2002-06-18 Phil Edwards <pme@gcc.gnu.org>

	* configure:  For in-source builds, make a subdir and re-exec there.
	* Makefile:  New file.  Pass targets through to build directory.
	* .cvsignore:  No longer ignore "Makefile".


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@54759 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 91 insertions, 2 deletions

diff --git a/.cvsignore b/.cvsignore
index e2952dc9ac3..9cd799e739a 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -26,7 +26,6 @@ configure.tps
 configure.vr
 configure.vrs
 dir.info
-Makefile
 lost+found
 update.out
 LAST_UPDATED
diff --git a/ChangeLog b/ChangeLog
index a4c8a7de662..031c6a6355b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2002-06-18  Phil Edwards  <pme@gcc.gnu.org>
+
+	* configure:  For in-source builds, make a subdir and re-exec there.
+	* Makefile:  New file.  Pass targets through to build directory.
+	* .cvsignore:  No longer ignore "Makefile".
+
 2002-06-16  Douglas Rupp  <rupp@gnat.com>
 
 	* MAINTAINERS (Write After Approval): Add self.
diff --git a/Makefile b/Makefile
new file mode 100644
index 00000000000..ff81fa5af29
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,53 @@
+#
+# Redirecting Makefile.
+#   Copyright (C) 2002 Free Software Foundation
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+# This Makefile is a red herring.  It is not normally used and it is never
+# written by 'configure' from 'Makefile.in'.  This Makefile is here to
+# support users who try to configure/build in the source directory.  It
+# simply chdir's into a subdirectory created by configure and reinvokes
+# make.  Few targets are listed because advanced users (who would use those
+# targets) are assumed to know that a separate build dir is recommended.
+
+SHELL = /bin/sh
+
+# Additional pass-through targets can be listed here.
+TARGETS=bootstrap \
+        clean \
+        install
+
+all:
+.PHONY: sanitycheck
+
+distclean:
+	test -f s-buildd || exit 0 &&  \
+	  . ./s-buildd && rm -rf $${builddir} s-buildd
+
+sanitycheck:
+	@if test ! -f s-buildd; then  \
+	  echo 'You must configure before attempting to build.';  \
+	  echo 'Please read the instructions in the INSTALL directory.';  \
+	  exit 1;  \
+	fi
+
+$(TARGETS): sanitycheck
+	(. ./s-buildd; cd $${builddir}; ${MAKE} $@)
+
+all: sanitycheck
+	(. ./s-buildd; cd $${builddir}; ${MAKE} $${defaulttarget})
+
diff --git a/configure b/configure
index d64ea3337b7..3e891d93646 100755
--- a/configure
+++ b/configure
@@ -89,7 +89,7 @@ subdirs=
 target_alias=NOTARGET
 target_makefile_frag=
 undefs=NOUNDEFS
-version="$Revision: 1.42 $"
+version="$Revision: 1.43 $"
 x11=default
 bindir='${exec_prefix}/bin'
 sbindir='${exec_prefix}/sbin'
@@ -573,6 +573,37 @@ case "${srcdir}" in
 	fi
 esac
 
+# If it's an in-source build, make a directory and configure there instead.
+# Name the build directory after the host for clarity's sake.  Remember that
+# name for the redirecting makefile's use, since the makefile shouldn't have
+# to duplicate the work of figuring out host_alias.
+#
+# Also remember if this is a native build or not.  Variations on "or not"
+# are performed later in this script so we can't test them here.  In
+# particular, build_alias will still be empty unless specified by the user,
+# so do not try in-source builds when making a host-x-host compiler.
+# For a cross compile, "make all" = "all".  Otherwise, "all" = "bootstrap".
+if test "${srcdir}" = "." ; then
+	builddir=${host_alias}
+	if test ! -d ${builddir}; then
+		mkdir ${builddir} || exit 1
+	fi
+	if test ${host_alias} != ${target_alias}; then
+		t=all
+	else
+		t=bootstrap
+	fi
+	# stamp-builddir is too long for #$&!*@ 8.3 filesystems
+	echo "builddir=${builddir}" > s-buildd
+	echo "defaulttarget=$t" >> s-buildd
+	cd ${builddir}
+echo host $host_alias
+echo target $target_alias
+echo t $t
+sleep 20
+	exec ${config_shell} ../configure $arguments
+fi
+
 ### warn about some conflicting configurations.
 
 case "${srcdir}" in