[Bug c/19079] New: Unamed struct/union issues with typedef

["frantas at brfree dot com dot br" <gcc-bugzilla at gcc dot gnu dot org>]

The following code generates an error with gcc-3.4.3. It compiles fine with
gcc-3.2.3. Please see the comments in the code.

--------------- code -----------------
typedef union { int b; float c; } MyUnionType;

MyUnionType bar;

struct {
  int a;
  union {
    int b;
    float c;
  };
  int d;
} foo;

struct {
  int a;
  MyUnionType x;
  int d;
} foo1;

struct {
  int a;
  MyUnionType;          /* here we get a warning */
  int d;
} foo2;

void test(void) {
        bar.b = 1;      /* the typedef works */
        foo.b = 2;      /* the unamed union in the struct works */
        foo1.x.b = 3;   /* the typedefed union in the struct works */
        foo2.b = 4;     /* but not if unamed - here we get an error */
}
---------------- end of code --------------------

---------------- compiler output ----------------
Reading specs from /opt/gcc/lib/gcc/i686-pc-linux-gnu/3.4.3/specs
Configured with: ../configure --prefix=/opt/gcc
Thread model: posix
gcc version 3.4.3
 /opt/gcc/libexec/gcc/i686-pc-linux-gnu/3.4.3/cc1 -E -quiet -v unamedstruct.c
-mtune=pentiumpro -o unamedstruct.i
ignoring nonexistent directory
"/opt/gcc/lib/gcc/i686-pc-linux-gnu/3.4.3/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /opt/gcc/include
 /opt/gcc/lib/gcc/i686-pc-linux-gnu/3.4.3/include
 /usr/include
End of search list.
 /opt/gcc/libexec/gcc/i686-pc-linux-gnu/3.4.3/cc1 -fpreprocessed unamedstruct.i
-quiet -dumpbase unamedstruct.c -mtune=pentiumpro -auxbase unamedstruct -version
-o unamedstruct.s
GNU C version 3.4.3 (i686-pc-linux-gnu)
        compiled by GNU C version 3.3.3 (release).
GGC heuristics: --param ggc-min-expand=62 --param ggc-min-heapsize=60386
unamedstruct.c:22: warning: declaration does not declare anything
unamedstruct.c: In function `test':
unamedstruct.c:30: error: structure has no member named `b'
-------------end of compiler output -------------

-- 
           Summary: Unamed struct/union issues with typedef
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: frantas at brfree dot com dot br
                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=19079