[Bug build/20457] New: gdb build can fail to build with new glibc

["mwahab at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20457

            Bug ID: 20457
           Summary: gdb build can fail to build with new glibc
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: mwahab at gcc dot gnu.org
  Target Milestone: ---

Since glibc/BZ#20311, glibc installs its own version of proc_service.h which
gdb prefers over the version it embeds in gdb_proc_service.h gated by
HAVE_PROC_SERVICE_H. gdb_proc_service.h also has an include for gregset.h which
is only in the !HAVE_PROC_SERVICE_H section, even though its definitions are
used elsewhere without the guard. This causes build failures for some aarch64
and arm configurations. 

The error messages on the failure are like
----
binutils-gdb/gdb/gdb_proc_service.h:173:9: error: ‘gdb_fpregset_t’ does
not name a type; did you mean ‘elf_fpregset_t’?
 typedef gdb_fpregset_t gdb_prfpregset_t;
         ^~~~~~~~~~~~~~
         elf_fpregset_t
----
with other errors relating to other types defined in gregset.h.

I believe that the fix is to simply make the gregset.h include unconditional
and I have a patch to do this. Unfortunately, I'm having some trouble getting a
standalone build to test it (due to my lack of knowledge about gdb/glibc
set-ups). This ticket is to record the problem in the meantime.

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