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https://issues.apache.org/jira/browse/STDCXX-443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12548755
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Travis Vitek commented on STDCXX-443:
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I've done 12d builds [one with -O and the other with -O -Q]. The library is
smaller and executables are _usually_ smaller with just -O [as expected because
of less inlining]. Do we want to run some sort of performance benchmark to
decide what we should do, or do we just want to follow the documentation?
-O -O -Q File Name
1826061 1841108 libstd12d.so.4.2.0
31994 32286 search
39317 39281 set_diff
38813 38835 set_intr
39945 39909 set_sym_diff
39983 39947 set_union
60225 60459 setex
30370 30439 sieve
24177 24147 slice
27590 27856 slice_array
50960 52112 sort
77747 78013 spell
63653 63970 stack
24598 24620 stdexcept
84276 85530 stocks
33127 45083 stream_iterator
26953 27219 string
41160 41400 stringbuf
40945 41211 strstream
42568 42564 strstreambuf
32063 32360 swap
> [IBM XLC++] should avoid using -qinline or -Q in C++ code
> ---------------------------------------------------------
>
> Key: STDCXX-443
> URL: https://issues.apache.org/jira/browse/STDCXX-443
> Project: C++ Standard Library
> Issue Type: Improvement
> Components: Configuration
> Affects Versions: 4.1.3
> Environment: IBM VisualAge C++ 6.0, 7.0, and XLC++ 8.0
> Reporter: Martin Sebor
> Assignee: Travis Vitek
> Fix For: 4.2.1
>
>
> Quoting from the XLC++ 8.0 Compiler Reference, page 249 (-Q option):
> To maximize inlining:
> * for C programs, specify optimization (-O) and also specify the appropriate
> -Q options for the C language.
> * for C++ programs, specify optimization (-O) but do not specify the -Q
> option.
> We should review whether our use of -Q in optimized builds is called for.
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