When compiling using clang (2.9 or lower) do not enable
-Wnormalized=id or -Woverride-init when --enable-gcc-warnings
or --enable-gcc-warnings-advisory is set as these options
are unsupported.
This commit is based on a patch for Tor
(git commit 56bdc844ba68ac0911efc7ad3398f1eafeaaac76 by Steven
Murdoch), Copyright (c) 2007-2011, The Tor Project, Inc.
This patch fixes http://bugs.ntp.org/1844, works around
http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=40401, by
improving the test for support of --gc-sections to run a program which
reads a file using stdio built with --gc-sections, instead of simply
link the binary. This catches the buggy linker as the garbage
collection removes a tag NetBSD uses to distinguish its own elf
binaries from Linux ones, causing it to treat conftest as a Linux
binary and run it with the wrong syscall table.
I don't see how this can burn anybody, but I don't want to take
chances: new build options are something that should be done in an
alpha. To turn -ffunction-sections on, pass
--enable-function-sections to configure.
The main reason for disabling installation is if you're building
libevent as a subpackage for embedding: you want to have your main
package's "make all" build libevent, but you don't want your main
package's "make install" to install libevent.
When pthread_t was smaller, our calculated thread IDs would include
uninitialized RAM, and so our unit tests would fail because thread_ids
would never match one another.
When pthread_t was larger and alignment was big-endian, our calculated
thread IDs would only have the most significant bytes of the
pthread_t, when in practice all the entropy is in the low-order bytes.
Found with help from Dagobert Michelsen.
NOTE: This is not the official release until I tag it. If you see
this commit, and you decide that Libevent 2.0.8-rc is now
finalized, you might get something besides 2.0.8-rc.
Apparently, in our configure.in check for a working kqueue, we were
leaving some fields unset that seemed to irritate 64-bit kqueue a lot.
Found by Christopher Layne
