GNU logs - #15646, boring messages

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Subject: bug#15646: Multiple bugs related to -no-undefined and -nostdlib
Resent-From: Andy Lutomirski <luto@HIDDEN>
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Resent-Date: Fri, 18 Oct 2013 17:27:01 +0000
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From: Andy Lutomirski <luto@HIDDEN>
Date: Fri, 18 Oct 2013 10:02:15 -0700
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Hi-

I recently played with the build system for capnproto
(http://kentonv.github.io/capnproto/), and I think I found at least
three bugs in libtool:

1. -no-undefined is completely broken on Linux (and probably almost
every other non-Windows system).  It should pass -Wl,--no-undefined to
gcc for the link stage when building shared libraries.  It doesn't.
(This appears to be 100% consistent and reproducible.)

When I sent in a patch to work around that (by adding
-Wl,--no-undefined explicitly), other things broke.  So far, I've
discovered:

2. When building a c++ shared library with -pthread, g++ gets called
with -nostdlib [1], and libtool forgets to add -lpthread.  This can be
reproduced on Fedora 19 if you build this and remove the -lpthread
addition:

https://github.com/kentonv/capnproto/commit/798ff87b1b7e0a2da96355a34fa6e0aa10aaae85

3. There are reports of -nostdlib getting used without -lc on Solaris.
 This also breaks if --no-undefined is fixed.

[1] I cannot fathom why libtool thinks that -nostdlib is a good idea,
but I have no intention of adding to that argument.  This bug is about
that fact that -nostdlib is used incorrectly.  It could be fixed
either by removing it or by adding the missing libraries that are
supposed to be implied.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Andy Lutomirski <luto@HIDDEN>
Subject: bug#15646: Acknowledgement (Multiple bugs related to
 -no-undefined and -nostdlib)
Message-ID: <handler.15646.B.138211718718098.ack <at> debbugs.gnu.org>
References: <CALCETrWe-r42UNiSx=KJMOBYqHBWojoCCfM7sz9yn8MA+6zrhw@HIDDEN>
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Date: Fri, 18 Oct 2013 17:27:02 +0000

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