Remove assumption that there is a host.

5 files changed, 76 insertions, 30 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 11ec997..e3f1bb2 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,11 @@
 2002-01-20  Andrew Cagney  <ac131313@redhat.com>
 
+	* configure.in (host_makefile_frag): Only require a host makefile
+	fragment when a native build.
+	* configure: Re-generate.
+
+2002-01-20  Andrew Cagney  <ac131313@redhat.com>
+
 	* doublest.h (floatformat_from_type): Declare.
 	* doublest.c (floatformat_from_type): New function.
 	(convert_typed_floating): Use.
diff --git a/gdb/configure b/gdb/configure
index 78e55f2..e34f29e 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -8437,7 +8437,14 @@ fi
 frags=
 host_makefile_frag=${srcdir}/config/${gdb_host_cpu}/${gdb_host}.mh
 if test ! -f ${host_makefile_frag}; then
-{ echo "configure: error: "*** Gdb does not support host ${host}"" 1>&2; exit 1; }
+    # When building a native debuger the .mh file containing things
+    # like NATDEPFILES is needed.  Cross debuggers don't need .mh
+    # since it no longer contains anything useful.
+    if test "${target}" = "${host}"; then
+	{ echo "configure: error: "*** Gdb does not support native target ${host}"" 1>&2; exit 1; }
+    else
+	host_makefile_frag=/dev/null
+    fi
 fi
 frags="$frags $host_makefile_frag"
 
@@ -8564,7 +8571,7 @@ fi
 
 
 echo $ac_n "checking whether ln -s works""... $ac_c" 1>&6
-echo "configure:8568: checking whether ln -s works" >&5
+echo "configure:8575: checking whether ln -s works" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_LN_S'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8588,12 +8595,12 @@ fi
 
 
 echo $ac_n "checking for Cygwin environment""... $ac_c" 1>&6
-echo "configure:8592: checking for Cygwin environment" >&5
+echo "configure:8599: checking for Cygwin environment" >&5
 if eval "test \"`echo '$''{'ac_cv_cygwin'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 8597 "configure"
+#line 8604 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -8604,7 +8611,7 @@ int main() {
 return __CYGWIN__;
 ; return 0; }
 EOF
-if { (eval echo configure:8608: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:8615: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_cygwin=yes
 else
@@ -8621,19 +8628,19 @@ echo "$ac_t""$ac_cv_cygwin" 1>&6
 CYGWIN=
 test "$ac_cv_cygwin" = yes && CYGWIN=yes
 echo $ac_n "checking for mingw32 environment""... $ac_c" 1>&6
-echo "configure:8625: checking for mingw32 environment" >&5
+echo "configure:8632: checking for mingw32 environment" >&5
 if eval "test \"`echo '$''{'ac_cv_mingw32'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 8630 "configure"
+#line 8637 "configure"
 #include "confdefs.h"
 
 int main() {
 return __MINGW32__;
 ; return 0; }
 EOF
-if { (eval echo configure:8637: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:8644: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_mingw32=yes
 else
@@ -8652,7 +8659,7 @@ test "$ac_cv_mingw32" = yes && MINGW32=yes
 
 
 echo $ac_n "checking for executable suffix""... $ac_c" 1>&6
-echo "configure:8656: checking for executable suffix" >&5
+echo "configure:8663: checking for executable suffix" >&5
 if eval "test \"`echo '$''{'ac_cv_exeext'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8662,7 +8669,7 @@ else
   rm -f conftest*
   echo 'int main () { return 0; }' > conftest.$ac_ext
   ac_cv_exeext=
-  if { (eval echo configure:8666: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+  if { (eval echo configure:8673: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
     for file in conftest.*; do
       case $file in
       *.c | *.o | *.obj | *.ilk | *.pdb) ;;
diff --git a/gdb/configure.in b/gdb/configure.in
index 6eef43c..25d7068 100644
--- a/gdb/configure.in
+++ b/gdb/configure.in
@@ -1203,7 +1203,14 @@ AC_SUBST(target_subdir)
 frags=
 host_makefile_frag=${srcdir}/config/${gdb_host_cpu}/${gdb_host}.mh
 if test ! -f ${host_makefile_frag}; then
-AC_MSG_ERROR("*** Gdb does not support host ${host}")
+    # When building a native debuger the .mh file containing things
+    # like NATDEPFILES is needed.  Cross debuggers don't need .mh
+    # since it no longer contains anything useful.
+    if test "${target}" = "${host}"; then
+	AC_MSG_ERROR("*** Gdb does not support native target ${host}")
+    else
+	host_makefile_frag=/dev/null
+    fi
 fi
 frags="$frags $host_makefile_frag"
 
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index fe7cf21..f94c102 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,5 +1,11 @@
 2002-01-20  Andrew Cagney  <ac131313@redhat.com>
 
+	* gdbint.texinfo (Host Definition): Revise.  xm-xyz.h and xyz.mh
+	are no longer needed.
+	(Porting GDB): Add maintainer note about configure.host.
+
+2002-01-20  Andrew Cagney  <ac131313@redhat.com>
+
 	* gdbint.texinfo (Target Architecture Definition): Remove
 	definition of IEEE_FLOAT.
 
diff --git a/gdb/doc/gdbint.texinfo b/gdb/doc/gdbint.texinfo
index 515b30b..6605a76 100644
--- a/gdb/doc/gdbint.texinfo
+++ b/gdb/doc/gdbint.texinfo
@@ -2020,38 +2020,44 @@ distribution!
 
