Do not hard-code -ldl in fuzz/Makefile.am

* configure.ac: Search for dlopen and add library to $FUZZ_LIBS
* fuzz/Makefile.am: Link with $FUZZ_LIBS instead of -ldl

This fixes linking on BSD systems.

Reported-by: Nam Nguyen

configure.ac

@@ -103,6 +103,15 @@ AC_ARG_ENABLE([fuzzing],
 #AC_SUBST([FUZZ_LIBS])
 AM_CONDITIONAL([FUZZING], [test "$enable_fuzzing" = "yes"])
 
+dnl needed for some fuzzers
+OLD_LIBS="$LIBS"
+AC_SEARCH_LIBS([dlopen], [dl dld])
+if [[ "${ac_cv_search_dlopen#-l}" != "${ac_cv_search_dlopen}" ]]; then
+  FUZZ_LIBS="${ac_cv_search_dlopen}"
+  AC_SUBST([FUZZ_LIBS])
+fi
+LIBS="$OLD_LIBS"
+
 dnl Opie: Support for opie s/key FTP logins
 AC_ARG_ENABLE([opie],
   [AS_HELP_STRING([--disable-opie], [disable support for opie or s/key FTP login])],

fuzz/Makefile.am

@@ -6,7 +6,7 @@ LDADD = ../lib/libgnu.a \
  $(LIBSOCKET) $(LIB_CLOCK_GETTIME) $(LIB_CRYPTO) $(LIB_GETLOGIN) $(LIB_NANOSLEEP) $(LIB_POLL) \
  $(LIB_POSIX_SPAWN) $(LIB_PTHREAD_SIGMASK) $(LIB_SELECT) $(LIBICONV) $(LIBINTL) \
  $(LIBMULTITHREAD) $(LIBTHREAD) $(SERVENT_LIB) @INTL_MACOSX_LIBS@ \
- -ldl
+ $(FUZZ_LIBS)
 
 WGET_TESTS = \
  wget_css_fuzzer$(EXEEXT) \