[rfa] HAVE_UINTPTR_T

[Michael Elizabeth Chastain <mec@shout.net>]

Draft #2.  I changed the variable to HAVE_UINTPTR_T, and I changed
AC_TRY_RUN to AC_TRY_COMPILE.  I re-tested with and without
uintptr_t in /usr/include/stdint.h to hit both paths.

I don't show diffs for regenerated 'configure'.  I regenerated
'configure' with stock autoconf 2.13 from ftp.gnu.org.

Again, this is so that the gdb build can do something better when
it needs uintptr_t and doesn't have it (pr gdb/660).  My notion of
'something better' is going to be to spit out a better error message,
not to actually work.  Somebody has to have a really old libc
(more than 3 years old) to get this message, but with millions of
users, some people do.

OK to commit?

Michael C

2003-02-25  Michael Chastain  <mec@shout.net>

	* configure.in: New variable HAVE_UINTPTR_T.
	* config.in: Likewise.
	* configure: Regenerated.

Index: config.in
===================================================================
RCS file: /cvs/src/src/gdb/config.in,v
retrieving revision 1.53
diff -u -r1.53 config.in
--- config.in	14 Feb 2003 20:07:00 -0000	1.53
+++ config.in	26 Feb 2003 01:20:51 -0000
@@ -111,6 +111,9 @@
 /* Define if ioctl argument PIOCSET is available. */
 #undef HAVE_PROCFS_PIOCSET
 
+/* Define if the C library supports "uintptr_t" type. */
+#undef HAVE_UINTPTR_T
+
 /* Define if the `long long' type works.  */
 #undef CC_HAS_LONG_LONG
 
Index: configure.in
===================================================================
RCS file: /cvs/src/src/gdb/configure.in,v
retrieving revision 1.125
diff -u -r1.125 configure.in
--- configure.in	20 Feb 2003 23:38:58 -0000	1.125
+++ configure.in	26 Feb 2003 01:20:52 -0000
@@ -689,6 +689,21 @@
   fi
 fi
 
+dnl See if C library supports "uintptr_t" type.
+dnl AC_CHECK_TYPE is not enough because this type lives in a header file.
+
+AC_MSG_CHECKING(for uintptr_t in C library)
+AC_CACHE_VAL(gdb_cv_have_uintptr_t,
+[AC_TRY_COMPILE([#include <stdint.h>],
+		[uintptr_t foo = 0;
+	         return foo;],
+                gdb_cv_have_uintptr_t=yes,
+                gdb_cv_have_uintptr_t=no)])
+AC_MSG_RESULT($gdb_cv_have_uintptr_t)
+if test $gdb_cv_have_uintptr_t = yes; then
+  AC_DEFINE(HAVE_UINTPTR_T)
+fi
+
 dnl See if compiler supports "long long" type.
 
 AC_MSG_CHECKING(for long long support in compiler)