From: Francois-Xavier Le Bail <fx.lebail@yahoo.com>
Date: Thu, 18 Aug 2016 23:19:51 +0000 (+0200)
Subject: Compile with '-Wused-but-marked-unused' in devel mode if supported
X-Git-Tag: tcpdump-4.9.0-bp~192
X-Git-Url: https://git.tcpdump.org/tcpdump/commitdiff_plain/b7cbdfc92d1bddcdf4a6a7ad8cfb004364d4d59c

Compile with '-Wused-but-marked-unused' in devel mode if supported

f.e. clang version 3.4 support this warning option.
---

diff --git a/aclocal.m4 b/aclocal.m4
index ca78a02c..4fa5b80d 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -994,6 +994,7 @@ AC_DEFUN(AC_LBL_DEVEL,
 		    AC_LBL_CHECK_COMPILER_OPT($1, -Wdeclaration-after-statement)
 		    AC_LBL_CHECK_COMPILER_OPT($1, -pedantic)
 		    AC_LBL_CHECK_COMPILER_OPT($1, -Wold-style-definition)
+		    AC_LBL_CHECK_COMPILER_OPT($1, -Wused-but-marked-unused)
 		    AC_LBL_CHECK_COMPILER_OPT($1, -W)
 	    fi
 	    AC_LBL_CHECK_DEPENDENCY_GENERATION_OPT()
diff --git a/configure b/configure
index a5c1026a..af19566a 100755
--- a/configure
+++ b/configure
@@ -7660,6 +7660,49 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports the -Wused-but-marked-unused option" >&5
+$as_echo_n "checking whether the compiler supports the -Wused-but-marked-unused option... " >&6; }
+	save_CFLAGS="$CFLAGS"
+	if expr "x-Wused-but-marked-unused" : "x-W.*" >/dev/null
+	then
+	    CFLAGS="$CFLAGS $ac_lbl_unknown_warning_option_error -Wused-but-marked-unused"
+	elif expr "x-Wused-but-marked-unused" : "x-f.*" >/dev/null
+	then
+	    CFLAGS="$CFLAGS -Werror -Wused-but-marked-unused"
+	elif expr "x-Wused-but-marked-unused" : "x-m.*" >/dev/null
+	then
+	    CFLAGS="$CFLAGS -Werror -Wused-but-marked-unused"
+	else
+	    CFLAGS="$CFLAGS -Wused-but-marked-unused"
+	fi
+	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+return 0
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+		CFLAGS="$save_CFLAGS"
+		V_CCOPT="$V_CCOPT -Wused-but-marked-unused"
+
+else
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+		CFLAGS="$save_CFLAGS"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports the -W option" >&5
 $as_echo_n "checking whether the compiler supports the -W option... " >&6; }
 	save_CFLAGS="$CFLAGS"