[network-manager-pptp] Split compiler warnings into separate m4 macro file

[Michael Biebl <mbiebl src gnome org>]

commit c4c9da0e56b9eb6f2f033531c830afd9a3266ebd
Author: Michael Biebl <biebl debian org>
Date:   Thu Apr 23 19:42:52 2009 +0200

    Split compiler warnings into separate m4 macro file
    
    The m4 macro is called NM_COMPILER_WARNINGS. Being in a separate file
    makes it easier reusable for the other NM projects.
---
 configure.ac            |   33 +--------------------------------
 m4/compiler_warnings.m4 |   31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 32 deletions(-)

diff --git a/configure.ac b/configure.ac
index aa20855..04f835b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -95,38 +95,7 @@ if test x"$with_gnome" != xno; then
 	AC_SUBST(GNOMEKEYRING_LIBS)
 fi
 
-AC_ARG_ENABLE(more-warnings,
-AS_HELP_STRING([--enable-more-warnings], [Maximum compiler warnings]),
-set_more_warnings="$enableval",[
-if test -d "$srcdir/{arch}" || test -d "$srcdir/CVS"; then
-	set_more_warnings=yes
-else
-	set_more_warnings=no
-fi
-])
-AC_MSG_CHECKING(for more warnings, including -Werror)
-if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
-	AC_MSG_RESULT(yes)
-	CFLAGS="-Wall -Werror -std=gnu89 $CFLAGS"
-
-	for option in -Wno-unused -Wno-strict-aliasing -Wno-sign-compare -Wdeclaration-after-statement -Wno-pointer-sign ; do
-		SAVE_CFLAGS="$CFLAGS"
-		CFLAGS="$CFLAGS $option"
-		AC_MSG_CHECKING([whether gcc understands $option])
-		AC_TRY_COMPILE([], [],
-			has_option=yes,
-			has_option=no,)
-		if test $has_option = no; then
-			CFLAGS="$SAVE_CFLAGS"
-		fi
-		AC_MSG_RESULT($has_option)
-		unset has_option
-		unset SAVE_CFLAGS
-	done
-	unset option
-else
-	AC_MSG_RESULT(no)
-fi
+NM_COMPILER_WARNINGS
 
 AC_CONFIG_FILES([
 Makefile
diff --git a/m4/compiler_warnings.m4 b/m4/compiler_warnings.m4
new file mode 100644
index 0000000..6cea2f7
--- /dev/null
+++ b/m4/compiler_warnings.m4
@@ -0,0 +1,31 @@
+AC_DEFUN([NM_COMPILER_WARNINGS],
+[AC_ARG_ENABLE(more-warnings,
+	AS_HELP_STRING([--enable-more-warnings], [Maximum compiler warnings]),
+	set_more_warnings="$enableval",set_more_warnings=yes)
+AC_MSG_CHECKING(for more warnings, including -Werror)
+if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
+	AC_MSG_RESULT(yes)
+	CFLAGS="-Wall -Werror -std=gnu89 $CFLAGS"
+
+	for option in -Wshadow -Wmissing-declarations -Wmissing-prototypes \
+		      -Wdeclaration-after-statement -Wstrict-prototypes \
+		      -Wfloat-equal -Wno-unused-parameter -Wno-sign-compare \
+		      -fno-strict-aliasing; do
+		SAVE_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS $option"
+		AC_MSG_CHECKING([whether gcc understands $option])
+		AC_TRY_COMPILE([], [],
+			has_option=yes,
+			has_option=no,)
+		if test $has_option = no; then
+			CFLAGS="$SAVE_CFLAGS"
+		fi
+		AC_MSG_RESULT($has_option)
+		unset has_option
+		unset SAVE_CFLAGS
+	done
+	unset option
+else
+	AC_MSG_RESULT(no)
+fi
+])