[Bug bootstrap/101245] New: Bootstrap fails for a combined tree with --enable-shared

[Bug bootstrap/101245] New: Bootstrap fails for a combined tree with --enable-shared

[christoph.hoeger at celeraone dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101245

            Bug ID: 101245
           Summary: Bootstrap fails for a combined tree with
                    --enable-shared
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: christoph.hoeger at celeraone dot com
  Target Milestone: ---

Created attachment 51075
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51075&action=edit
Reproduction build script

I tried to bootstrap gcc 11.1.0 with binutils 2.36.1 in a combined tree and the
build fails in stage2 when building libiberty.

The failure stems from as not finding its shared libraries (opcode and bfd).
The RPATH is set wrong:

➜  test2 readelf -d build/prev-gas/.libs/lt-as-new | grep RPATH
 0x000000000000000f (RPATH)              Library rpath:
[/home/choeger/c1/scratch/gcc-combined/test2/build/opcodes/.libs:/home/choeger/c1/scratch/gcc-combined/test2/build/bfd/.libs:/usr/local/lib]
➜  test2

As you can see, the RPATH is not reset to the prev- directories.

➜  test2 build/prev-gas/as-new 
/home/choeger/c1/scratch/gcc-combined/test2/build/prev-gas/.libs/lt-as-new:
error while loading shared libraries: libopcodes-2.36.1.so: cannot open shared
object file: No such file or directory

Find attached a script to reproduce the issue.