[r14-6770 Regression] FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors) on Linux/x86_64

[r14-6770 Regression] FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors) on Linux/x86_64

[haochen.jiang]

On Linux/x86_64,

23fee88f84873b0b8b41c8e5a9b229d533fb4022 is the first bad commit
commit 23fee88f84873b0b8b41c8e5a9b229d533fb4022
Author: Martin Uecker <uecker@tugraz.at>
Date:   Tue Aug 15 14:58:32 2023 +0200

    c23: tag compatibility rules for struct and unions

caused

FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6770/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-tag-4.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-tag-4.c --target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me at haochen dot jiang at intel.com.)
(If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
(However, please make sure that there is no potential problems with AVX512.)

Re: [r14-6770 Regression] FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors) on Linux/x86_64

[Martin Uecker]

Hm, this is weird, as it really seems to depend on the
-march=....  So if there is really a difference
between those structs which make them incompatible on
some archs, we should not consider them to be
compatible in general.

struct g { int a[n]; int b; } *y;
{ struct g { int a[4]; int b; } *y2 = y; }

But I do not see what could go wrong here as
sizeof / alignment is the same for n = 4.  So there
is something else I missed....



Am Freitag, dem 22.12.2023 um 05:07 +0800 schrieb haochen.jiang:
> On Linux/x86_64,
> 
> 23fee88f84873b0b8b41c8e5a9b229d533fb4022 is the first bad commit
> commit 23fee88f84873b0b8b41c8e5a9b229d533fb4022
> Author: Martin Uecker <uecker@tugraz.at>
> Date:   Tue Aug 15 14:58:32 2023 +0200
> 
>     c23: tag compatibility rules for struct and unions
> 
> caused
> 
> FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors)
> 
> with GCC configured with
> 
> ../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6770/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap
> 
> To reproduce:
> 
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-tag-4.c --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-tag-4.c --target_board='unix{-m64\ -march=cascadelake}'"
> 
> (Please do not reply to this email, for question about this report, contact me at haochen dot jiang at intel.com.)
> (If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
> (However, please make sure that there is no potential problems with AVX512.)

RE: [r14-6770 Regression] FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors) on Linux/x86_64

[Jiang, Haochen]

It is not a target specific issue, it will fail if we enabled AVX.

e.g.:

$ /export/users/haochenj/env/build_no_bootstrap_master/gcc/xgcc -B/export/users/haochenj/env/build_no_bootstrap_master/gcc/  /export/users/haochenj/src/gcc/master/gcc/testsuite/gcc.dg/gnu23-tag-4.c  -m64 -mavx   -fdiagnostics-plain-output   -std=gnu23 -S -o gnu23-tag-4.s
/export/users/haochenj/src/gcc/master/gcc/testsuite/gcc.dg/gnu23-tag-4.c: In function ‘bar’:
/export/users/haochenj/src/gcc/master/gcc/testsuite/gcc.dg/gnu23-tag-4.c:18:47: error: initialization of ‘struct g *’ from incompatible pointer type ‘struct g *’ [-Wincompatible-pointer-types]

Thx,
Haochen

> -----Original Message-----
> From: Martin Uecker <uecker@tugraz.at>
> Sent: Friday, December 22, 2023 5:39 PM
> To: gcc-regression@gcc.gnu.org; gcc-patches@gcc.gnu.org; Jiang, Haochen
> <haochen.jiang@intel.com>; Joseph Myers <joseph@codesourcery.com>
> Subject: Re: [r14-6770 Regression] FAIL: gcc.dg/gnu23-tag-4.c (test for excess
> errors) on Linux/x86_64
> 
> 
> Hm, this is weird, as it really seems to depend on the -march=....  So if there is
> really a difference between those structs which make them incompatible on
> some archs, we should not consider them to be compatible in general.
> 
> struct g { int a[n]; int b; } *y;
> { struct g { int a[4]; int b; } *y2 = y; }
> 
> But I do not see what could go wrong here as sizeof / alignment is the same for
> n = 4.  So there is something else I missed....
> 
> 
> 
> Am Freitag, dem 22.12.2023 um 05:07 +0800 schrieb haochen.jiang:
> > On Linux/x86_64,
> >
> > 23fee88f84873b0b8b41c8e5a9b229d533fb4022 is the first bad commit
> > commit 23fee88f84873b0b8b41c8e5a9b229d533fb4022
> > Author: Martin Uecker <uecker@tugraz.at>
> > Date:   Tue Aug 15 14:58:32 2023 +0200
> >
> >     c23: tag compatibility rules for struct and unions
> >
> > caused
> >
> > FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors)
> >
> > with GCC configured with
> >
> > ../../gcc/configure
> > --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6770/
> > usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld
> > --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet
> > --without-isl --enable-libmpx x86_64-linux --disable-bootstrap
> >
> > To reproduce:
> >
> > $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-
> tag-4.c --target_board='unix{-m32\ -march=cascadelake}'"
> > $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-
> tag-4.c --target_board='unix{-m64\ -march=cascadelake}'"
> >
> > (Please do not reply to this email, for question about this report,
> > contact me at haochen dot jiang at intel.com.) (If you met problems
> > with cascadelake related, disabling AVX512F in command line might save
> that.) (However, please make sure that there is no potential problems with
> AVX512.)

