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Date: Sat, 7 Feb 2009 17:20:02 -0600
Message-ID: <3b3f27c60902071520j651c9889ne50095fa7ecd4932@mail.gmail.com>
Subject: Re: [build] use.libstdc++6=true default?
From: Nathan Beyer <nbeyer@gmail.com>
To: dev@harmony.apache.org
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Isn't "/usr/lib/libstdc++.so.6" generally a symlink to the specific
version folder that's currently the default?

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.

-Nathan

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
>