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From Gregory Shimansky <gshiman...@apache.org>
Subject Re: [build] use.libstdc++6=true default?
Date Sat, 07 Feb 2009 23:43:33 GMT
On 8 February 2009 Nathan Beyer wrote:
> Isn't "/usr/lib/libstdc++.so.6" generally a symlink to the specific
> version folder that's currently the default?

Nope. It depends very much on the distro layout. The most likely place to find 
libc is /lib where you can execute (you can actually execute this 
lib) /lib/libc.so* and see the version.

> Regardless, moving to v6 as the default seems to make sense to me -
> this seems to be the default on the latest distribution releases that
> I've seen.

With this I agree. Version 6 has been the default for a time I can't remember 
and those who still use v5 might as well switch after all.

> On Sat, Feb 7, 2009 at 5:28 AM, Gregory Shimansky <gshimansky@apache.org> 
wrote:
> > On 7 February 2009 Mark Hindess wrote:
> >> Perhaps we should make use.libstdc++6=true the default?  Or maybe even
> >> try a little harder to make a better guess at the default with a patch
> >> like the one appended?
> >
> > Hmm it is not this easy. The library libstdc++ belongs to gcc, and its
> > location depends on gcc version (gcc may be even installed in a
> > non-standard location). Guessing it is not easy without configure script.
> > Here's what I get when I execute "locate libstdc++.so.6" on Gentoo Linux:
> >
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/3.4.6/32/libstdc++.so.6
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/3.4.6/32/libstdc++.so.6.0.3
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/3.4.6/libstdc++.so.6
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/3.4.6/libstdc++.so.6.0.3
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/4.1.2/32/libstdc++.so.6
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/4.1.2/32/libstdc++.so.6.0.8
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/4.1.2/libstdc++.so.6
> > /usr/lib64/gcc/x86_64-pc-linux-gnu/4.1.2/libstdc++.so.6.0.8
> >
> > The naming of path like "x86_64-pc-linux-gnu" is very platform dependent
> > as well.
> >
> > Someone might even want to use Intel compiler to build Harmony, I recall
> > icc used to work at some point of time and produced quite an optimized
> > code.
> >
> >> Index: working_classlib/make/properties.xml
> >> ===================================================================
> >> --- working_classlib/make/properties.xml        (revision 741852)
> >> +++ working_classlib/make/properties.xml        (working copy)
> >> @@ -313,6 +313,12 @@
> >>      </condition>
> >>      <property name="hy.portlib.stubs" value="false" />
> >>
> >> +    <condition property="use.libstdc++6" value="true">
> >> +        <and>
> >> +            <isset property="is.linux" />
> >> +            <available file="/usr/lib/libstdc++.so.6" type="file" />
> >> +        </and>
> >> +    </condition>
> >>      <condition property="hy.libstdc++.suffix" value=".libstdc++6">
> >>          <isset property="use.libstdc++6"/>
> >>      </condition>
> >> Index: common_resources/make/properties.xml
> >> ===================================================================
> >> --- common_resources/make/properties.xml        (revision 741852)
> >> +++ common_resources/make/properties.xml        (working copy)
> >> @@ -69,6 +69,12 @@
> >>      <property name="hy.test.timeout" value="900000" />
> >>      <property name="hy.test.vmargs" value="" />
> >>
> >> +    <condition property="use.libstdc++6" value="true">
> >> +        <and>
> >> +            <isset property="is.linux" />
> >> +            <available file="/usr/lib/libstdc++.so.6" type="file" />
> >> +        </and>
> >> +    </condition>
> >>      <condition property="hy.platform.suffix" value=".libstdc++6">
> >>          <isset property="use.libstdc++6"/>
> >>      </condition>
> >
> > --
> > Gregory
-- 
Gregory

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