[Bug gold/21518] New: ld.gold should igmore -pie flag for --oformat=binary mode (ld.bfd does)

[slyfox at inbox dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=21518

            Bug ID: 21518
           Summary: ld.gold should igmore -pie flag for --oformat=binary
                    mode (ld.bfd does)
           Product: binutils
           Version: 2.27
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: slyfox at inbox dot ru
                CC: ian at airs dot com
  Target Milestone: ---

It came up as a build failure of dosemu on gcc-7 with --enable-default-pie:
    https://bugs.gentoo.org/show_bug.cgi?id=618366

Simple reproducer (imagine '-pie' is a default):

$ cat a.S
.text
.code16
  .globl _start16
_start16:

# this works
$ gcc -pie -fuse-ld=gold -Wl,-Ttext,100,-e,_start16,--oformat,binary -nostdlib
-s -o foo.com a.S
/usr/lib/gcc/x86_64-pc-linux-gnu/7.1.0/../../../../x86_64-pc-linux-gnu/bin/ld.gold:
fatal error: binary output format not compatible with -shared or -pie or -r
collect2: error: ld returned 1 exit status

# this fails
$ gcc -pie -fuse-ld=bfd -Wl,-Ttext,100,-e,_start16,--oformat,binary -nostdlib
-s -o foo.com a.S

Arguably '-pie' has no role here as the output format is not really an ELF.

$ x86_64-pc-linux-gnu-ld.gold --version
GNU gold (Gentoo 2.27 p1.0 2.27) 1.12

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