[lttng-dev] [PATCH 1/1] Disable liblttng-ust-dl if dlinfo is not available in C library.

[Yann E. MORIN]

Simon, All,

On 2014-04-08 13:03 -0400, Simon Marchi spake thusly:
> Hi Romain,
> 
> It seems like with that commit, dlinfo is not found even on a glibc
> based system, where it is present.
> 
> See https://bugs.lttng.org/issues/778
> 
> Do you have a suggestion to fix that ?

I think we should use AC_CHECK_DECL instead of AC_CHECK_FUNCS.

dlinfo is in dlfcn.h so we need a check that allows us to include that
header, and we must check for that header first, of course. So, maybe
something like (completely untested, directly written in the mail):

    AC_CHECK_HEADER([dlfcn.h])
    AS_IF([test "${ac_cv_header_dlfcn_h}" = "yes"],
          [AC_CHECK_DECL([dlinfo],,,[dlfcn.h])],
          [ac_cv_have_decl_dlinfo="no"])
    AM_CONDITIONAL([HAVE_DLINFO], [test "${ac_cv_have_decl_dlinfo}" = "yes"])

But I'm no expert in autoconf, so the actual solution may be slightly
different.

Regards,
Yann E. MORIN.

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