[Bug ld/24874] New: ld: --gc-sections reorders GNU build attributes

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24874

            Bug ID: 24874
           Summary: ld: --gc-sections reorders GNU build attributes
           Product: binutils
           Version: 2.32
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---

On Fedora rawhide, this reproducer:

cat > t.c <<EOF
int main (void)
{
}
EOF
gcc -ffunction-sections t.c -Wl,--gc-sections
strip a.out

fails with:

strip:a.out[.gnu.build.attributes]: bad GNU build attribute notes: first note
not version note: bad value

The reason is that --gc-sections reorders the build attribute notes:

Displaying notes found in: .gnu.build.attributes
  Owner                 Data size       Description
  GA$<tool>gcc 9.1.1 20190605  0x00000000       OPEN        Applies to region
from 0
  GA*GOW:0x452a                0x00000000       OPEN        Applies to region
from 0
  GA*<stack prot>off           0x00000000       OPEN        Applies to region
from 0
  GA+stack_clash:true          0x00000000       OPEN        Applies to region
from 0
…

The expected order (at least for strip) is like this:

Displaying notes found in: .gnu.build.attributes
  Owner                 Data size       Description
  GA$<version>3h877            0x00000010       OPEN        Applies to region
from 0x401020 to 0x401020 (.annobin_init.c.hot)
  GA$<tool>gcc 9.1.1 20190605  0x00000000       OPEN        Applies to region
from 0x401020
  GA*GOW:0x452a                0x00000000       OPEN        Applies to region
from 0x401020
…

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