llvm-3.9 @3.9.1: error: 'future_error' is unavailable: introduced in macOS 10.8

[cullub]

I originally got this error after running sudo port upgrade outdated. I then tried cleaning, uninstalling, and reinstalling (a few times), but got the same error each time it tried to build.

 $ sudo port upgrade outdated
--->  Computing dependencies for llvm-3.9
--->  Fetching distfiles for llvm-3.9
--->  Verifying checksums for llvm-3.9
--->  Extracting llvm-3.9
--->  Applying patches to llvm-3.9
--->  Configuring llvm-3.9
--->  Building llvm-3.9
Error: Failed to build llvm-3.9: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-3.9/llvm-3.9/main.log for details.
Error: Problem while installing llvm-3.9
Error: Follow https://guide.macports.org/#project.tickets to report a bug.

I attached the referenced /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-3.9/llvm-3.9/main.log

Some highlights:

:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-3.9/llvm-3.9/work/build" && /usr/bin/make -j4 -w all VERBOSE=ON 

(line 894)

Any ideas?

[cullub]

Log file for upgrading/installing llvm-3.9

[cullub]

Note: I'm on MacOS 10.12.3 (16D32). My macports.conf is as follows:

buildfromsource always
macosx_deployment_target 10.7
cxx_stdlib libc++

[cullub]

Update: If I remove the line macosx_deployment_target 10.7, it starts working.

Any ideas why this would be?

[kencu (Ken)]

See line 812.

You can delete that deployment target line....it will do you nothing good and may cause troubles like you have found now.

[jeremyhu (Jeremy Huddleston Sequoia)]

Yep. This is behaving correctly. future_error doesn't exist on Lion. If you want to use llvm-3.9, set your deployment target to 10.8 or higher.