Re: [r14-6770 Regression] FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors) on Linux/x86_64

[Martin Uecker]

Yes, I am testing a patch. The DECL_FIELD_BIT_OFFSET are set
inconsistently for some reason.

Martin 

Am Montag, dem 25.12.2023 um 07:49 +0000 schrieb Jiang, Haochen:
> It is not a target specific issue, it will fail if we enabled AVX.
> 
> e.g.:
> 
> $ /export/users/haochenj/env/build_no_bootstrap_master/gcc/xgcc -B/export/users/haochenj/env/build_no_bootstrap_master/gcc/  /export/users/haochenj/src/gcc/master/gcc/testsuite/gcc.dg/gnu23-tag-4.c  -m64 -mavx   -fdiagnostics-plain-output   -std=gnu23 -S -o gnu23-tag-4.s
> /export/users/haochenj/src/gcc/master/gcc/testsuite/gcc.dg/gnu23-tag-4.c: In function ‘bar’:
> /export/users/haochenj/src/gcc/master/gcc/testsuite/gcc.dg/gnu23-tag-4.c:18:47: error: initialization of ‘struct g *’ from incompatible pointer type ‘struct g *’ [-Wincompatible-pointer-types]
> 
> Thx,
> Haochen
> 
> > -----Original Message-----
> > From: Martin Uecker <uecker@tugraz.at>
> > Sent: Friday, December 22, 2023 5:39 PM
> > To: gcc-regression@gcc.gnu.org; gcc-patches@gcc.gnu.org; Jiang, Haochen
> > <haochen.jiang@intel.com>; Joseph Myers <joseph@codesourcery.com>
> > Subject: Re: [r14-6770 Regression] FAIL: gcc.dg/gnu23-tag-4.c (test for excess
> > errors) on Linux/x86_64
> > 
> > 
> > Hm, this is weird, as it really seems to depend on the -march=....  So if there is
> > really a difference between those structs which make them incompatible on
> > some archs, we should not consider them to be compatible in general.
> > 
> > struct g { int a[n]; int b; } *y;
> > { struct g { int a[4]; int b; } *y2 = y; }
> > 
> > But I do not see what could go wrong here as sizeof / alignment is the same for
> > n = 4.  So there is something else I missed....
> > 
> > 
> > 
> > Am Freitag, dem 22.12.2023 um 05:07 +0800 schrieb haochen.jiang:
> > > On Linux/x86_64,
> > > 
> > > 23fee88f84873b0b8b41c8e5a9b229d533fb4022 is the first bad commit
> > > commit 23fee88f84873b0b8b41c8e5a9b229d533fb4022
> > > Author: Martin Uecker <uecker@tugraz.at>
> > > Date:   Tue Aug 15 14:58:32 2023 +0200
> > > 
> > >     c23: tag compatibility rules for struct and unions
> > > 
> > > caused
> > > 
> > > FAIL: gcc.dg/gnu23-tag-4.c (test for excess errors)
> > > 
> > > with GCC configured with
> > > 
> > > ../../gcc/configure
> > > --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6770/
> > > usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld
> > > --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet
> > > --without-isl --enable-libmpx x86_64-linux --disable-bootstrap
> > > 
> > > To reproduce:
> > > 
> > > $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-
> > tag-4.c --target_board='unix{-m32\ -march=cascadelake}'"
> > > $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/gnu23-
> > tag-4.c --target_board='unix{-m64\ -march=cascadelake}'"
> > > 
> > > (Please do not reply to this email, for question about this report,
> > > contact me at haochen dot jiang at intel.com.) (If you met problems
> > > with cascadelake related, disabling AVX512F in command line might save
> > that.) (However, please make sure that there is no potential problems with
> > AVX512.)
>