Problem downloading GMP using MacPorts, need advice

[Jay Freeman]

I am trying to download GMP via MacPorts; I am a stranger to both, and am having a problem. I thought I would ask about it here first, though of course it may be a problem with my use of MacPorts, but the problem seems at first sight to be a dependency required by the GMP download itself.

I am running MacOS 11.6.5 (Big Sur) on a 2019 Mac Pro with Intel hardware. I have Xcode 13.2.1 installed, and have installed the associated command-line tools. I downloaded the MacPorts distribution for Big Sur and ran an apparently clean install via the installer. After some searching, I tried: "sudo port install gmp" and got the following:

#### SNIP ####

> sudo port install gmp                             
Password:
--->  Cleaning gmp
--->  Scanning binaries for linking errors
--->  Found 12 broken files, matching files to ports
Warning: No port llvm-3.0 found in the index; can't rebuild
--->  Found 1 broken port, determining rebuild order
You can always run 'port rev-upgrade' again to fix errors.
The following ports will be rebuilt: gcc46 @4.6.3
Continue? [Y/n]: Y 
--->  Fetching distfiles for gcc46
Error: building gcc46 is not supported with Xcode 9 or greater
Error: Failed to fetch gcc46: unsupported platform
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc46/gcc46/main.log for details.
Error: rev-upgrade failed: Error rebuilding gcc46
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.

#### UNSNIP ####



The log file cited gives a long trace of what happened, but the ultimate error is indeed

    :error:fetch building gcc46 is not supported with Xcode 9 or greater
    :error:fetch Failed to fetch gcc46: unsupported platform

The advice in the first snipped output, to run "port rev-upgrade" isn't very useful:

#### SNIP ####

> sudo port rev-upgrade
Password:
--->  Scanning binaries for linking errors
--->  Found 12 broken files, matching files to ports
Warning: No port llvm-3.0 found in the index; can't rebuild
--->  Found 1 broken port, determining rebuild order
You can always run 'port rev-upgrade' again to fix errors.
The following ports will be rebuilt: gcc46 @4.6.3
Continue? [Y/n]: Y
--->  Fetching distfiles for gcc46
Error: building gcc46 is not supported with Xcode 9 or greater
Error: Failed to fetch gcc46: unsupported platform
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc46/gcc46/main.log for details.
Error: rev-upgrade failed: Error rebuilding gcc46
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.

#### UNSNIP ####



I learned a little more about what is actually installed:

#### SNIP ####

> port installed gcc46
The following ports are currently installed:
  gcc46 @4.6.3_3 (active)

#### UNSNIP ####


Any advice? If you folks think this is a MacPorts issue, I will try them next.

Thanks.


--  Jay Reynolds Freeman
---------------------
Jay_Reynolds_Freeman at mac.com
http://JayReynoldsFreeman.com (personal web site)