[Bug c/16566] New: internal compiler error: Segmentation fault when compiling a C file.

[Bug c/16566] New: internal compiler error: Segmentation fault when compiling a C file.

[ppelissi at caramail dot com]

I have had this bug with differents GCC releases:

Reading specs from /usr/lib/gcc-lib/i486-linux/3.3.4/specs
Configured with: ../src/configure -v
--enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib
--enable-nls --without-included-gettext --enable-__cxa_atexit
--enable-clocale=gnu --enable-debug --enable-java-gc=boehm
--enable-java-awt=xlib --enable-objc-gc i486-linux
Thread model: posix
gcc version 3.3.4 (Debian)

Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit --enable-languages=c
--disable-libgcj --host=i386-redhat-linux
Thread model: posix
gcc version 3.2.3 20030422 (Red Hat Linux 3.2.3-6)

Reading specs from /global/morpork/gcc-3.4/lib/gcc/i686-pc-linux-gnu/3.4.1/specs
Configured with: ./configure --prefix=/global/morpork/gcc-3.4
Thread model: posix
gcc version 3.4.1

It seems to work fine with:
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.3.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux
Thread model: posix
gcc version 3.3.2 20031022 (Red Hat Linux 3.3.2-1)

Here are the ouput with GCC 3.4.1:

morpork may 58 % /global/morpork/gcc-3.4/bin/gcc -I.
-I/users/spaces/logiciels/mpfr-2.0.2/k7//include
-I/users/spaces/logiciels/gmp-4.1.2/k7//include -g -DWANT_ASSERT -Wall
-Wmissing-prototypes -c dump.c -save-temps
dump.c: In function `may_dump_rec':
dump.c:51: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

This has been tested on different systems too (P3, P4, athlon and amd64).

-- 
           Summary: internal compiler error: Segmentation fault when
                    compiling a C file.
           Product: gcc
           Version: 3.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ppelissi at caramail dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] internal compiler error: Segmentation fault when compiling a C file.

[ppelissi at caramail dot com]

------- Additional Comments From ppelissi at caramail dot com  2004-07-15 14:17 -------
Created an attachment (id=6753)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6753&action=view)
The preprocessed file


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] internal compiler error: Segmentation fault when compiling a C file.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-07-15 14:41 -------
On the mainline I do not get a seg fault but a normal ICE:
pr16566.c: In function `may_dump_rec':
pr16566.c:3565: internal compiler error: in create_tmp_var, at gimplify.c:358
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] ICE with flexible arrays

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-07-15 15:42 -------
Confirmed: 
------------------------ 
struct S; 
 
struct C { 
    int i; 
    struct S *tab[]; 
}; 
 
struct S { struct C c; }; 
 
void foo (struct S *x) { 
  foo(((void)1, x->c).tab[0]);  
} 
--------------------- 
 
g/x> /home/bangerth/bin/gcc-3.4-pre/bin/gcc -c x.c 
x.c: In function `foo': 
x.c:11: internal compiler error: Segmentation fault 
Please submit a full bug report, 
with preprocessed source if appropriate. 
See <URL:http://gcc.gnu.org/bugs.html> for instructions. 
 
g/x> /home/bangerth/bin/gcc-3.5-pre/bin/gcc -c x.c 
x.c: In function `foo': 
x.c:11: internal compiler error: in create_tmp_var, at gimplify.c:358 
Please submit a full bug report, 
with preprocessed source if appropriate. 
See <URL:http://gcc.gnu.org/bugs.html> for instructions. 
 
 
This used to work with 3.2 and 3.3, so is a regression in 3.4 and mainline. 
 
W. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |ice-on-valid-code
      Known to fail|                            |3.4.0 3.5.0
      Known to work|                            |3.2.3 3.3.4
   Last reconfirmed|0000-00-00 00:00:00         |2004-07-15 15:42:34
               date|                            |
            Summary|internal compiler error:    |ICE with flexible arrays
                   |Segmentation fault when     |
                   |compiling a C file.         |
   Target Milestone|---                         |3.4.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] ICE with flexible arrays

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-07-15 20:24 -------
*** Bug 16575 has been marked as a duplicate of this bug. ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] ICE with flexible arrays

[reichelt at gcc dot gnu dot org]

------- Additional Comments From reichelt at gcc dot gnu dot org  2004-07-16 00:51 -------
Even shorter example:

=============================
struct A
{
    int i;
    int x[];
};

int foo(struct A a)
{
    return (a,a).x[0];
}
=============================


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |reichelt at gcc dot gnu dot
                   |                            |org
           Keywords|                            |monitored


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug middle-end/16566] [3.4 Regression] ICE with flexible arrays

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-09 00:22 -------
: Search converges between 2003-11-07-trunk (#398) and 2003-11-08-trunk (#399).

