[MacPorts] #64990: itpp @4.3.1: version:1:1: error: expected unqualified-id (was: itpp-4.3.1_0+accelerate+docs.darwin_21.x86_64: Failed to build itpp: command execution failed)

[MacPorts]

#64990: itpp @4.3.1: version:1:1: error: expected unqualified-id
---------------------+--------------------
  Reporter:  tkeep   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.7.2
Resolution:          |   Keywords:
      Port:  itpp    |
---------------------+--------------------
Changes (by ryandesign):

 * priority:  High => Normal


Old description:

> Fail to install itpp on Big Sur. I've tried a clean install, and even
> starting again with MacPorts from scratch, installing itpp before
> anything else.
>
> This is an exert from the main.log file. Any help would be most
> appreciated.
>
> :info:build [ 13%] Built target itpp_doc
> :info:build make[1]: Leaving directory
> `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_itpp/itpp/work/build'
> :info:build make: *** [all] Error 2
> :info:build make: Leaving directory
> `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_itpp/itpp/work/build'
> :info:build Command failed:  cd
> "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_itpp/itpp/work/build"
> && /usr/bin/make -j16 -w all VERBOSE=ON
> :info:build Exit code: 2
> :error:build Failed to build itpp: command execution failed
> :debug:build Error code: CHILDSTATUS 14091 2
> :debug:build Backtrace: command execution failed
> :debug:build     while executing
> :debug:build "system {*}$notty {*}$callback {*}$nice $fullcmdstring"
> :debug:build     invoked from within
> :debug:build "command_exec -callback
> portprogress::target_progress_callback build"
> :debug:build     (procedure "portbuild::build_main" line 8)
> :debug:build     invoked from within
> :debug:build "$procedure $targetname"

New description:

 Fail to install itpp on Big Sur. I've tried a clean install, and even
 starting again with MacPorts from scratch, installing itpp before anything
 else.

 This is an exert from the main.log file. Any help would be most
 appreciated.

 {{{
 :info:build [ 13%] Built target itpp_doc
 :info:build make[1]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_itpp/itpp/work/build'
 :info:build make: *** [all] Error 2
 :info:build make: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_itpp/itpp/work/build'
 :info:build Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_math_itpp/itpp/work/build"
 && /usr/bin/make -j16 -w all VERBOSE=ON
 :info:build Exit code: 2
 :error:build Failed to build itpp: command execution failed
 :debug:build Error code: CHILDSTATUS 14091 2
 :debug:build Backtrace: command execution failed
 :debug:build     while executing
 :debug:build "system {*}$notty {*}$callback {*}$nice $fullcmdstring"
 :debug:build     invoked from within
 :debug:build "command_exec -callback
 portprogress::target_progress_callback build"
 :debug:build     (procedure "portbuild::build_main" line 8)
 :debug:build     invoked from within
 :debug:build "$procedure $targetname"
 }}}

--

Comment:

 The log shows the error is:

 {{{
 version:1:1: error: expected unqualified-id
 }}}

 This is a well-known problem resulting from the collision of the project's
 VERSION text file with the <version> header in C++20-compatible compilers
 on case-insensitive filesystems. The solution is for the project not to
 add a `-I` flag for the directory that contains the VERSION file or,
 failing that, renaming the VERSION file to something else, such as
 VERSION.txt.

 This is not a MacPorts- nor macOS-specific problem (though is more
 prevalent on macOS since Macs usually use a case-insensitive filesystem
 while other UNIX systems usually do not) and should be
 [https://sourceforge.net/p/itpp/bugs/ reported to the developers of itpp].
 However itpp seems to be rather dormant so we may have to work on a fix
 for this ourselves.

-- 
Ticket URL: <https://trac.macports.org/ticket/64990#comment:1>
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