Android native build of GCC

Cyd Haselton
Wed Feb 11 12:08:00 GMT 2015

On Wed, Feb 11, 2015 at 5:27 AM, Andrew Haley <> wrote:
> On 02/11/2015 10:00 AM, Cyd Haselton wrote:
>> On February 11, 2015 2:36:59 AM CST, Andrew Haley <> wrote:
>>> On 11/02/15 00:41, Cyd Haselton wrote:
>>>>> I'd rather leave it on-list for future reference.  The best thing
>>>>> would be for libfakechroot to be linked against libdl: that way,
>>> when
>>>>> dlopen() was called the link would be correctly satisfied.  If that
>>>>> isn't possible (if dlopen() doesn't work or is incompatible) then
>>>>> libfakechroot shouldn't export the symbol for dlopen().
>>>> After experimenting with several builds of the fakechroot library I
>>>> can't see how this would be possible.  Even when libdl is linked in,
>>>> hiding dlopen guarantees that the resulting library doesn't
>>>> intercept dlopen calls, which breaks the fakechroot environment and
>>>> removing the fakechroot dlopen code also ensures that dlopen calls
>>>> aren't intercepted.
>>> I don't get it.  If libdl is linked in, why would you hide dlopen() ?
>> libdl was linked in the original, buggy libfakechroot...the one that exported dlopen().
> But if it was linked in, where did the dlopen() link error come from?  It
> should have succeeded because dlopen() should have been found in libdl.
> I still don't get it.
Neither do I...hence my confusion.  Even more so because neither this
nor Linux are systems I usually work with.

I have an idea of what may be the problem, but it's just a guess,
given my rudimentary understanding of how the linker, shared and
dynamic libraries work.

The original libfakechroot was cross-compiled to link against the
system libc, and not the system libdl....hence libdl not being found.

The experiments I did with libfakechroot linked the sysroot libdl and
not the system libdl, therefore all dlopen() calls went straight to
the system libdl, bypassing the fakechroot environment.

Does that sound plausible?


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