In case of uclibc, use libuargp

If we use uclibc for system libraries, select libuargp

Upstream-Status: Pending

Signed-off-by: Maxin B. John <maxin.john@intel.com>
---
diff -Naur rng-tools-5-orig/configure.ac rng-tools-5/configure.ac
--- rng-tools-5-orig/configure.ac	2016-02-24 18:11:24.023690235 +0200
+++ rng-tools-5/configure.ac	2016-02-24 18:14:49.763118138 +0200
@@ -39,6 +39,13 @@
 	[with_libargp=check]
 )
 
+AC_ARG_ENABLE([uclibc],
+    AS_HELP_STRING([--enable-uclibc], [Use uclibc for system libraries]),
+        use_uclibc=yes, use_uclibc=no)
+AM_CONDITIONAL(USE_UCLIBC, test "x$use_uclibc" = "xyes")
+AS_IF([test "x$use_uclibc" = "xyes"], [AC_DEFINE(USE_UCLIBC)])
+AH_TEMPLATE([USE_UCLIBC], [Defined if uclibc libraries are used.])
+
 dnl Make sure anyone changing configure.ac/Makefile.am has a clue
 AM_MAINTAINER_MODE
 
@@ -101,7 +108,7 @@
 			[need_libargp=no],
 			[need_libargp=yes
 			 if test "x$with_libargp" = "xno"; then
-				AC_MSG_FAILURE([libargp disabled and libc does not have argp])
+				AC_MSG_WARN([libargp disabled and libc does not have argp])
 			 fi]
 		)
 	],
@@ -110,7 +117,7 @@
 
 dnl Check for libargp
 AS_IF(
-	[test "x$need_libargp" = "xyes"],
+	[test "x$need_libargp" = "xyes" -a "x$use_uclibc" = "xno"],
 	[
 		AC_CHECK_LIB(
 			[argp],
@@ -120,6 +127,19 @@
 		)
 	]
 )
+
+dnl Check for libuargp
+AS_IF(
+	[test "x$use_uclibc" = "xyes"],
+	[
+		AC_CHECK_LIB(
+			[uargp],
+			[argp_parse],
+			[LIBS="$LIBS -luargp"],
+			[AC_MSG_FAILURE([libuargp not found])]
+		)
+	]
+)
 
 dnl -----------------
 dnl Configure options