[MacPorts] #63645: building libqalculate @3.21.0 makes clang-10 @10.0.1_5 hit an assertion failure

MacPorts noreply at macports.org
Sat Nov 13 22:40:28 UTC 2021


#63645: building libqalculate @3.21.0 makes clang-10 @10.0.1_5 hit an assertion
failure
----------------------------------------------+--------------------
  Reporter:  cooljeanius                      |      Owner:  (none)
      Type:  defect                           |     Status:  new
  Priority:  Normal                           |  Milestone:
 Component:  ports                            |    Version:  2.7.1
Resolution:                                   |   Keywords:
      Port:  libqalculate, clang-10, llvm-10  |
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Comment (by iains):

 If GCC"s output is buggy - then sure we'd want to fix it.

 In this particular case, we emit:
 {{{
         .section __TEXT,__text_cold,regular,pure_instructions
 Letext_cold0:
 }}}
 but no content (this is a trailing symbol signifying the end of the
 section)

 The  ".section __TEXT,__text_cold,regular,pure_instructions"
 has been previously used (before any DWARF sections), so the section
 should be ordered before the __DWARF stuff in the mach-o .o file.

 So, in this specific case, AFAIU the intended operation of the assembler,
 this is a false positive.

 ----

 However, GCC does use other sections that are not "whitelisted" in static
 bool canGoAfterDWARF(const MCSectionMachO &MSec)  from
 lib/MC/MCMachOStreamer.cpp.  Some of these (e.g. the streamed LTO IR) can
 safely follow DWARF sections so perhaps we should reach some agreement on
 this and submit a patch to whitelist those.

 It also looks like mod_init/term_funcs sections are not whitelisted - and
 we definitely emit those late.
 I do have some initial patches somewhere to allow more control over the
 ordering - but they are not too high on the current TODO.

-- 
Ticket URL: <https://trac.macports.org/ticket/63645#comment:7>
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