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From Nathan Beyer <ndbe...@apache.org>
Subject Re: [build] use.libstdc++6=true default?
Date Mon, 09 Feb 2009 03:05:18 GMT
Any objections to setting this 'true' by default? It seems we have
three people okay with it. If none are brought up, I or anyone can
switch it.

-Nathan

On Sat, Feb 7, 2009 at 5:43 PM, Gregory Shimansky <gshimansky@apache.org> wrote:
> 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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