split out and doc lib update warnings from test.c

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/test/update-warnings.h b/src/test/update-warnings.h
new file mode 100644
index 0000000..05cf242
--- /dev/null
+++ b/src/test/update-warnings.h
@@ -0,0 +1,60 @@
+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <libgamma.h>
+
+
+/*
+ * This file testes whether the program is out of date
+ * when it is compiled. This is done by checking for newer
+ * values of constants that tells us how much there is of
+ * different things for which we may want to create
+ * descriptions or otherwise handle especially.
+ * 
+ * To get the current value of for example `LIBGAMMA_ERROR_MIN`
+ * simply run the command
+ * 
+ *     cpp <<EOF | tail -n 1
+ *     #include <libgamma.h>
+ *     LIBGAMMA_ERROR_MIN
+ *     EOF
+ *
+ * However, we only do this for if GCC is used to
+ * compile the program because the #warning CPP
+ * directive is a GCC extension. If you are not
+ * using GNU you may want to find another way to
+ * accomplish this.
+ */
+
+#ifdef __GNUC__
+# if LIBGAMMA_ERROR_MIN < -46
+#  warning New error codes have been added to libgamma.
+# endif
+# if LIBGAMMA_METHOD_COUNT > 6
+#  warning New adjust methods has been added to libgamma
+# endif
+# if LIBGAMMA_CONNECTOR_TYPE_COUNT > 20
+#  warning New connector types have been added to libgamma.
+# endif
+# if LIBGAMMA_SUBPIXEL_ORDER_COUNT > 6
+#  warning New subpixel orders have been added to libgamma.
+# endif
+# if LIBGAMMA_CRTC_INFO_COUNT > 13
+#  warning New CRTC information fields have been added to libgamma.
+# endif
+#endif
+