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Re: Android native build of GCC


On Fri, Jan 9, 2015 at 1:16 PM, Andrew Haley <aph@redhat.com> wrote:
> On 01/09/2015 10:33 AM, Richard Biener wrote:
>> On Thu, Jan 8, 2015 at 11:12 AM, Andrew Haley <aph@redhat.com> wrote:
>>> Android native GCC can't support LTO because of a lack of support for
>>> dlopen() in the C library.  How should we patch the configury to disable
>>> LTO by default?
>>
>
>> How does LTO need dlopen?  It seems it only cannot use the linker
>> plugin
>
> That's right, it's the plugin which is causing the problem.

Building it, I suppose?  Does --disable-lto-plugin work?

Richard.

>> in which case the existing check for plugin-supporting ld should
>> catch it?
>
> It doesn't seem to.  The problem is probably caused by
> libfakechroot.so, which intercepts calls to dlopen() and tries to
> forward them.  Unfortunately dlopen() is not in Android's libc, so
> libfakechroot returns a link error for dlopen().  I don't know what
> the check for plugin-supporting ld does, but I guess it doesn't call
> dlopen().
>
> I'll grant you that this isn't really our bug: libfakechroot shouldn't
> be exporting dlopen() on Android.
>
> Andrew.


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