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

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

[wkor97gy0eef1fr at p dot mintemail.com]

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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[Bug build/13011] GDB fails to build against Linux libc's (e.g. musl) without dladdr and libthread_db

[ppluzhnikov at google dot com]

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

Paul Pluzhnikov <ppluzhnikov at google dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppluzhnikov at google dot
                   |                            |com
            Summary|GDB accesses internals of   |GDB fails to build against
                   |glibc's dynamic loader,     |Linux libc's (e.g. musl)
                   |failing to build with       |without dladdr and
                   |alternate libc              |libthread_db

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[Bug build/13011] GDB fails to build against Linux libc's (e.g. musl) without dladdr and libthread_db

[ppluzhnikov at google dot com]

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

--- Comment #1 from Paul Pluzhnikov <ppluzhnikov at google dot com> 2011-07-31 18:59:53 UTC ---
This doesn't have anything to do with glibc internals -- dladdr() is a
published *external* glibc interface.

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[Bug build/13011] GDB fails to build against Linux libc's (e.g. musl) without dladdr and libthread_db

[bugdal at aerifal dot cx]

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

Rich Felker <bugdal at aerifal dot cx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugdal at aerifal dot cx

--- Comment #2 from Rich Felker <bugdal at aerifal dot cx> 2012-10-21 14:37:00 UTC ---
It's true that it's a published external interface, but gdb should not use it
without testing for its existence. FYI we now provide dladdr in musl, but I
have not seen any good documentation on how to provide the thread debugging
hooks gdb wants, and it seems highly nontrivial. It would be helpful to have
this fixed, and for gdb to provide some minimal level of thread debugging
support without including half of the debugger in the program being debugged...

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[Bug build/13011] GDB fails to build against Linux libc's (e.g. musl) without dladdr and libthread_db

[xdje42 at gmail dot com]

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

Doug Evans <xdje42 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |xdje42 at gmail dot com
         Resolution|---                         |FIXED

--- Comment #3 from Doug Evans <xdje42 at gmail dot com> ---
gdb and gdbserver build with musl now.
gdb requires a couple of minor patches, but they're not libthread_db related.

There's still a plethora of other issues of course.

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