[Bug ld/21961] New: --orphan-handling=error fails in 2.29 because of changed .group handling

[franz.sirl at lauterbach dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21961

            Bug ID: 21961
           Summary: --orphan-handling=error fails in 2.29 because of
                    changed .group handling
           Product: binutils
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: franz.sirl at lauterbach dot com
  Target Milestone: ---

This testcase highlights a change in 2.29 .group handling:

/* group.c
 *
 * Compile/link like this:
 *   gcc -c -o group.o group.c
 *   ld --orphan-handling=error -emain -Bstatic -o a.out group.o
 *
 * Produces output like this:
 *   ld: error: unplaced orphan section '.group' from 'group.o'.
 *
 * Problem: .group not handled in default linker script(s)
 *          + binutils-2.29 producing .group sections for C++ code
 *
 * Tested with binutils-2.29 + gcc-7.2.0 on x86_64-linux-gnu and
powerpc-unknown-eabi
 */

/* assembler source copied from binutils testsuite group-3.s  */
asm(    "\t.section .text.foo3,\"axG\",%progbits,foo3,comdat\n"
        "\t.global foo3\n"
"foo3:\n"
        "\t.word 0\n"
        "\t.section .data.bar3,\"awG\",%progbits,foo3,comdat\n"
        "\t.global bar3\n"
"bar3:\n"
        "\t.word 0");

int main(int argc, char *argv[])
{
        return 0;
}

void __eabi(void)
{
}

I'm not sure what exactly the bug is, either the .group sections shouldn't
reach the final link stage or the default linker scripts need updating.
binutils-2.28 links the same testcase without error.
The problem originally happened with an embedded C++ codebase
(PowerPC32+newlib).

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