[Bug symtab/18148] Definitions with DW_AT_const_value never make it into the psymtabs

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18148

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andy Wingo <wingo@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ff908ebf8612a737d9e168eca0604ff6c97556bc

commit ff908ebf8612a737d9e168eca0604ff6c97556bc
Author: Andy Wingo <wingo@igalia.com>
Date:   Thu Mar 26 19:41:15 2015 +0100

    Properly intern constants into psymtab

    Variables with a DW_AT_const_value but without a DW_AT_location were not
    getting added to the partial symbol table.  They are added to the full
    symbol table, however, when the compilation unit's psymtabs are
    expanded.

    Before:

       (gdb) p one
       No symbol "one" in current context.
       (gdb) mt flush-symbol-cache
       (gdb) mt expand one.c
       (gdb) p one
       $1 = 1

    After:

       (gdb) p one
       $1 = 1

    To the user it's pretty strange, as depending on whether tab completion
    has forced expansion of all CUs or not the lookup might succeed, or not
    if the failure was already added to the symbol cache.

    This commit simply makes sure to add constants to the partial symbol
    tables.

    gdb/testsuite/ChangeLog:

        PR symtab/18148
        * gdb.dwarf2/dw2-intercu.S (one, two): Add variables that have a
        const_value but not a location.
        * gdb.dwarf2/dw2-intercu.exp: Add tests that constants without
        location defined in non-main CUs are visible.

    gdb/ChangeLog:

        PR symtab/18148
        * dwarf2read.c (struct partial_die_info): Add has_const_value
        member.
        (add_partial_symbol): Don't punt on symbols that have const_value
        attributes.
        (read_partial_die): Detect DW_AT_const_value.

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