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https://issues.apache.org/jira/browse/STDCXX-740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Farid Zaripov closed STDCXX-740.
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Merged in 4.2.x branch thus:
http://svn.apache.org/viewvc?view=rev&revision=648752
> INFINITY config test outputs the different _RWSTD_LDBL_SNAN_BITS values per
> different runs
> ------------------------------------------------------------------------------------------
>
> Key: STDCXX-740
> URL: https://issues.apache.org/jira/browse/STDCXX-740
> Project: C++ Standard Library
> Issue Type: Bug
> Components: Configuration
> Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
> Environment: gcc/Linux/i386
> Reporter: Farid Zaripov
> Assignee: Farid Zaripov
> Priority: Trivial
> Fix For: 4.2.1
>
> Attachments: INFINITY.cpp.diff
>
> Original Estimate: 1h
> Time Spent: 1h
> Remaining Estimate: 0h
>
> When I ran the INFINITY config test several times I found that the
> _RWSTD_LDBL_SNAN_BITS values are different from time to time.
> Below is the result of 5 runs of the INFINITY test:
> {noformat}
> #define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
> '\x7f', '\xf9', '\xbf' }
> #define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
> '\x7f', '\xfd', '\xbf' }
> #define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
> '\x7f', '\xf7', '\xbf' }
> #define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
> '\x7f', '\xf2', '\xbf' }
> #define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
> '\x7f', '\xe8', '\xbf' }
> {noformat}
> I suppose that actually used 80 bits from 96 bits of long double (sizeof
> (long double) == 12) and the latest two bytes contains the garbage from stack.
> I think we need fill by zero values the bits fields of the flt_bits, dbl_bits
> and ldbl_bits unions (i.e. in union ctor).
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