[gcc r13-6955] c++tools: Fix Makefile to properly clean and rebuild [PR101834]

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:79d1e0b2c2b8ff4f4b1118549a80945faa1cb356

commit r13-6955-g79d1e0b2c2b8ff4f4b1118549a80945faa1cb356
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Mar 30 13:03:11 2023 +0100

    c++tools: Fix Makefile to properly clean and rebuild [PR101834]
    
    The c++tools makefile doesn't remove progressively more files in each of
    mostlyclean, clean, and distclean. Instead, each removes a different set
    of files (and some files are not removed by any target). Use
    prerequisites so that everything is removed.
    
    Also, building in the $objdir/c++tools directory doesn't work, because
    the INSTALL variable is never set. It works when building from the
    top-level because INSTALL is set in the environment when recursively
    invoking make for sub-directories.
    
    c++tools/ChangeLog:
    
            PR bootstrap/101834
            * Makefile.in (INSTALL): Set variable.
            (mostlyclean): Mark as a phony target.
            (clean): Add mostlyclean as a prerequisite.
            (distclean): Add clean as a prerequisite and remove more files.
            (maintainer-clean): Add distclean as a prerequisite.

Diff:
---
 c++tools/Makefile.in | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/c++tools/Makefile.in b/c++tools/Makefile.in
index 56cba090135..77bda3d56dc 100644
--- a/c++tools/Makefile.in
+++ b/c++tools/Makefile.in
@@ -22,6 +22,7 @@ libexecdir := @libexecdir@
 target_noncanonical := @target_noncanonical@
 gcc_version := $(shell @get_gcc_base_ver@ $(srcdir)/../gcc/BASE-VER)
 libexecsubdir := $(libexecdir)/gcc/$(target_noncanonical)/$(gcc_version)
+INSTALL := @INSTALL@
 INSTALL_PROGRAM := @INSTALL_PROGRAM@
 INSTALL_STRIP_PROGRAM := $(srcdir)/../install-sh -c -s
 AUTOCONF := @AUTOCONF@
@@ -41,13 +42,14 @@ all::
 mostlyclean::
 	rm -f $(MAPPER.O)
 
-clean::
+clean:: mostlyclean
 	rm -f g++-mapper-server$(exeext)
 
-distclean::
-	rm -f config.log config.status config.h
+distclean:: clean
+	rm -f config.log config.status config.h config.cache Makefile
+	rm -f $(MAPPER.O:%.o=%.d)
 
-maintainer-clean::
+maintainer-clean:: distclean
 
 install::
 
@@ -132,6 +134,6 @@ config.h: config.status config.h.in
 config.status: $(srcdir)/configure $(srcdir)/config.h.in
 	if test -x $@; then ./$@ -recheck; else $< @configure_args@; fi
 
-.PHONY: all check clean distclean maintainer-clean
+.PHONY: all check mostlyclean clean distclean maintainer-clean
 
 -include $(MAPPER.O:.o=.d)