[Bug symtab/17276] gdb needs to coalesce multiple line number entries for the same (non-prologue) line

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https://sourceware.org/bugzilla/show_bug.cgi?id=17276

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a05a36a5fc98c816381b25c37e8aa971cc86c28d

commit a05a36a5fc98c816381b25c37e8aa971cc86c28d
Author: Doug Evans <dje@google.com>
Date:   Fri Aug 22 17:25:59 2014 -0700

    Fix pr 17276.

    See the description here:
    https://sourceware.org/ml/gdb-patches/2014-08/msg00283.html

    This patch keeps track of whether the current line has seen a
    non-zero discriminator, and if so coalesces consecutive entries
    for the same line (by ignoring all entries after the first).

    gdb/ChangeLog:

        PR 17276
        * dwarf2read.c (dwarf_record_line_p): New function.
        (dwarf_decode_lines_1): Ignore subsequent line number entries
        for the same line if any entry had a non-zero discriminator.

    gdb/testsuite/ChangeLog:

        * gdb.dwarf2/dw2-single-line-discriminators.S: New file.
        * gdb.dwarf2/dw2-single-line-discriminators.c: New file.
        * gdb.dwarf2/dw2-single-line-discriminators.exp: New file.

-----------------------------------------------------------------------

Summary of changes:
 gdb/ChangeLog                                      |    7 +
 gdb/dwarf2read.c                                   |  108 +++++++-
 gdb/testsuite/ChangeLog                            |    7 +
 .../gdb.dwarf2/dw2-single-line-discriminators.S    |  281 ++++++++++++++++++++
 .../gdb.dwarf2/dw2-single-line-discriminators.c    |   31 +++
 .../gdb.dwarf2/dw2-single-line-discriminators.exp  |   49 ++++
 6 files changed, 471 insertions(+), 12 deletions(-)
 create mode 100644 gdb/testsuite/gdb.dwarf2/dw2-single-line-discriminators.S
 create mode 100644 gdb/testsuite/gdb.dwarf2/dw2-single-line-discriminators.c
 create mode 100644 gdb/testsuite/gdb.dwarf2/dw2-single-line-discriminators.exp

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