Specify -ldl with libasan in XGCC Specs

[Cyd Haselton]

On Sat, Dec 13, 2014 at 6:45 PM, Cyd Haselton <chaselton@gmail.com> wrote:
> This is (hopefully)  related to the previous issue I posted about
> libgcc failing to build on Android.  I ran gcc -dumpspec, xgcc
> -dumpspec, compared the two and noticed that, for the *link_command
> -ldl is specified with -lpthread for static-libasan for the installed
> GCC and is not for the *link_command portion of the newly built
> XGCC...which appears to be used for building libgcc.
>
> Is there a way to change the link_command for the newly built xgcc so
> that it includes -ldl?
>
> Alternatively, if I am off track with troubleshooting, let me know.

UPDATE:  I may have found the solution to this issue; googling libasan
and libpthread yielded a link to gnu-user.h from a different repo
which led me to hunt down the 4.8.0 version of the same file, which
included two additional defines:

/* Additional libraries needed by -static-libasan.  */
#undef STATIC_LIBASAN_LIBS
#define STATIC_LIBASAN_LIBS "-ldl -lpthread"

/* Additional libraries needed by -static-libtsan.  */
#undef STATIC_LIBTSAN_LIBS
#define STATIC_LIBTSAN_LIBS "-ldl -lpthread"

I've added these to the end of the 4.9.2 gnu-user.h and am currently
re-running make after running make clean in the builddir/gcc
directory.