[Bug c/37303] New: const compound initializers in structs are written to .data instead of .rodata

[Bug c/37303] New: const compound initializers in structs are written to .data instead of .rodata

[anders at kaseorg dot com]

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GCC generates identical code for the following two structures:

  const struct { const int *p; } foo = { (const int []) {1, 2, 3} };

  const struct { int *p; } foo = { (int []) {1, 2, 3} };

In both cases, the struct is written to the .rodata section, but the array {1,
2, 3} is written to the .data section:

        .section        .rodata
        .align 8
        .type   foo, @object
        .size   foo, 8
foo:
        .quad   __compound_literal.0
        .data
        .align 4
        .type   __compound_literal.0, @object
        .size   __compound_literal.0, 12
__compound_literal.0:
        .long   1
        .long   2
        .long   3

For the first struct, where the array is const, it should also be written to
the .rodata section.

I’m using gcc 4.3.2-0ubuntu2 on Intrepid amd64.


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           Summary: const compound initializers in structs are written to
                    .data instead of .rodata
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: anders at kaseorg dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37303

[Bug c/37303] const compound initializers in structs are written to .data instead of .rodata

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2008-09-02 20:57 -------
Confirmed, not a regression as far as I can tell.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |missed-optimization
      Known to fail|                            |3.3.3 4.0.1 4.1.1 4.4.0
   Last reconfirmed|0000-00-00 00:00:00         |2008-09-02 20:57:27
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37303

[Bug c/37303] const compound initializers in structs are written to .data instead of .rodata

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2008-10-01 17:25 -------
>From C99 6.5.2.5/8:

"String literals, and compound literals with const-qualified types, need not
designate distinct objects"


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37303