[buddy]

Add support for --enable-devel and similar macros.

* m4/debug.m4: Rename to ...
* m4/bdebug.m4: ... this.
* m4/debug.m4, m4/devel.m4, m4/gccoptim.m4, m4/ndebug.m4: New file.
* m4/gccwarns.m4: Fix usage of cache variable.  Fix shell
syntax.  Do not check for -Waggregate-return.  Update CFLAGS.
* configure.ac: Adjust to handle --enable-devel and similar macros
in the same way as Spot.

buddy/configure.ac

@@ -4,6 +4,13 @@ AC_CONFIG_AUX_DIR([tools])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([foreign nostdinc no-define 1.7.3])
 
+# If the user didn't supply a CFLAGS value,
+# set an empty one to prevent autoconf to stick -O2 -g here.
+test -z "$CFLAGS" && CFLAGS=
+test -z "$CXXFLAGS" && CXXFLAGS=
+
+adl_ENABLE_DEVEL
+
 AC_PROG_CC
 
 AM_PROG_LEX
@@ -13,9 +20,17 @@ AC_PROG_CXX
 
 LT_INIT([win32-dll])
 
+adl_ENABLE_DEBUG
+ad_GCC_OPTIM
+adl_NDEBUG
+
 buddy_INTEL
 buddy_DEBUG_FLAGS
 
+if test x$enable_warnings = xyes; then
+  CF_GCC_WARNINGS
+fi
+
 AC_CONFIG_HEADERS([config.h])
 
 AC_CONFIG_FILES([