1 files changed, 45 insertions, 0 deletions
diff --git a/macros/compiler-flags.m4 b/macros/compiler-flags.m4
new file mode 100644
index 0000000000..953e8ebb5b
--- /dev/null
+++ b/macros/compiler-flags.m4
@@ -0,0 +1,45 @@
+dnl GNOME_COMPILE_WARNINGS
+dnl Turn on many useful compiler warnings
+dnl For now, only works on GCC
+AC_DEFUN([GNOME_COMPILE_WARNINGS],[
+  AC_ARG_ENABLE(compile-warnings, 
+    [  --enable-compile-warnings=[no/minimum/yes]	Turn on compiler warnings.],,enable_compile_warnings=minimum)
+
+  AC_MSG_CHECKING(what warning flags to pass to the C compiler)
+  warnCFLAGS=
+  if test "x$enable_compile_warnings" != "xno"; then
+    if test "x$GCC" = "xyes"; then
+      case " $CFLAGS " in
+      *[\ \	]-Wall[\ \	]*) ;;
+      *) warnCFLAGS="-Wall" ;;
+      esac
+
+      if test "x$enable_compile_warnings" = "xyes"; then
+	warnCFLAGS="$warnCFLAGS -W -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith"
+      fi
+    fi
+  fi
+  AC_MSG_RESULT($warnCFLAGS)
+
+  AC_ARG_ENABLE(iso-c,
+    [  --enable-iso-c	Try to warn if code is not ISO C ],,
+    enable_iso_c=no)
+
+  AC_MSG_CHECKING(what language compliance flags to pass to the C compiler)
+  complCFLAGS=
+  if test "x$enable_iso_c" != "xno"; then
+    if test "x$GCC" = "xyes"; then
+      case " $CFLAGS " in
+      *[\ \	]-ansi[\ \	]*) ;;
+      *) complCFLAGS="$complCFLAGS -ansi" ;;
+      esac
+
+      case " $CFLAGS " in
+      *[\ \	]-pedantic[\ \	]*) ;;
+      *) complCFLAGS="$complCFLAGS -pedantic" ;;
+      esac
+    fi
+  fi
+  AC_MSG_RESULT($complCFLAGS)
+  CFLAGS="$CFLAGS $warnCFLAGS $complCFLAGS"
+])