Tach auch! Am Mo, den 10 April 2006, schrieb Gabriel Paubert: > On Sun, Apr 09, 2006 at 02:45:04PM +0200, Dieter Schuster wrote: > > Am Fr, den 31 März 2006, schrieb Alan Modra: > > > On Tue, Mar 28, 2006 at 12:00:47PM +0200, Gabriel Paubert wrote: > > > > On Tue, Mar 28, 2006 at 12:56:13AM +0200, Dieter Schuster wrote: > > > > > If I try to compile qemu with GCC 3.4 without the patch I get the following error: > > > > > > > > > > qemu-0.8.0/linux-user/elfload.c: In function `load_elf_binary': > > > > > qemu-0.8.0/cpu-all.h:253: error: inconsistent operand constraints in an `asm' > > > > > qemu-0.8.0/cpu-all.h:253: error: inconsistent operand constraints in an `asm' [...] > > > > I had now more time, to investigate the error. It seems to be a > > optimization problem. With -O2 -fno-gcse the error disappeared. I have > > made a bug report to gcc. > > Yes, but you sent it to gnats-gcc, which is completely obsolete. You > should use bugzilla. Now the testcase looks really minimal: I use gccbug and thought it knows how to report a bug. Should I report it again to bugzilla? > http://lists.debian.org/debian-gcc/2006/04/msg00135.html > > even if the code looks strange (redundant cast, if without > braces which confused me at first). This may be the result > of normal macro expansion. Yes, it is a macro expansion, it is extracted from qemu, where the error appeared. > However, I believe that the most serious problem is that you > use uninitialized local variables (which makes the code invalid). Yes, but the code should also compile with the uninitialized local variables, so I does not care about it. > Testing here with recent Debian versions of gcc-3.4, 4.0 and 4.1 > show that I can' trigger any problem with 4.0 and 4.1, and that Same here. With 3.3 there is any problem, too. It seems it is a bug just in 3.4. > for gcc-3.4: > - -O1 always works (regardless of -fgcse), which is surprising > since I have exactly the same compiler as you. The new test case works for me with -O1, too. The old one not. > - -O2 -fno-gcse works > - -O2 (implies -fgcse) fails The same here. Greetings, Dieter Schuster -- GnuPG Key-ID: 1024D/5EE6EF26, bitte verschlüsselte E-Post; keine HTML-Post. Keine Logik-/Softwarepatente. Pas de Brevets Logique/Logiciels. No Logic/Software Patents.
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