[MacPorts] #36026: ld64 sometimes builds wrong which causes other software to fail to build

[MacPorts]

#36026: ld64 sometimes builds wrong which causes other software to fail to build
-------------------------+------------------------
  Reporter:  jwhowse4@…  |      Owner:  jeremyhu@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.1.2
Resolution:              |   Keywords:
      Port:  ld64        |
-------------------------+------------------------

Comment (by jeremyhu@…):

 Replying to [comment:94 vaccari@…]:
 > I can well be mistaken, as I'm no expert here, but I thought the output
 of command
 >
 > {{{
 > sudo clang -E .... -o _muldi3_s.o ...
 > }}}

 Right, but we don't care about muldi3_s.o.  It's not part of ld64.  You're
 just seeing it in your error messages because ld is trying to link that
 file, but ld is the problem, not muldi3_s.o.


 Replying to [comment:95 vaccari@…]:
 > So, I'm now trying to produce the preprocessed code for
 macho_relocatable_file.cpp
 >
 > Found it in
 >
 > {{{
 >
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_ld64/ld64/work/ld64-133.3/src/ld/parsers
 > }}}
 >
 > cd there and tried
 >
 > {{{
 > sudo clang -E -I. -I../../ld -I../../abstraction
 macho_relocatable_file.cpp -o macho_relocatable_file.cpp.preprocessed
 > }}}
 >
 > But got error
 >
 >
 > {{{
 > In file included from macho_relocatable_file.cpp:35:
 > ../../abstraction/MachOFileAbstraction.hpp:290:10: fatal error:
 >       'mach-o/arm/reloc.h' file not found
 > #include <mach-o/arm/reloc.h>
 > }}}
 >
 > I can only guess some needed configuration is missing when trying
 ''clang -E'' straight from the command line.
 >
 > I'm willing to help here, but don't want to waste your time either,
 given I'm quite ignorant on this matter...

 Look at the build log for ld64 and just replace the '-c -o <output file>'
 with '-E -o <where you want to store the preprocessed source>' ... Please
 don't try to figure out a build line on your own because there is
 something *very particular* going on here, and you need to present me with
 the exact preprocessed source, not just *any* preprocessed source.

 In my log, I see:
 {{{
 /usr/bin/clang++ -Os -O2 -arch x86_64
 -I/opt/local/libexec/llvm-3.1/include -DLTO_SUPPORT -Isrc/abstraction
 -Isrc/ld -Isrc/ld/parsers -I/opt/local/include  -c -o
 src/ld/parsers/macho_relocatable_file.o
 src/ld/parsers/macho_relocatable_file.cpp
 }}}

 So I would do:
 {{{
 /usr/bin/clang++ -Os -O2 -arch x86_64
 -I/opt/local/libexec/llvm-3.1/include -DLTO_SUPPORT -Isrc/abstraction
 -Isrc/ld -Isrc/ld/parsers -I/opt/local/include  -E -o
 ~/Desktop/macho_relocatable_file.preprocessed.cpp
 src/ld/parsers/macho_relocatable_file.cpp
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/36026#comment:96>
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