 @chapter Host Definition
 
-@emph{Maintainer's note: In theory, new targets no longer need to use
-the host framework described below.  Instead it should be possible to
-handle everything using autoconf.  Patches eliminating this framework
-welcome.}
-
 With the advent of Autoconf, it's rarely necessary to have host
-definition machinery anymore.
+definition machinery anymore.  The following information is provided,
+mainly, as an historical reference.
 
 @section Adding a New Host
 
 @cindex adding a new host
 @cindex host, adding
-Most of @value{GDBN}'s host configuration support happens via
-Autoconf.  New host-specific definitions should be rarely needed.
-@value{GDBN} still uses the host-specific definitions and files listed
-below, but these mostly exist for historical reasons, and should
+@value{GDBN}'s host configuration support normally happens via Autoconf.
+New host-specific definitions should not be needed.  Older hosts
+@value{GDBN} still use the host-specific definitions and files listed
+below, but these mostly exist for historical reasons, and will
 eventually disappear.
 
-Several files control @value{GDBN}'s configuration for host systems:
-
 @table @file
 @item gdb/config/@var{arch}/@var{xyz}.mh
-Specifies Makefile fragments needed when hosting on machine @var{xyz}.
-Optionally specifies the header file which describes host @var{xyz}, by
-defining @code{XM_FILE= xm-@var{xyz}.h}.  You can also define @code{CC},
+This file once contained both host and native configuration information
+(@pxref{Native Debugging}) for the machine @var{xyz}.  The host
+configuration information is now handed by Autoconf.
+
+Host configuration information included a definition of
+@code{XM_FILE=xm-@var{xyz}.h} and possibly definitions for @code{CC},
 @code{SYSV_DEFINE}, @code{XM_CFLAGS}, @code{XM_ADD_FILES},
 @code{XM_CLIBS}, @code{XM_CDEPS}, etc.; see @file{Makefile.in}.
 
+New host only configurations do not need this file.
+
 @item gdb/config/@var{arch}/xm-@var{xyz}.h
-(@file{xm.h} is a link to this file, created by @code{configure}).  Contains C
-macro definitions describing the host system environment, such as byte
-order, host C compiler and library.
+This file once contained definitions and includes required when hosting
+gdb on machine @var{xyz}.  Those definitions and includes are now
+handled by Autoconf.
+
+New host and native configurations do not need this file.
+
+@emph{Maintainer's note: Some hosts continue to use the @file{xm-xyz.h}
+file to define the macros @var{HOST_FLOAT_FORMAT},
+@var{HOST_DOUBLE_FORMAT} and @var{HOST_LONG_DOUBLE_FORMAT}.  That code
+also needs to be replaced with either an Autoconf or run-time test.}
 
 @end table
 
@@ -3762,7 +3768,7 @@ Several files control @value{GDBN}'s configuration for native support:
 @table @file
 @vindex NATDEPFILES
 @item gdb/config/@var{arch}/@var{xyz}.mh
-Specifies Makefile fragments needed when hosting @emph{or native} on
+Specifies Makefile fragments needed by a @emph{native} configuration on
 machine @var{xyz}.  In particular, this lists the required
 native-dependent object files, by defining @samp{NATDEPFILES=@dots{}}.
 Also specifies the header file which describes native support on
@@ -3770,6 +3776,13 @@ Also specifies the header file which describes native support on
 define @samp{NAT_CFLAGS}, @samp{NAT_ADD_FILES}, @samp{NAT_CLIBS},
 @samp{NAT_CDEPS}, etc.; see @file{Makefile.in}.
 
+@emph{Maintainer's note: The @file{.mh} suffix is because this file
+originally contained @file{Makefile} fragments for hosting @value{GDBN}
+on machine @var{xyz}.  While the file is no longer used for this
+purpose, the @file{.mh} suffix remains.  Perhaphs someone will
+eventually rename these fragments so that they have a @file{.mn}
+suffix.}
+
 @item gdb/config/@var{arch}/nm-@var{xyz}.h
 (@file{nm.h} is a link to this file, created by @code{configure}).  Contains C
 macro definitions describing the native system environment, such as
@@ -4745,6 +4758,13 @@ desired target is already available) also edit @file{gdb/configure.tgt},
 setting @code{gdb_target} to something appropriate (for instance,
 @var{xyz}).
 
+@emph{Maintainer's note: Work in progress.  The file
+@file{gdb/configure.host} originally needed to be modified when either a
+new native target or a new host machine was being added to @value{GDBN}.
+Recent changes have removed this requirement.  The file now only needs
+to be modified when adding a new native configuration.  This will likely
+changed again in the future.}
+
 @item
 Finally, you'll need to specify and define @value{GDBN}'s host-, native-, and
 target-dependent @file{.h} and @file{.c} files used for your