libgcc7 @7.5.0 build failure on macOS 11

[wealthychef1]

rcook@Richards-iMac (tmp ): xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
rcook@Richards-iMac (tmp ): sudo touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
Password:
Sorry, try again.
Password:
rcook@Richards-iMac (tmp ): sudo -s
xauth: (argv):1:  key contains odd number of or non-hex characters
root@Richards-iMac (~ ): softwareupdate -l
Software Update Tool


Finding available software
Software Update found the following new or updated software:
* Label: Command Line Tools for Xcode-12.4
    Title: Command Line Tools for Xcode, Version: 12.4, Size: 440392K, Recommended: YES, 
root@Richards-iMac (~ ): softwareupdate -i 'Command Line Tools for Xcode-12.4'. # use LABEL, not TITLE!!!
Software Update Tool


Finding available software


Downloading Command Line Tools for Xcode
Downloaded Command Line Tools for Xcode
Installing Command Line Tools for Xcode
Done with Command Line Tools for Xcode
Done.
root@Richards-iMac (~ ): xcodebuild -license
Xcode and Apple SDKs Agreement
... blah blah root@Richards-iMac (~ ): port install pdftk
Warning: The macOS 11.2 SDK does not appear to be installed. Ports may not build correctly.
Warning: You can install it as part of the Xcode Command Line Tools package by running `xcode-select --install'.
--->  Computing dependencies for pdftk
The following dependencies will be installed: 
 gcc5
 libgcc6
 libgcc7
Continue? [Y/n]: n
--->  Scanning binaries for linking errors
--->  No broken files found.                             
--->  No broken ports found.
root@Richards-iMac (~ ): port install pdftk
Warning: The macOS 11.2 SDK does not appear to be installed. Ports may not build correctly.
Warning: You can install it as part of the Xcode Command Line Tools package by running `xcode-select --install'.
--->  Computing dependencies for pdftk
The following dependencies will be installed: 
 gcc5
 libgcc6
 libgcc7
Continue? [Y/n]: 
Warning: The macOS 11.2 SDK does not appear to be installed. Ports may not build correctly.
Warning: You can install it as part of the Xcode Command Line Tools package by running `xcode-select --install'.


--->  Fetching archive for libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from http://jog.id.packages.macports.org/macports/packages/libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from https://kmq.jp.packages.macports.org/libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from https://pek.cn.packages.macports.org/macports/packages/libgcc7
--->  Building libgcc7
Error: Failed to build libgcc7: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port pdftk failed
root@Richards-iMac (~ ): 

Here is the tail of the referenced log file:

:info:build libtool: link:  /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/./gcc/xgcc -shared-libgcc -B/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/./gcc -nostdinc++ -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src/.libs -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/libsupc++/.libs -B/opt/local/x86_64-apple-darwin20/bin/ -B/opt/local/x86_64-apple-darwin20/lib/ -isystem /opt/local/x86_64-apple-darwin20/include -isystem /opt/local/x86_64-apple-darwin20/sys-include    -dynamiclib  -o .libs/libstdc++.6.dylib .libs/libstdc++.6.dylib-master.o  -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/libsupc++/.libs -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src/.libs -lm  -Wl,-exported_symbols_list -Wl,libstdc++-symbols.explist   -install_name  /opt/local/lib/libgcc/libstdc++.6.dylib -compatibility_version 7 -current_version 7.24
:info:build xgcc: warning: couldn't understand version 11.2
:info:build ld: library not found for -lgcc_s.10.4
:info:build collect2: error: ld returned 1 exit status
:info:build make[6]: *** [libstdc++.la] Error 1
:info:build make[6]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src'
:info:build make[5]: *** [all-recursive] Error 1
:info:build make[5]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src'
:info:build make[4]: *** [all-recursive] Error 1
:info:build make[4]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3'
:info:build make[3]: *** [all] Error 2
:info:build make[3]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3'
:info:build make[2]: *** [all-stage1-target-libstdc++-v3] Error 2
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build'
:info:build make[1]: *** [stage1-bubble] Error 2
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build'
:info:build make: *** [bootstrap-lean] Error 2
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build" && /usr/bin/make -j4 -w bootstrap-lean 
:info:build Exit code: 2
:error:build Failed to build libgcc7: command execution failed
:debug:build Error code: CHILDSTATUS 68953 2
:debug:build Backtrace: command execution failed
:debug:build     while executing
:debug:build "system {*}$notty {*}$nice $fullcmdstring"
:debug:build     invoked from within
:debug:build "command_exec build"
:debug:build     (procedure "portbuild::build_main" line 8)
:debug:build     invoked from within
:debug:build "$procedure $targetname"
:error:build See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/main.log for details.

[wealthychef1]

corrected port

[jmroot (Joshua Root)]

#61883