package/alsa-lib/0004-conditional-enabling-of-libdl-in-m4.patch

   1 alsa-lib: conditionally enable libdl in AM_PATH_ALSA m4 macro
   2
   3 The AM_PATH_ALSA macro in utils/alsa.m4 unconditionally uses -ldl. This
   4 breaks compilation of alsa-utils (and probably other packages using this
   5 macro) for targets that do not support dynamic loading, such as for
   6 Blackfin FLAT binaries.
   7
   8 This patch updates the macro to check if dlopen is available, and use that
   9 result to conditionally add -ldl to the list of libraries.
  10
  11 Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
  12
  13 ---
  14
  15 diff --git a/utils/alsa.m4 b/utils/alsa.m4
  16 --- a/utils/alsa.m4
  17 +++ b/utils/alsa.m4
  18 @@ -44,6 +44,8 @@ if test "$alsa_inc_prefix" != "" ; then
  19  fi
  20  AC_MSG_RESULT($ALSA_CFLAGS)
  21
  22 +AC_CHECK_LIB(c, dlopen, LIBDL="", [AC_CHECK_LIB(dl, dlopen, LIBDL="-ldl")])
  23 +
  24  dnl add any special lib dirs
  25  AC_MSG_CHECKING(for ALSA LDFLAGS)
  26  if test "$alsa_prefix" != "" ; then
  27 @@ -52,7 +54,7 @@ if test "$alsa_prefix" != "" ; then
  28  fi
  29
  30  dnl add the alsa library
  31 -ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"
  32 +ALSA_LIBS="$ALSA_LIBS -lasound -lm $LIBDL -lpthread"
  33  LIBS="$ALSA_LIBS $LIBS"
  34  AC_MSG_RESULT($ALSA_LIBS)
  35