[Bug build/14003] New: build fails on solaris in infrun.c because of empty inferior_suspend_state struct

["tim.mooney at ndsu dot edu" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14003

             Bug #: 14003
           Summary: build fails on solaris in infrun.c because of empty
                    inferior_suspend_state struct
           Product: gdb
           Version: 7.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
        AssignedTo: unassigned@sourceware.org
        ReportedBy: tim.mooney@ndsu.edu
    Classification: Unclassified


Attempting to build gdb-7.4 on x86_64-sun-solaris2.10 with the Sun/Oracle
Studio 12.3 compiler.  I've previously built gdb (7.0.1, 7.2, some earlier
versions) with the Studio toolchain.

I'm using

  CFLAGS='-Xa -g3 -features=extensions -xtarget=native -m64 -xarch=native'

The compile fails in infrun.c:

source='infrun.c' object='infrun.o' libtool=no DEPDIR=.deps
depmode=dashXmstdout
 /bin/bash ./../depcomp cc -Xa -g3 -features=extensions -xtarget=native -m64
-xa
rch=native -I/local/gnu/include -I/local/gnu/include -I/local/include   -I. -I. 
-I./common -I./config -DLOCALEDIR="\"/local/gnu/share/locale\"" -DHAVE_CONFIG_H 
-I./../include/opcode -I./../opcodes/.. -I./../readline/.. -I../bfd -I./../bfd
-
I./../include -I../libdecnumber -I./../libdecnumber  -I./gnulib -Ignulib  
-DTUI
=1  -I/local/gnu/include -I/local/gnu/include -I/local/include 
-I/usr/include/p
ython2.4 -I/usr/include/python2.4   -c -o infrun.o infrun.c
"inferior.h", line 401: warning: zero-sized struct/union
"inferior.h", line 401: warning: zero-sized struct/union
"infrun.c", line 6644: unknown operand size: op "="
"infrun.c", line 6668: unknown operand size: op "="
cc: acomp failed for infrun.c
gmake[2]: *** [infrun.o] Error 2
gmake[2]: *** Waiting for unfinished jobs....
gmake[2]: Leaving directory `/local/src/RPM/BUILD/gdb-7.4/gdb'


The problem is that "struct inferior_suspend_state" has no members, so the
compiler doesn't know the size for "suspend" in struct inferior, when it's
assigned to something else.

I worked around this issue by adding a "void * placeholder" member to struct
inferior_suspend_state, but it's not clear to me what point there is in having
a structure with no members.

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