[Bug binutils/27081] New: Unexpected output on nm version 2.35.50.0.1.20201215

[joao.moreira at intel dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27081

            Bug ID: 27081
           Summary: Unexpected output on nm version 2.35.50.0.1.20201215
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: joao.moreira at intel dot com
  Target Milestone: ---

GNU nm version 2.35.50.0.1.20201215 (which is part of the latest Fedora 33
package) has unexpected outputs. The bug was noticed while configuring upstream
glibc with the respective package on Fedora 33.

Invoking nm over a manually compiled test, similarly as done in the glibc
configure file, will result in the following output:

bfd plugin: No register_all_symbols_read hook

And this causes the following error in the glibc configure:

checking for __builtin_trap with no external dependencies... configure: error:
confusing output from nm -u

FTR, applying the below diff to the glibc configure works as a temporary
workaround for the bug (but is hardly a solution).

-libc_undefs=`$NM -u conftest.o |
+libc_undefs=`$NM -u conftest.o | grep -v bfd |

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