* ./configure.ac.in: we only add -lm to the a52 linkage if it's needed

    (and available).

configure.ac.in

@@ -309,7 +309,8 @@ AC_TYPE_SIGNAL
 AC_CHECK_LIB(dl,dlopen,LDFLAGS_vlc="${LDFLAGS_vlc} -ldl")
 AC_CHECK_LIB(m,cos,
   LDFLAGS_imdct="${LDFLAGS_imdct} -lm"
-  LDFLAGS_filter_distort="${LDFLAGS_filter_distort} -lm")
+  LDFLAGS_filter_distort="${LDFLAGS_filter_distort} -lm"
+  LDFLAGS_a52tofloat32="${LDFLAGS_a52tofloat32} -lm")
 AC_CHECK_LIB(m,pow,
   LDFLAGS_ffmpeg="${LDFLAGS_ffmpeg} -lm"
   LDFLAGS_imdct="${LDFLAGS_imdct} -lm"
@@ -1426,7 +1427,7 @@ then
       LDFLAGS="${LDFLAGS_save} ${LDFLAGS_a52tofloat32}"
       AC_CHECK_LIB(a52, a52_free, [
         BUILTINS="${BUILTINS} a52tofloat32"
-        LDFLAGS_a52tofloat32="${LDFLAGS_a52tofloat32} -la52 -lm"
+        LDFLAGS_a52tofloat32="-la52 ${LDFLAGS_a52tofloat32}"
         CPPFLAGS_a52tofloat32="${CPPFLAGS_a52tofloat32} -DUSE_A52DEC_TREE"
         ],[
         if test -f ${real_a52_tree}/liba52/.libs/liba52.a
@@ -1435,7 +1436,7 @@ then
         else
           AC_MSG_ERROR([the specified tree hasn't been compiled])
         fi
-      ],[-lm])
+      ])
       LDFLAGS="${LDFLAGS_save}"
     else
       AC_MSG_RESULT(no)
@@ -1455,14 +1456,14 @@ then
     AC_CHECK_HEADERS(a52dec/a52.h, [
       AC_CHECK_LIB(a52, a52_free, [
         PLUGINS="${PLUGINS} a52tofloat32"
-        LDFLAGS_a52tofloat32="${LDFLAGS_a52tofloat32} ${LDFLAGS_test} -la52 -lm"
+        LDFLAGS_a52tofloat32="${LDFLAGS_test} -la52 ${LDFLAGS_a52tofloat32}"
         CPPFLAGS_a52tofloat32="${CPPFLAGS_a52tofloat32} ${CPPFLAGS_test}"
       ],[
         if test "x${enable_dvbpsi}" != "x"
         then
           AC_MSG_ERROR([Could not find a52 on your system: you may get it from http://liba52.sf.net])
         fi
-      ],[-lm])
+      ])
     ])
     CPPFLAGS="${CPPFLAGS_save}"
     LDFLAGS="${LDFLAGS_save}"