libgcc9 @9.4.0: Error: No files have been installed in the destroot directory!

[RobK88]

I am unable to upgrade libgcc9 on my old Mac running Lion. The upgrade fails when trying to stage libgcc9 into destroot.

bash-3.2$ port outdated
The following installed ports are outdated:
libgcc9                        9.3.0_3 < 9.4.0_0         

bash-3.2$ sudo port upgrade outdated
--->  Computing dependencies for libgcc9
--->  Fetching distfiles for libgcc9
--->  Attempting to fetch gcc-9.4.0.tar.xz from http://distfiles.macports.org/gcc9
--->  Verifying checksums for libgcc9                                                
--->  Extracting libgcc9
--->  Applying patches to libgcc9
--->  Configuring libgcc9
--->  Building libgcc9                                   
--->  Staging libgcc9 into destroot                      
Error: No files have been installed in the destroot directory!
Error: Please make sure that this software supports 'make install DESTDIR=${destroot}' or implement an alternative destroot mechanism in the Portfile.
Error: Files might have been installed directly into your system, check before proceeding.
Error: Failed to destroot libgcc9: Staging libgcc9 into destroot failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc9/libgcc9/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
bash-3.2$

[RobK88]

Last part of main.log

[rmottola (Riccardo)]

I think this could be a duplicate of 63018 ?

[RobK88]

I do not think it is a dup of 63018. I can build libgcc9 on my Mac running 10.7.5. But I cannot install the files into destroot.

[kencu (Ken)]

The issue is that libgcc9 on 10.7.5 doesn't install any files, so the destroot is empty and MacPorts flags it as failing. Once that is tweaked, no problemo:

$ port -v installed gcc9
The following ports are currently installed:
  gcc9 @9.4.0_0 (active) requested_variants='' platform='darwin 11' archs='x86_64' date='2021-06-10T05:09:41-0700'

I'll fix this up shortly.

[ken-cunningham-webuse]

In 10bdaa73a75a5d5a0c591a839c0258505d031d29/macports-ports (master):

libgcc9: stub port on < darwin12

libgcc9 supplies libasan.5.dylib only on darwin12+
closes: #63018
closes: #63016

[RobK88]

Thanks Ken for all your hard work.

But when I try to upgrade libgcc9, the port is installed within seconds! Normally, it takes some to to compile!

bash-3.2$ sudo port clean libgcc9
--->  Cleaning libgcc9
bash-3.2$ 
bash-3.2$ port outdated
The following installed ports are outdated:
libgcc9                        9.3.0_3 < 9.4.0_0  
bash-3.2$        
bash-3.2$ sudo port upgrade outdated
--->  Computing dependencies for libgcc9
--->  Fetching distfiles for libgcc9
--->  Verifying checksums for libgcc9
--->  Extracting libgcc9
--->  Configuring libgcc9
--->  Building libgcc9
--->  Staging libgcc9 into destroot
--->  Installing libgcc9 @9.4.0_0
--->  Cleaning libgcc9
--->  Computing dependencies for libgcc9
--->  Deactivating libgcc9 @9.3.0_3
--->  Cleaning libgcc9
--->  Activating libgcc9 @9.4.0_0
--->  Cleaning libgcc9
--->  Scanning binaries for linking errors
--->  No broken files found.                             
--->  No broken ports found.
bash-3.2$ 
bash-3.2$ port contents libgcc9
Port libgcc9 contains:
  /opt/local/share/doc/libgcc9/README
bash-3.2$ 

[kencu (Ken)]

It's OK. libgcc9 is a stub port now on < 10.8, and doesn't install any libraries.

But it has to install something, otherwise you get:

Error: No files have been installed in the destroot directory!

So now it installs a silly little readme saying it hasn't installed anything.

Call it a MacPorts idiosyncracy -- it's just the way things work. It is too hard to do it differently, and have libgcc9 not install anything at all.

[RobK88]

Ken -- Many thanks for the explanation.

I checked ggc9 and it appears to run just fine.

bash-3.2$ port installed gcc9
The following ports are currently installed:
  gcc9 @9.4.0_0 (active)

bash-3.2$ c++-mp-9 --version
c++-mp-9 (MacPorts gcc9 9.4.0_0) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.