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |middle-end
            Summary|ICE with flexible arrays    |[3.4 Regression] ICE with
                   |                            |flexible arrays


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug middle-end/16566] [3.4/3.5 Regression] ICE with flexible arrays

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-09 00:25 -------
The only thing during that time period that seems likely is:
2003-11-08  Joseph S. Myers  <jsm@polyomino.org.uk>

        * c-typeck.c (pedantic_lvalue_warning): Deprecate compound
        expressions as lvalues.
        (internal_build_compound_expr): Remove special handling for
        non-pedantic case.
        * doc/extend.texi: Document that all extended lvalues are now
        deprecated.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] [3.4/3.5 Regression] ICE with flexible arrays

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-09 00:26 -------
Which looks right as the following is produced:
{
  return (a, NON_LVALUE_EXPR <a.x>)[0];
}

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |c


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

Re: [Bug c/16566] [3.4/3.5 Regression] ICE with flexible arrays

[Joseph S. Myers]

Note that this already fails with 3.2.3 if you use -std=c99 -pedantic.

Also note that though the code should be accepted, it has undefined 
behavior if executed; a non-lvalue with structure with flexible array 
member type is a value that does not refer to an object (other than a 
temporary that disappears at the next sequence point), so members of the 
flexible array can't be accessed without undefined behavior.

-- 
Joseph S. Myers               http://www.srcf.ucam.org/~jsm28/gcc/
    jsm@polyomino.org.uk (personal mail)
    jsm28@gcc.gnu.org (Bugzilla assignments and CCs)

[Bug c/16566] [3.4/3.5 Regression] ICE with flexible arrays

[jsm at polyomino dot org dot uk]

------- Additional Comments From jsm at polyomino dot org dot uk  2004-08-09 11:23 -------
Subject: Re:  [3.4/3.5 Regression] ICE with flexible arrays

Note that this already fails with 3.2.3 if you use -std=c99 -pedantic.

Also note that though the code should be accepted, it has undefined 
behavior if executed; a non-lvalue with structure with flexible array 
member type is a value that does not refer to an object (other than a 
temporary that disappears at the next sequence point), so members of the 
flexible array can't be accessed without undefined behavior.



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] [3.4/3.5 Regression] ICE with flexible arrays

[jsm28 at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
OtherBugsDependingO|                            |16989
              nThis|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] [3.4/3.5 Regression] ICE with flexible arrays

[mmitchel at gcc dot gnu dot org]

------- Additional Comments From mmitchel at gcc dot gnu dot org  2004-08-23 21:01 -------
Postponed until GCC 3.4.3.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.2                       |3.4.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] [3.4/4.0 Regression] ICE with flexible arrays

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-09-22 22:52 -------
Subject: Bug 16566

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	jsm28@gcc.gnu.org	2004-09-22 22:51:58

Modified files:
	gcc            : ChangeLog c-typeck.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/gcc.c-torture/compile: pr16566-1.c pr16566-2.c 
	                                     pr16566-3.c 

Log message:
	PR c/16566
	* c-typeck.c (build_component_ref): Don't special-case
	COMPOUND_EXPR.
	
	testsuite:
	* gcc.c-torture/compile/pr16566-1.c,
	gcc.c-torture/compile/pr16566-2.c,
	gcc.c-torture/compile/pr16566-3.c: New tests.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.5568&r2=2.5569
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-typeck.c.diff?cvsroot=gcc&r1=1.377&r2=1.378
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.4329&r2=1.4330
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/compile/pr16566-1.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/compile/pr16566-2.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/compile/pr16566-3.c.diff?cvsroot=gcc&r1=NONE&r2=1.1



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] [3.4 Regression] ICE with flexible arrays

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-09-23 15:05 -------
Subject: Bug 16566

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_4-branch
Changes by:	jsm28@gcc.gnu.org	2004-09-23 15:05:21

Modified files:
	gcc            : ChangeLog c-typeck.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/gcc.c-torture/compile: pr16566-1.c pr16566-2.c 
	                                     pr16566-3.c 

Log message:
	PR c/16566
	* c-typeck.c (build_component_ref): Don't special-case
	COMPOUND_EXPR.
	
	testsuite:
	* gcc.c-torture/compile/pr16566-1.c,
	gcc.c-torture/compile/pr16566-2.c,
	gcc.c-torture/compile/pr16566-3.c: New tests.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=2.2326.2.631&r2=2.2326.2.632
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-typeck.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.272.2.9&r2=1.272.2.10
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.3389.2.271&r2=1.3389.2.272
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/compile/pr16566-1.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/compile/pr16566-2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/compile/pr16566-3.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=NONE&r2=1.1.2.1



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566

[Bug c/16566] [3.4 Regression] ICE with flexible arrays

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-09-23 15:59 -------
Fixed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16566