1 files changed, 97 insertions, 0 deletions
diff --git a/m4/fr_smart_check_lib.m4 b/m4/fr_smart_check_lib.m4
new file mode 100644
index 0000000..16ac5b3
--- /dev/null
+++ b/m4/fr_smart_check_lib.m4
@@ -0,0 +1,97 @@
+dnl #
+dnl #  Look for a library in a number of places.
+dnl #
+dnl #  FR_SMART_CHECK_LIB(library, function)
+dnl #
+AC_DEFUN([FR_SMART_CHECK_LIB], [
+
+sm_lib_safe=`echo "$1" | sed 'y%./+-%__p_%'`
+sm_func_safe=`echo "$2" | sed 'y%./+-%__p_%'`
+
+dnl #
+dnl #  We pass all arguments for linker testing in CCPFLAGS as these
+dnl #  will be passed to the compiler (then linker) first.
+dnl #
+dnl #  The linker will search through -L directories in the order they
+dnl #  appear on the command line.  Unfortunately the same rules appear
+dnl #  to apply to directories specified with --sysroot, so we must
+dnl #  pass the user specified directory first.
+dnl #
+dnl #  Really we should be using LDFLAGS (-L<dir>) for this.
+dnl #
+old_LIBS="$LIBS"
+old_CPPFLAGS="$CPPFLAGS"
+smart_lib=
+smart_ldflags=
+smart_lib_dir=
+
+dnl #
+dnl #  Try first any user-specified directory, otherwise we may pick up
+dnl #  the wrong version.
+dnl #
+if test "x$smart_try_dir" != "x"; then
+  for try in $smart_try_dir; do
+    AC_MSG_CHECKING([for $2 in -l$1 in $try])
+    LIBS="-l$1 $old_LIBS"
+    CPPFLAGS="-L$try -Wl,-rpath,$try $old_CPPFLAGS"
+    AC_TRY_LINK([extern char $2();],
+		[$2()],
+		[
+		 smart_lib="-l$1"
+		 smart_ldflags="-L$try -Wl,-rpath,$try"
+		 AC_MSG_RESULT(yes)
+		 break
+		],
+		[AC_MSG_RESULT(no)])
+  done
+  LIBS="$old_LIBS"
+  CPPFLAGS="$old_CPPFLAGS"
+fi
+
+dnl #
+dnl #  Try using the default library path
+dnl #
+if test "x$smart_lib" = "x"; then
+  AC_MSG_CHECKING([for $2 in -l$1])
+  LIBS="-l$1 $old_LIBS"
+  AC_TRY_LINK([extern char $2();],
+	      [$2()],
+	      [
+	        smart_lib="-l$1"
+	        AC_MSG_RESULT(yes)
+	      ],
+	      [AC_MSG_RESULT(no)])
+  LIBS="$old_LIBS"
+fi
+
+dnl #
+dnl #  Try to guess possible locations.
+dnl #
+if test "x$smart_lib" = "x"; then
+  for try in /usr/local/lib /opt/lib; do
+    AC_MSG_CHECKING([for $2 in -l$1 in $try])
+    LIBS="-l$1 $old_LIBS"
+    CPPFLAGS="-L$try -Wl,-rpath,$try $old_CPPFLAGS"
+    AC_TRY_LINK([extern char $2();],
+		[$2()],
+		[
+		  smart_lib="-l$1"
+		  smart_ldflags="-L$try -Wl,-rpath,$try"
+		  AC_MSG_RESULT(yes)
+		  break
+		],
+		[AC_MSG_RESULT(no)])
+  done
+  LIBS="$old_LIBS"
+  CPPFLAGS="$old_CPPFLAGS"
+fi
+
+dnl #
+dnl #  Found it, set the appropriate variable.
+dnl #
+if test "x$smart_lib" != "x"; then
+  eval "ac_cv_lib_${sm_lib_safe}_${sm_func_safe}=yes"
+  LIBS="$smart_ldflags $smart_lib $old_LIBS"
+  SMART_LIBS="$smart_ldflags $smart_lib $SMART_LIBS"
+fi
+])