Bug 42847 - [4.5 Regression] failure while configuring libstdc++
Summary: [4.5 Regression] failure while configuring libstdc++
Status: RESOLVED INVALID
Alias: None
Product: gcc
Classification: Unclassified
Component: libstdc++ (show other bugs)
Version: 4.5.0
: P3 normal
Target Milestone: ---
Assignee: Not yet assigned to anyone
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-01-22 16:17 UTC by Rainer Emrich
Modified: 2010-02-01 21:46 UTC (History)
4 users (show)

See Also:
Host: x86_64-unknown-linux-gnu
Target: i686-pc-cygwin
Build: x86_64-unknown-linux-gnu
Known to work: 4.4.2 4.4.3
Known to fail:
Last reconfirmed:

Attachments
libstdc++ config.log (15.54 KB, text/x-log)
2010-01-22 16:18 UTC, Rainer Emrich 		Details
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Description Rainer Emrich 2010-01-22 16:17:45 UTC 
configuring libstdc++ fails:
error: No support for this host/target combination

This is a regression at least against gcc-4.4.
I'm not really sure, but I think sometime last year this even worked for gcc-4.5.0.

Rainer
Comment 1 Rainer Emrich 2010-01-22 16:18:46 UTC 
Created attachment 19695 [details]
libstdc++ config.log
Comment 2 Paolo Carlini 2010-01-22 18:51:06 UTC 
I'm adding in CC some cygwin experts, hopefully they will be able to help you...
Comment 3 Dave Korn 2010-01-22 19:25:31 UTC 
I haven't tried a whole lot of cross compiler building.  There's no reference to cygwin anywhere in crossconfig.m4, so perhaps we need --with-newlib?
Comment 4 Rainer Emrich 2010-01-22 20:16:22 UTC 
(In reply to comment #3)
> I haven't tried a whole lot of cross compiler building.  There's no reference
> to cygwin anywhere in crossconfig.m4, so perhaps we need --with-newlib?
> 

The identical setup works for gcc-4.4.2 and gcc-4.4.3

I'm a little bit short on time at the moment, but I try to dig into it further.
To find the change that caused the different behavior probably will help.
Comment 5 Rainer Emrich 2010-02-01 21:46:45 UTC 
(In reply to comment #3)
> I haven't tried a whole lot of cross compiler building.  There's no reference
> to cygwin anywhere in crossconfig.m4, so perhaps we need --with-newlib?
> 

Sorry guys, my fault. Indeed I missed --with-newlib.
So, closing as invalid.

Rainer