re PR libstdc++/40289 (share/libstdc++/python/ pollutes common namespace)

	PR libstdc++/40289:
	* python/Makefile.in: Rebuild.
	* python/hook.in: Compute module path relative to objfile.
	* python/Makefile.am (pythondir): Redefine.
	(gdb.py): Subst toolexeclibdir.
	(install-data-local): Rewrite.

From-SVN: r148357

libstdc++-v3/ChangeLog

+2009-06-10  Tom Tromey  <tromey@redhat.com>
+
+	PR libstdc++/40289:
+	* python/Makefile.in: Rebuild.
+	* python/hook.in: Compute module path relative to objfile.
+	* python/Makefile.am (pythondir): Redefine.
+	(gdb.py): Subst toolexeclibdir.
+	(install-data-local): Rewrite.
+
 2009-06-09  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* include/bits/move.h: Doxygen group fixes.

libstdc++-v3/python/Makefile.am

@@ -24,7 +24,7 @@
 include $(top_srcdir)/fragment.am
 
 ## Where to install the module code.
-pythondir = $(pkgdatadir)/python
+pythondir = $(datadir)/gcc-$(gcc_version)/python
 
 all-local: gdb.py
 
@@ -34,10 +34,27 @@ nobase_python_DATA = \
     libstdcxx/__init__.py
 
 gdb.py: hook.in Makefile
-	sed -e 's,@dir@,$(pythondir),' < $(srcdir)/hook.in > $@
+	sed -e 's,@pythondir@,$(pythondir),' \
+	    -e 's,@toolexeclibdir@,$(toolexeclibdir),' < $(srcdir)/hook.in > $@
 
 install-data-local: gdb.py
 	@$(mkdir_p) $(DESTDIR)$(toolexeclibdir)
-	@libname=`cd $(toolexeclibdir) && ls -r libstdc++* | fgrep -v gdb.py | sed 1q`; \
+## We want to install gdb.py as SOMETHING-gdb.py.  SOMETHING is the
+## full name of the final library.  We want to ignore symlinks, the
+## .la file, and any previous -gdb.py file.  This is inherently
+## fragile, but there does not seem to be a better option, because
+## libtool hides the real names from us.
+	@here=`pwd`; cd $(toolexeclibdir); \
+	  for file in libstdc++*; do \
+	    case $$file in \
+	      *-gdb.py) ;; \
+	      *.la) ;; \
+	      *) if test -h $$file; then \
+	           continue; \
+	         fi; \
+	         libname=$$file;; \
+	    esac; \
+	  done; \
+	cd $$here; \
 	echo " $(INSTALL_DATA) gdb.py $(DESTDIR)$(toolexeclibdir)/$$libname-gdb.py"; \
 	$(INSTALL_DATA) gdb.py $(DESTDIR)$(toolexeclibdir)/$$libname-gdb.py

libstdc++-v3/python/Makefile.in

@@ -298,7 +298,7 @@ WARN_CXXFLAGS = \
 
 # -I/-D flags to pass when compiling.
 AM_CPPFLAGS = $(GLIBCXX_INCLUDES)
-pythondir = $(pkgdatadir)/python
+pythondir = $(datadir)/gcc-$(gcc_version)/python
 nobase_python_DATA = \
     libstdcxx/v6/printers.py \
     libstdcxx/v6/__init__.py \
@@ -492,11 +492,23 @@ uninstall-am: uninstall-info-am uninstall-nobase_pythonDATA
 all-local: gdb.py
 
 gdb.py: hook.in Makefile
-	sed -e 's,@dir@,$(pythondir),' < $(srcdir)/hook.in > $@
+	sed -e 's,@pythondir@,$(pythondir),' \
+	    -e 's,@toolexeclibdir@,$(toolexeclibdir),' < $(srcdir)/hook.in > $@
 
 install-data-local: gdb.py
 	@$(mkdir_p) $(DESTDIR)$(toolexeclibdir)
-	@libname=`cd $(toolexeclibdir) && ls -r libstdc++* | fgrep -v gdb.py | sed 1q`; \
+	@here=`pwd`; cd $(toolexeclibdir); \
+	  for file in libstdc++*; do \
+	    case $$file in \
+	      *-gdb.py) ;; \
+	      *.la) ;; \
+	      *) if test -h $$file; then \
+	           continue; \
+	         fi; \
+	         libname=$$file;; \
+	    esac; \
+	  done; \
+	cd $$here; \
 	echo " $(INSTALL_DATA) gdb.py $(DESTDIR)$(toolexeclibdir)/$$libname-gdb.py"; \
 	$(INSTALL_DATA) gdb.py $(DESTDIR)$(toolexeclibdir)/$$libname-gdb.py
 # Tell versions [3.59,3.63) of GNU make to not export all variables.

libstdc++-v3/python/hook.in

@@ -16,9 +16,37 @@
 
 import sys
 import gdb
+import os
+import os.path
+
+pythondir = '@pythondir@'
+libdir = '@toolexeclibdir@'
+
+# Update module path.  We want to find the relative path from libdir
+# to pythondir, and then we want to apply that relative path to the
+# directory holding the objfile with which this file is associated.
+# This preserves relocatability of the gcc tree.
+
+# Do a simple normalization that removes duplicate separators.
+pythondir = os.path.join (*['/'] + pythondir.split (os.sep))
+libdir = os.path.join (*['/'] + libdir.split (os.sep))
+
+prefix = os.path.commonprefix ([libdir, pythondir])
+# In some bizarre configuration we might have found a match in the
+# middle of a directory name.
+if prefix[-1] != '/':
+    prefix = os.path.dirname (prefix)
+
+# Strip off the prefix.
+pythondir = pythondir[len (prefix):]
+libdir = libdir[len (prefix):]
+
+# Compute the ".."s needed to get from libdir to the prefix.
+dotdots = ('..' + os.sep) * len (libdir.split (os.sep))
+
+objfile = gdb.current_objfile ().filename
+dir = os.path.join (os.path.dirname (objfile), dotdots, pythondir)
 
-# Update module path.
-dir = '@dir@'
 if not dir in sys.path:
     sys.path.insert(0, dir)