[Bug build/13011] New: GDB accesses internals of glibc's dynamicloader, failing to build with alternate libc

["wkor97gy0eef1fr at p dot mintemail.com"<sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13011

           Summary: GDB accesses internals of glibc's dynamic loader,
                    failing to build with alternate libc
           Product: gdb
           Version: 7.2
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
        AssignedTo: unassigned@sourceware.org
        ReportedBy: wkor97gy0eef1fr@p.mintemail.com


it wrongly assumes that any system out there has the same internals as glibc.
if it uses those internals at all, it should at least check if they are
available and if not choose an alternate implementation that doesn't rely on
those internals (even it if its just a "sorry, this function is not available"
implementation).

tested against musl libc 0.7.2

linux-thread-db.Tpo linux-thread-db.c
linux-thread-db.c: In function `dladdr_to_soname':
linux-thread-db.c:618: error: `Dl_info' undeclared (first use in this function)
linux-thread-db.c:618: error: (Each undeclared identifier is reported only once
linux-thread-db.c:618: error: for each function it appears in.)
linux-thread-db.c:618: error: syntax error before "info"
linux-thread-db.c:620: warning: implicit declaration of function `dladdr'
linux-thread-db.c:620: error: `info' undeclared (first use in this function)
linux-thread-db.c: In function `try_thread_db_load_1':
linux-thread-db.c:717: error: `LIBTHREAD_DB_SO' undeclared (first use in this
function)
linux-thread-db.c: In function `thread_db_load_search':
linux-thread-db.c:803: error: `LIBTHREAD_DB_SO' undeclared (first use in this
function)
linux-thread-db.c: In function `thread_db_load':
linux-thread-db.c:890: error: `LIBTHREAD_DB_SO' undeclared (first use in this
function)
linux-thread-db.c: In function `thread_db_pid_to_str':
linux-thread-db.c:1488: warning: long unsigned int format, thread_t arg (arg 4)
linux-thread-db.c: In function `thread_db_find_thread_from_tid':
linux-thread-db.c:1597: warning: comparison between pointer and integer
linux-thread-db.c: In function `_initialize_thread_db':
linux-thread-db.c:1676: error: `LIBTHREAD_DB_SEARCH_PATH' undeclared (first use
in this function)

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