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Bug #11684

closed

Pack#unpack test failure on Solaris 10 with Oracle Solaris Studio 12.4

Added by ngoto (Naohisa Goto) over 8 years ago. Updated over 6 years ago.

Status:
Closed
Assignee:
ngoto (Naohisa Goto)
Target version:
-
ruby -v:
ruby 2.5.0dev (2017-12-19) [sparc64-solaris2.10]
Backport:
2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
[ruby-core:71485]

Description

On Solaris 10, when compiling ruby with Oracle Solaris Studio 12.4 with -xO4 optimization option, the following test failure is observed during make test-all. (tested with r52550)

  1) Failure:
TestPack#test_pack_unpack_atmark [XXXXX/test/ruby/test_pack.rb:548]:
<[nil]> expected but was
<[]>.

  2) Failure:
TestPack#test_short_string [/XXXXX/test/ruby/test_pack.rb:735]:
<[1, nil]> expected but was
<[1]>.

15885 tests, 2225854 assertions, 2 failures, 0 errors, 50 skips

It seems that String#unpack is incorrectly compiled with Oracle Solaris Studio 12.4 with -xO4.

$ irb
irb(main):001:0> [1,2].pack('i2')
=> "\x00\x00\x00\x01\x00\x00\x00\x02" ###<== OK
irb(main):002:0> "\x00\x00\x00\x01\x00\x00\x00\x02".unpack('i3')
=> [1, 2] ###<== [1, 2, nil] is expected

It seems that PACK_ITEM_ADJUST() is wiped out by wrong optimization.
I think this is a bug of Oracle Solaris Studio 12.4.

The failure is not observed with -xO3 or lower optimization option.
It is also not observed by using Oracle Solaris Studio 12.3, even speficying -xO4 optimization option.

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