+2012-04-18 Paul Eggert <eggert@cs.ucla.edu>
+
+ configure: new option --enable-gcc-warnings (Bug#11207)
+ * Makefile.in (C_WARNINGS_SWITCH): Remove.
+ (WARN_CFLAGS, WERROR_CFLAGS): New macros.
+ (BASE_CFLAGS): Use new macros rather than old.
+
2012-04-16 Paul Eggert <eggert@cs.ucla.edu>
Assume less-ancient POSIX support.