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utils/alsa.m4: conditionally enable libdl in AM_PATH_ALSA m4 macro

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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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Thomas De Schampheleire 2018-11-01 15:40:07 +01:00 • committed by Takashi Iwai
parent 9a8d0b0ad5
commit 178fe66bc8
1 changed files with 3 additions and 1 deletions
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4
utils/alsa.m4
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@ -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)