[MacPorts] #64316: gcc9 @9.4.0_1 & gcc10 @10.3.0_1: build failure: Undefined symbols for architecture x86_64

[MacPorts]

#64316: gcc9 @9.4.0_1 & gcc10 @10.3.0_1: build failure: Undefined symbols for
architecture x86_64
-------------------------+--------------------
  Reporter:  i0ntempest  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:  gcc9 gcc10  |
-------------------------+--------------------

Comment (by cmstuber):

 I've been having this issue as well since about the time this ticket was
 submitted.

 From a clean macports install and having buildfromsource turned on, I
 attempted to build gcc9 first.  libgcc10 builds successfully but libgcc9
 does not, thus gcc9 will fail to build.

 {{{
 --->  Fetching distfiles for libgcc10
 --->  Verifying checksums for libgcc10
 --->  Extracting libgcc10
 --->  Configuring libgcc10
 --->  Building libgcc10
 --->  Staging libgcc10 into destroot
 --->  Installing libgcc10 @10.3.0_2
 --->  Activating libgcc10 @10.3.0_2
 --->  Cleaning libgcc10
 --->  Fetching distfiles for libgcc9
 --->  Attempting to fetch gcc-9.4.0.tar.xz from
 https://distfiles.macports.org/gcc9
 --->  Verifying checksums for libgcc9
 --->  Extracting libgcc9
 --->  Applying patches to libgcc9
 --->  Configuring libgcc9
 Warning: Applying '--without-build-config' workaround to Xcode 13.2.1 /
 CLT 13.2.0.0.1.1637719136
 Warning: If versions > 12.5 please check if it is still required
 --->  Building libgcc9
 Error: Failed to build libgcc9: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_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.
 Error: Processing of port gcc9 failed
 }}}

 Without cleanup, I attempted to build gcc10 but got an immediate failure.

 {{{
 root at mac66 local # port install gcc10
 --->  Computing dependencies for gcc10
 --->  Building gcc10
 Error: Failed to build gcc10: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there is a bug.
 Error: Processing of port gcc10 failed
 root at mac66 local #
 }}}

 Attaching terminal input/output, main.logs from libgcc9, gcc9, gcc10.

-- 
Ticket URL: <https://trac.macports.org/ticket/64316#comment:5>
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