From: "Alexander E. Patrakov" <patrakov@ums.usu.ru>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Overoptimization
Date: Fri, 28 May 2004 07:19:35 +0600 [thread overview]
Message-ID: <40B693A7.9050006@ums.usu.ru> (raw)
The CFLAGS in Makefile.target are bad for gcc 3.3.2. This is not a my
problem with my gcc, because it passes the "make check" testsuite except
some known errors in libstdc++, which cannot affect qemu.
The victim is the tcp_input function in slirp. When compiling with the
decault CFLAGS, for some reason all packets are dropped as having a
wrong TCP checksum. I tried debugging this by placing some debug printfs
in tcp_input.c file, but the problem disappeared after I inserted them.
I concluded that it is very strange and compiled this tcp_input.c file
without my debug statements, but with -O1 instead of -O2. The problem
went away.
Will this workaround (use of -O1 instead of -O2 for tcp_input.c) enter
the qemu CVS?
--
Alexander E. Patrakov
next reply other threads:[~2004-05-28 3:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-28 1:19 Alexander E. Patrakov [this message]
2004-05-28 10:13 ` [Qemu-devel] Overoptimization Herbert Poetzl
2004-05-28 10:58 ` Alexander E. Patrakov
2004-05-28 11:08 ` Herbert Poetzl
2004-05-28 13:50 ` [SOLVED] " Alexander E. Patrakov
2004-05-28 22:15 ` Lionel Ulmer
2004-05-29 18:18 ` [Qemu-devel] VNC patch, the 3rd version Johannes Schindelin
2004-05-31 2:00 ` Jim C. Brown
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