[MacPorts] #69245: p5.34-xml-parser: Expat must be installed prior to building XML::Parser and I can't find it

[MacPorts]

#69245: p5.34-xml-parser: Expat must be installed prior to building XML::Parser and
I can't find it
-------------------------------+--------------------
  Reporter:  ballapete         |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.9.0
Resolution:                    |   Keywords:  tiger
      Port:  p5.34-xml-parser  |
-------------------------------+--------------------
Changes (by ryandesign):

 * keywords:  tiger ppc => tiger


Comment:

 I am able to reproduce this problem on PowerPC Mac OS X 10.4.

 Replying to [comment:13 ballapete]:
 > Obviously the problem is that Perl does not read the passed arguments
 bur relies on environment variables. See here: https://github.com/cpan-
 authors/XML-Parser/issues/83.

 I have added enough debugging information to the build system to convince
 myself that the internal variables are set correctly regardless whether
 they are supplied as environment variables or as arguments.

 The GitHub issue you refer to is unrelated to your problem.

 Replying to [comment:16 ballapete]:
 > But then the question arises why this Homebrew guy also failed to
 install via configure arguments!

 There was no mention in that GitHub issue of a failure when using
 arguments, only a mention of success when using environment variables. I
 believe it would also have succeeded for them if they had used arguments.

 The problem appears to be that although the right paths are being given to
 the makefile, `check_lib` is failing to find the expat library. After
 adding further debugging commands (in inc/Devel/CheckLib.pm, I added the
 line `print join(" ", @sys_cmd) . "\n";` before the line `@sys_cmd;` in
 the `_compile_cmd` subroutine) I saw that the command it ran to try to
 find the expat library was:

 {{{
 /opt/local/bin/gcc-apple-4.2 -fno-common -DPERL_DARWIN -pipe -fno-strict-
 aliasing -I/opt/local/include -D_FORTIFY_SOURCE=2 -DPERL_USE_SAFE_PUTENV
 -I/opt/local/include assertlibjPIfroOE.c -L/opt/local/lib
 -Wl,-rpath,/opt/local/lib -lexpat -L/opt/local/lib -o assertlibDD5sItTr
 }}}

 Note the use of `-rpath`. Running this command manually (after changing
 `assertlibjPIfroOE.c` to a non-temporary valid C file) gave the
 unsurprising message:

 {{{
 ld: -rpath can only be used when targeting Mac OS X 10.5 or later
 collect2: ld returned 1 exit status
 }}}

 While this looks related to #71142, it's not; that issue doesn't affect
 perl5.34.

 Instead, this issue is caused by XML::Parser's bundled copy of
 Devel::CheckLib which uses `-rpath` on macOS. I've filed
 https://github.com/mattn/p5-Devel-CheckLib/issues/40 to ask them not to do
 that on Mac OS X 10.4 and earlier. Once that's fixed, we'd need to patch
 the bundled copy of Devel::CheckLib in XML::Parser until they can update
 their bundled copy.

-- 
Ticket URL: <https://trac.macports.org/ticket/69245#comment:17>
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