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

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

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

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The gdb-7.12-branch branch has been updated by Matthew Wahab
<mwahab@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2e9ffae9c70279ba7b226b9bf5f2f9b20968375c

commit 2e9ffae9c70279ba7b226b9bf5f2f9b20968375c
Author: Matthew Wahab <matthew.wahab@arm.com>
Date:   Mon Aug 15 13:09:04 2016 +0100

    [GDB] Fix builds broken by proc-service changes.

    GLIBC BZ#20311 introduced a change to install proc_service.h so that gdb
    didn't have to use the version it embeds in gdb_proc_service.h. The
    embedded version is guarded by HAVE_PROC_SERVICE_H and
    gdb_proc_service.h has a number other of includes and definitions, all
    of which are uncondional except for an include for gregset.h. This is
    only included if HAVE_PROC_SERIVCE_H is not defined.

    This causes a build failure when cross compiling gdb with the latest
    glibc because type definitions in gregset are used independently of
    HAVE_PROC_SERIVCE_H. In particular, they are used in gdb_proc_service.h
    when PRFPREGSET_T_BROKEN is set.

    The error messages on the failure are
    ----
    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

    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

    binutils-gdb/gdb/proc-service.c:218:15: error: ‘gdb_prfpregset_t’ does
    not name a type; did you mean ‘gdb_fpregset_t’?
             const gdb_prfpregset_t *fpregset)
                   ^~~~~~~~~~~~~~~~
                   gdb_fpregset_t
    ----

    This patch moves the include for gregset.h to before the code guarded by
    HAVE_PROC_SERIVCE_H, so that it is always included. This is enough to
    fix the build.

    2016-08-15  Matthew Wahab  <matthew.wahab@arm.com>

        PR gdb/20457
        * gdb_proc_service.h: Add an include of gregset.h
            [!HAVE_PROC_SERVICE_H]: Remove the include of gregset.h.

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