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Re: Android native build of GCC
- From: Alexander Monakov <amonakov at ispras dot ru>
- To: Cyd Haselton <chaselton at gmail dot com>
- Cc: Andrew Haley <aph at redhat dot com>, Hans-Peter Nilsson <hp at bitrange dot com>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
- Date: Sun, 15 Feb 2015 21:57:18 +0300 (MSK)
- Subject: Re: Android native build of GCC
- Authentication-results: sourceware.org; auth=none
- References: <54AE581C dot 5070003 at redhat dot com> <alpine dot BSF dot 2 dot 02 dot 1502060258210 dot 10842 at arjuna dot pair dot com> <54D48673 dot 9070901 at redhat dot com> <alpine dot BSF dot 2 dot 02 dot 1502060458370 dot 29537 at arjuna dot pair dot com> <54D49731 dot 7030407 at redhat dot com> <F47323AC-2C7B-47B8-B630-D03A629DD347 at gmail dot com> <54D4A6C2 dot 1040808 at redhat dot com> <CAHu5Prbo2J1p2ueC3G5A6r-ZUo0z6JG1X_9OmshEyKPjjh0hTQ at mail dot gmail dot com> <54D4EA79 dot 10909 at redhat dot com> <6A2D97AB-19B8-4A78-ABE7-B486D1C41FCC at gmail dot com> <54DB14AB dot 3040501 at redhat dot com> <87A6FCF6-9A36-43DE-9981-6663EF51D81F at gmail dot com> <54DB3CB7 dot 1040108 at redhat dot com> <9EFDD493-55C2-4E38-B631-48296428F0AE at gmail dot com> <54DF2CA7 dot 3050303 at redhat dot com> <26AEFC9C-852D-4DE4-A396-79707D3CF48B at gmail dot com> <alpine dot LNX dot 2 dot 11 dot 1502152049120 dot 9341 at monopod dot intra dot ispras dot ru> <CAHu5Prb9wDhmbJU5nvaZTPQbu3ZUw4+0Hj5WUem76KhOe8mPSw at mail dot gmail dot com> <CAHu5PrZ_uBANWL-P3XqM8gRa2UUfReFgyvAB=-_=RsbdjYKymg at mail dot gmail dot com>
On Sun, 15 Feb 2015, Cyd Haselton wrote:
> On Sun, Feb 15, 2015 at 12:41 PM, Cyd Haselton <chaselton@gmail.com> wrote:
>
> *snip*
> >
> >> So to obtain the pointer to
> >> dlopen the code like above can use dlsym(RTLD_DEFAULT, "dlopen"), but not
> >> RTLD_NEXT (the loader precedes the fakeroot library in the lookup chain).
> >>
> *snip*
>
> Just a quick update: RTLD_DEFAULT is definitely not the solution here
> as it results in a segfault when libfakechroot loads. Perhaps a
> different RTLD_FLAG was meant?
I think you need to use RTLD_DEFAULT only when resolving "dlopen", and keep
RTLD_NEXT for all other symbol names (unless later on you run into other
symbols with similar behavior). Something like
... = dlsym(strcmp(name, "dlopen") ? RTLD_NEXT : RTLD_DEFAULT, name);
Alexander