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[RFC] The never ending 32-bit vs. 64-bit blues
- From: Mark Kettenis <mark dot kettenis at xs4all dot nl>
- To: gdb at sourceware dot org
- Date: Mon, 7 Nov 2005 23:45:49 +0100 (CET)
- Subject: [RFC] The never ending 32-bit vs. 64-bit blues
In the past we have had a lot of bug reports from people trying to
debug 64-bit programs with a native 32-bit gdb. As far as I know we
don't support any native configuration that allows this. I've never
quite managed to come up with a satisfactory solution to deal with
this. Here's an attempt to deal with it by making configure complain.
Any opinions about this?
Mark
Index: configure.ac
===================================================================
RCS file: /cvs/src/src/gdb/configure.ac,v
retrieving revision 1.24
diff -u -p -r1.24 configure.ac
--- configure.ac 25 Jul 2005 15:08:40 -0000 1.24
+++ configure.ac 7 Nov 2005 22:34:19 -0000
@@ -34,6 +34,19 @@ AM_PROG_CC_STDC
AC_CONFIG_AUX_DIR(`cd $srcdir;pwd`/..)
AC_CANONICAL_SYSTEM
+# Sanity check; refuse to build a native GDB for a 64-bit target with
+# a 32-bit compiler.
+AC_CHECK_SIZEOF(void *)
+if test "${target}" = "${host}"; then
+ case "$host_cpu" in
+ hppa64|mips64*|powerpc64|sparc64|x86_64)
+ if test $ac_cv_sizeof_void_p != 8; then
+ AC_MSG_ERROR(
+[building native target ${host} with a 32-bit compiler is not supported])
+ fi
+ esac
+fi
+
dnl List of object files and targets accumulated by configure.
CONFIG_OBS=