Re: FAIL: gcc.c-torture/compile/20000804-1.c -O0 with PIC on gcc-4_4-branch

[Jack Howarth <howarth at bromo dot med dot uc dot edu>]

On Sun, Jul 12, 2009 at 09:55:13PM +0200, Richard Guenther wrote:
> On Sun, Jul 12, 2009 at 9:41 PM, Jack Howarth<howarth@bromo.med.uc.edu> wrote:
> > Â I am seeing a new failure on x86_64-apple-darwin10 in current gcc 4.4 branch
> > that wasn't present in the gcc 4.4.0 release. At -m32, the testsuite failure...
> >
> > FAIL: gcc.c-torture/compile/20000804-1.c Â-O0 Â(test for excess errors)
> >
> > appears with the error logged as...
> >
> > Executing on host: /sw/src/fink.build/gcc44-4.4.099-20090711/darwin_objdir/gcc/xgcc -B/sw/src/fink.build/gcc44-4.4.099-20090711/darwin_objdir/gcc/ Â -O3 -fomit-frame-pointer Â...skipping...
> > Executing on host: /sw/src/fink.build/gcc44-4.4.099-20090711/darwin_objdir/gcc/xgcc -B/sw/src/fink.build/gcc44-4.4.099-20090711/darwin_objdir/gcc/  -O0 Â-w -c Â-m32 -o 20000804-1.o /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c  Â(timeout = 300)
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c: In function 'f':
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c:16: error: can't find a register in class 'GENERAL_REGS' while reloading 'asm'
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c:16: error: 'asm' operand has impossible constraints
> > compiler exited with status 1
> > output is:
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c: In function 'f':
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c:16: error: can't find a register in class 'GENERAL_REGS' while reloading 'asm'
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c:16: error: 'asm' operand has impossible constraints
> >
> > FAIL: gcc.c-torture/compile/20000804-1.c Â-O0 Â(test for excess errors)
> > Excess errors:
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c:16: error: can't find a register in class 'GENERAL_REGS' while reloading 'asm'
> > /sw/src/fink.build/gcc44-4.4.099-20090711/gcc-4.4-20090711/gcc/testsuite/gcc.c-torture/compile/20000804-1.c:16: error: 'asm' operand has impossible constraints
> >
> > The failure doesn't occur at -m32 if I pass -fno-PIC on the compilation line. Could someone with current gcc 4.4 branch
> > on x86_64-*-linux check to see if they get the same failure with -m32 -fPIC at -O0 for gcc.c-torture/compile/20000804-1.c?
> > This looks like a regression from gcc 4.4.0.
> 
> Please file a bugreport about this.  Can you constrain the revisions where
> the regression was introduced?
> 
> Thanks,
> Richard.
> 
> > Â Â Â Â Â Â Jack
> >

   A correction. I do see this in gcc 4.4.0 as well on both the x86_64-apple-darwin9 and
the x86_64-apple-darwin10 targets so it isn't a regression in gcc 4.4 branch. However it
is still probably worth looking at since -fPIC doesn't get tested as often on linux.
Interestingly, Apple's gcc-4.0 and gcc-4.2 compilers produce a similar error message when
compiling the testcase against Xcode 3.1.3 under Darwin9...

gcc-4.2  -O0 -w -c -m32 -o 20000804-1.o 20000804-1.c
20000804-1.c: In function âfâ:
20000804-1.c:16: error: can't find a register in class âGENERAL_REGSâ while reloading âasmâ
20000804-1.c:16: error: âasmâ operand has impossible constraints

and no assembly is generated with -save-temps.
                       Jack