From: Thomas De Schampheleire thomas.de.schampheleire@gmail.com

The AM_PATH_ALSA macro in utils/alsa.m4 unconditionally uses -ldl. This breaks compilation of alsa-utils (and probably other packages using this macro) for targets that do not support dynamic loading.

This patch updates the macro to check if dlopen is available, and use that result to conditionally add -ldl to the list of libraries.

Signed-off-by: Thomas De Schampheleire thomas.de.schampheleire@gmail.com Signed-off-by: Jörg Krause joerg.krause@embedded.rocks Signed-off-by: Thomas Petazzoni thomas.petazzoni@bootlin.com --- utils/alsa.m4 | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/utils/alsa.m4 b/utils/alsa.m4 index e12310df..a5c5a292 100644 --- a/utils/alsa.m4 +++ b/utils/alsa.m4 @@ -44,6 +44,8 @@ if test "$alsa_inc_prefix" != "" ; then fi AC_MSG_RESULT($ALSA_CFLAGS)

+AC_CHECK_LIB(c, dlopen, LIBDL="", [AC_CHECK_LIB(dl, dlopen, LIBDL="-ldl")]) + dnl add any special lib dirs AC_MSG_CHECKING(for ALSA LDFLAGS) if test "$alsa_prefix" != "" ; then @@ -52,7 +54,7 @@ if test "$alsa_prefix" != "" ; then fi

dnl add the alsa library -ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread" +ALSA_LIBS="$ALSA_LIBS -lasound -lm $LIBDL -lpthread" LIBS="$ALSA_LIBS $LIBS" AC_MSG_RESULT($ALSA_LIBS)