On Tue, Dec 23, 2014 at 9:19 AM, Andrew Haley <aph@xxxxxxxxxx> wrote:
> On 12/23/2014 10:05 AM, Cyd Haselton wrote:
>> Last additional questions:
>> 1) Why did the 4.8.3 on-device build pick up the necessary -ldl from
>> LIBS, while the 4.9.2 build does not?
>> (I've been working on this problem for a while...including going
>> through the Changelogs for GCC, libgcc, etc...I've not found what
>> changed between 4.8.x and 4.9.x that would cause this)
>
> I don't know. linus-android.h does contain
>
> #define ANDROID_LIB_SPEC \
> "%{!static: -ldl}"
>
> so it should work. Does that appear in -dumpspecs?
It does. However, -ldl does not appear in the link-command section of
dumpspecs...specifically for libasan...as it does for the build
version (4.8.3)
build version:
*snip*
%{!nostdlib:%{!nodefaultlibs:%{fsanitize=address:
%{static-libasan:-ldl -lpthread}
*snip*
stage1 version
*snip*
%{!nostdlib:%{!nodefaultlibs:%{%:sanitize(address):
%{static-libasan:%:include(libsanitizer.spec)%(link_libasan)}
%{static:%ecannot specify -static with -fsanitize=address}}
%{%:sanitize(thread):
%{static-libtsan:%:include(libsanitizer.spec)%(link_libtsan)}
%{!pie:%{!shared:%e-fsanitize=thread linking must be done with -pie or
-shared}}} %{%:sanitize(undefined):%{static-libubsan:-Bstatic}
-lubsan %{static-libubsan:-Bdynamic}
%{static-libubsan:%:include(libsanitizer.spec)%(link_libubsan)}}
%{%:sanitize(leak):
%{static-liblsan:%:include(libsanitizer.spec)%(link_liblsan)}}}}
*snip*
>
>> 2) Are the linker script specs visible by gcc -dumpspecs, and editable
>> by modifying linux-android.h and gnu-user.h?
>> (I've modified both to add -ldl, with no results...i.e. same error)
>
> No. GCC doesn't even know that /usr/lib/libc.so is a linker script.
>
> Given that Android doesn't seem to use this scheme, it's probably a
> red herring.
>
> Andrew.
>
If all else fails a linker script, ported to Android, may be something
to investigate...especially given the env i'm working with.
