Ensure that we always have the "bool" type in C, as well as the constants

"true" and "false", either via the C99 header <stdbool.h> or via our own
declarations.

This commit was SVN r91.

configure.ac

@@ -83,6 +83,7 @@ AH_TOP([/* -*- c -*-
 #define LAM_CONFIG_H
 ])
 AH_BOTTOM([
+#include <lam_config.h>
 #endif /* LAM_CONFIG_H */
 ])
 
@@ -136,6 +137,8 @@ LAM_SETUP_CC
 # check for c99 features
 
 AC_C_INLINE
+AC_CHECK_HEADERS(stdbool.h)
+# JMS This macro will be re-written by Dave for licensing reasons
 AX_CREATE_STDINT_H([src/include/lam_stdint.h])
 
 

src/include/lam_config_bottom.h

@@ -0,0 +1,21 @@
+/*
+ * $HEADER$
+ *
+ * This file is included at the bottom of lam_config.h, and is
+ * therefore a) after all the #define's that were output from
+ * configure, and b) included in most/all files in LAM/MPI.
+ *
+ * Since this file is *only* ever included by lam_config.h, and
+ * lam_config.h already has #ifndef/#endif protection, there is no
+ * need to #ifndef/#endif protection here.
+ */
+
+/* If we're in C, bring in the bool type and true/false constants. */
+
+#ifndef __cplusplus
+#ifdef HAVE_STDBOOL_H
+#include <stdbool.h>
+#else
+typedef enum { false, true } bool;
+#endif
+#endif