhere on the computer.

macOS does not allow the equivalent of a “completely statically linked”  
user-mode
executable.  Exes are always started by “dyld” (dynamic linker) and they  
always refer
to libSystem.dylib.

So you should never be needing to find a libSystem.a (there isn’t one, as  
you found).
Nor do you need to care about it - since it’s available to all your  
end-users as part
of their system (as are things like the Accelerate framework).

> Any ideas?

I am somewhat surprised that 6.3 behaves any differently from 6.5 - let’s  
investigate a little more.

cheers
Iain