From 22e687833cda89855e6dba9b3771ab403771738d Mon Sep 17 00:00:00 2001
From: Michael Biebl <biebl@debian.org>
Date: Wed, 27 Jan 2010 15:48:55 -0800
Subject: build: unify compiler warnings

---
 m4/compiler_warnings.m4 | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 m4/compiler_warnings.m4

(limited to 'm4/compiler_warnings.m4')

diff --git a/m4/compiler_warnings.m4 b/m4/compiler_warnings.m4
new file mode 100644
index 00000000..6cea2f74
--- /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
+])
-- 
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