From dff7391bd829eb73ad28b6f03a3310daad5605cc Mon Sep 17 00:00:00 2001
From: Haru <haru@dotalux.com>
Date: Tue, 19 Apr 2016 00:34:59 +0200
Subject: Added --enable-Werror option to the configure script

It's not always possible (if at all) to pass -Werror in the CFLAGS,
since autoconf often generates test-code that produces warnings.
Example/reference: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734104

Signed-off-by: Haru <haru@dotalux.com>
---
 configure.in | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index c276f7a31..848e055ea 100644
--- a/configure.in
+++ b/configure.in
@@ -338,6 +338,32 @@ AC_ARG_ENABLE(
 )
 
 
+#
+# -Werror compiler flag
+# It's not always possible (if at all) to pass -Werror in the CFLAGS, since
+# autoconf often generates test-code that produces warnings.
+# Reference: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734104
+#
+AC_ARG_ENABLE(
+	[Werror],
+	AC_HELP_STRING(
+		[--enable-Werror],
+		[
+			Enables -Werror in the compiler flags. (disabled by default)
+		]
+	),
+	[
+		enable_Werror="$enableval"
+		case $enableval in
+			"no");;
+			"yes");;
+			*) AC_MSG_ERROR([[invalid argument --enable-Werror=$enableval... stopping]]);;
+		esac
+	],
+	[enable_Werror="no"]
+)
+
+
 #
 # Renewal
 #
@@ -1379,6 +1405,35 @@ if test "$enable_static" != "no" ; then
 	LIBS="$OLD_LIBS"
 fi
 
+#
+# -Werror compiler flag
+#
+if test "$enable_Werror" != "no" ; then
+
+	OLD_CFLAGS="$CFLAGS"
+	CFLAGS="$CFLAGS -Werror"
+
+	AC_MSG_CHECKING([whether $CC supports -Werror])
+	AC_RUN_IFELSE(
+		[AC_LANG_SOURCE([
+			int main(int argc, char **argv){
+				return 0;
+			}
+		])],
+		[
+			AC_MSG_RESULT([yes])
+		],
+		[
+			AC_MSG_RESULT([no])
+			CFLAGS="$OLD_CFLAGS"
+			LDFLAGS="$OLD_LDFLAGS"
+		],
+		[
+			AC_MSG_RESULT([guessing no])
+		]
+	)
+fi
+
 AC_SUBST(STATIC, ${STATIC})
 AC_SUBST(PLUGINSTATIC, ${PLUGINSTATIC})
 
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