gcc10: dyld: Library not loaded: @rpath/libgfortran.5.dylib

[mdekauwe (Martin De Kauwe)]

Hi,

I have built gfortran fine (sudo port install gcc10 +gfortran) without errors. I have used it to successfully compile code; however, when it runs it complains:

dyld: Library not loaded: @rpath/libgfortran.5.dylib

As best I can tell, this relates to the path not being expanded at run time. If I check it...

$ otool -L  /opt/local/lib/libgcc/libgfortran.5.dylib
/opt/local/lib/libgcc/libgfortran.5.dylib:
	@rpath/libgfortran.5.dylib (compatibility version 6.0.0, current version 6.0.0)
	@rpath/libgcc_s.1.1.dylib (compatibility version 1.0.0, current version 1.1.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1292.100.5)

Any assistance would be greatly appreciated.

This is on a 2020 M1 MacBook if that affects anything.

[cjones051073 (Chris Jones)]

gcc10 is not really supported on Apple silicon. I suggest trying gcc-devel or gcc11 (although both also still have issues with M1 machines).

[mdekauwe (Martin De Kauwe)]

Thanks, I didn't realise that about gcc10 and the mac chips.

[cjones051073 (Chris Jones)]

The simple fact is there currently is no official release of gcc that supports apple silicon. Gcc11 has some patches that are supposed to work, but we have had issues with them. Gcc-devel has generally worked better but this is a rolling release, that builds gcc snapshots and thus changes regularly. It also uses different sources of intel and arm as currently the mainstream gcc snapshots still do not have support folded in, so we use a separate branch maintained by the primary gcc darwin lead. But still, it is never a proper prelease just a snapshot build so no guarantees i am afraid.

[cjones051073 (Chris Jones)]

Gcc10 has been updated with support for arm.