GitX: error: garbage collection is no longer supported

[vulcan_@…]

on this machine

Model Name:	Mac mini
  Model Identifier:	Macmini5,1
  Processor Name:	Intel Core i5
  Processor Speed:	2.3 GHz
  Number of Processors:	1
  Total Number of Cores:	2
  L2 Cache (per Core):	256 KB
  L3 Cache:	3 MB
  Memory:	8 GB

i try this command

bash-3.2# port clean --all  gitx
--->  Cleaning GitX
bash-3.2# port -v install gitx

with this sad result (trimmed)

--->  Building GitX
Build settings from command line:
    ARCHS = x86_64
    CLANG_CXX_LIBRARY = libc++
    GCC_VERSION = com.apple.compilers.llvm.clang.1_0
    MACOSX_DEPLOYMENT_TARGET = 10.9
    OBJROOT = build/
    SDKROOT =
    SYMROOT = build/

<<patches are applied>>

2015-01-19 10:39:12.743 xcodebuild[36749:f07] warning:  The file reference for "PBCommitList.h" is a member of multiple groups ("Aux" and "History"); this indicates a malformed project.  Only the membership in one of the groups will be preserved (but membership in targets will be unaffected).  If you want a reference to the same file in more than one group, please add another reference to the same path.
2015-01-19 10:39:12.744 xcodebuild[36749:f07] warning:  The file reference for "PBCommitList.m" is a member of multiple groups ("Aux" and "History"); this indicates a malformed project.  Only the membership in one of the groups will be preserved (but membership in targets will be unaffected).  If you want a reference to the same file in more than one group, please add another reference to the same path.
=== BUILD TARGET cli tool OF PROJECT GitX WITH CONFIGURATION Release ===

<more stuff happens>

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c -arch x86_64 .. x86_64/PBEasyPipe.o
error: garbage collection is no longer supported

< same again for gitx.o and PBGitBinary.o>

Command failed: cd "/Volumes/opt/opt/local/var/macports/build/_Volumes_opt_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_GitX/GitX/work/gitx-0.7.1" && /usr/bin/xcodebuild  -target "GitX" -configuration Release build OBJROOT=build/ SYMROOT=build/ MACOSX_DEPLOYMENT_TARGET=10.9 ARCHS=x86_64 SDKROOT="" GCC_VERSION=com.apple.compilers.llvm.clang.1_0 CLANG_CXX_LIBRARY="libc++"

i see from ticket #40924 of 15 months ago that the build command for GitX was changed to use libstdc++ to solve a similar problem .. but in my verbose build is see that libc++ is being used.

[vulcan_@…]

main log file from GitX build

[ryandesign (Ryan Carsten Schmidt)]

Replying to vulcan_@…:

error: garbage collection is no longer supported

The error message is correct. Garbage collection is not supported in Xcode 5 and later.

GitX is obsolete. See #42957 about a potential replacement.

[neverpanic (Clemens Lang)]

This won't get fixed other than by switching to GitX-dev as outlined in #42957.