[Bug middle-end/61848] New: a previous declaration causes the section attribute to be lost

["pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61848

            Bug ID: 61848
           Summary: a previous declaration causes the section attribute to
                    be lost
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org

Take:
void f(void);
void __attribute__ ((__section__(".init.text"))) f(void)
{

}
---- CUT ---
The section attribute is lost from the function.
at -O1, -O0, -Og we get:
    .file    "t.c"
    .text
    .globl    f
    .type    f, @function
f:
.LFB0:
    .cfi_startproc
    rep; ret
    .cfi_endproc
.LFE0:
    .size    f, .-f
    .ident    "GCC: (GNU) 4.10.0 20140718 (experimental)"
    .section    .note.GNU-stack,"",@progbits

While at -O2 and above (including -Os), we get:
    .file    "t.c"
    .section    .text.unlikely,"ax",@progbits
.LCOLDB0:
    .text
.LHOTB0:
    .p2align 4,,15
    .globl    f
    .type    f, @function
f:
.LFB0:
    .cfi_startproc
    rep; ret
    .cfi_endproc
.LFE0:
    .size    f, .-f
    .section    .text.unlikely
.LCOLDE0:
    .text
.LHOTE0:
    .ident    "GCC: (GNU) 4.10.0 20140718 (experimental)"
    .section    .note.GNU-stack,"",@progbits

Notice how f is no longer in the correct section.
If we comment out the declaration (prototype), we get:
    .file    "t.c"
    .section    .init.text,"ax",@progbits
    .globl    f
    .type    f, @function
f:
.LFB0:
    .cfi_startproc
    rep; ret
    .cfi_endproc
.LFE0:
    .size    f, .-f
    .ident    "GCC: (GNU) 4.10.0 20140718 (experimental)"
    .section    .note.GNU-stack,"",@progbits