[Bug c/14262] New: Structure size computed wrong

["rbh00 at utsglobal dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Here is the recipe for reproducing this problem.  Reproduce it on a gcc built
for the 64-bit s390x architecture.  I am submitting this bug report at the
request of Ulrich Weigand, to whom I sent the email below.

Ulrich asked that if the code worked correctly on SuSE7, gcc 2.95, that I should
mark this bug as a regression,.  But that was a 31-bit system and the code still
works correctly on (31-bit) s390 in gcc 3.2; it appears to be only a 64-bit problem.

Here's the code that demonstrates the problem:

Hi, Ulrich

Here is a program that doesn't execute correctly on Linux SuSE SLES8 for s390x:

/*
* Reproduce the bad compiler code for tpsilo_.c
*/
#define SIGNED signed
typedef SIGNED char   ACS;
typedef SIGNED char   LSM;
typedef char            PANEL;
typedef char            DRIVE;
typedef struct {
   ACS             acs;
   LSM             lsm;
} LSMID;
typedef struct {
   LSMID           lsm_id;
   PANEL           panel;
} PANELID;
typedef struct {
   PANELID         panel_id;
   DRIVE           drive;
} DRIVEID;

void sub(DRIVEID);

main()
{
       DRIVEID driveid;

       printf("Sizeof DRIVEID is %d\n", sizeof(DRIVEID));

       driveid.drive = 1;
       driveid.panel_id.panel = 9;
       driveid.panel_id.lsm_id.lsm = 0;
       driveid.panel_id.lsm_id.acs = 0;
       printf("main() sent this driveid:\n");
       printf("\tacs = %d\n", driveid.panel_id.lsm_id.acs);
       printf("\tlsm = %d\n", driveid.panel_id.lsm_id.lsm);
       printf("\tpanel = %d\n", driveid.panel_id.panel);
       printf("\tdrive = %d\n", driveid.drive);
       printf("The size of driveid is %d\n", sizeof driveid);
       sub(driveid);
}

void
sub(DRIVEID did)
{
       printf("sub() received this driveid:\n");
       printf("\tacs = %d\n", did.panel_id.lsm_id.acs);
       printf("\tlsm = %d\n", did.panel_id.lsm_id.lsm);
       printf("\tpanel = %d\n", did.panel_id.panel);
       printf("\tdrive = %d\n", did.drive);
}




Apparently the fault is in the caller code:  an "lg" is generated, though the
argument structure is 4 bytes long.  Here is the output of gcc -v:

Reading specs from /usr/lib64/gcc-lib/s390x-suse-linux/3.2/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man
--libdir=/usr/lib64 --enable-languages=c,c++,f77,objc,java --enable-libgcj
--with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib --with-system-zlib
--enable-shared --enable-__cxa_atexit s390x-suse-linux
Thread model: posix
gcc version 3.2

[snip]

Richard Hitt rbh00@utsglobal.com

-- 
           Summary: Structure size computed wrong
           Product: gcc
           Version: 3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rbh00 at utsglobal dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: s390x-suse-linux
  GCC host triplet: s390x-suse-linux
GCC target triplet: s390x-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14262