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[PATCH] RFC: enable pretty printers for --enable-libstdcxx-debug libs


The --enable-libstdcxx-debug option builds extra versions of libstdc++
without optimisation and installs them in $libdir/debug, which can be
used via RPATH or LD_LIBRARY_PATH. However, there's no gdb.py
installed alongside those debug versions of the libs, so while you can
step into unoptimised libstdc++ code in GDB, you can't use the pretty
printers.

This patch installs a symlink in $libdir/debug pointing to the gdb.py
file in the parent dir, and adjusts the gdb.py file to handle the
$libdir/debug case. This seems to work. An alternative would be to
install a modified copy of the gdb.py file specific to that directory,
instead of a symlink to a file that works for either case.

Better ideas are welcome.


commit b4c640fed872eba973b6ca29326856b5a3101c39
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jun 22 16:14:24 2017 +0100

    possible fix

diff --git a/libstdc++-v3/python/Makefile.am b/libstdc++-v3/python/Makefile.am
index 80790e2..6090ffe 100644
--- a/libstdc++-v3/python/Makefile.am
+++ b/libstdc++-v3/python/Makefile.am
@@ -29,6 +29,12 @@ else
 pythondir = $(datadir)/gcc-$(gcc_version)/python
 endif
 
+if GLIBCXX_BUILD_DEBUG
+LINK_DEBUG = -$(LN_S) ../$$libname-gdb.py $(DESTDIR)$(toolexeclibdir)/debug/
+else
+LINK_DEBUG =
+endif
+
 all-local: gdb.py
 
 nobase_python_DATA = \
@@ -62,3 +68,5 @@ install-data-local: gdb.py
 	cd $$here; \
 	echo " $(INSTALL_DATA) gdb.py $(DESTDIR)$(toolexeclibdir)/$$libname-gdb.py"; \
 	$(INSTALL_DATA) gdb.py $(DESTDIR)$(toolexeclibdir)/$$libname-gdb.py
+	$(LINK_DEBUG)
+
diff --git a/libstdc++-v3/python/hook.in b/libstdc++-v3/python/hook.in
index b82604a6c..7701415 100644
--- a/libstdc++-v3/python/hook.in
+++ b/libstdc++-v3/python/hook.in
@@ -50,6 +50,8 @@ if gdb.current_objfile () is not None:
     dotdots = ('..' + os.sep) * len (libdir.split (os.sep))
 
     objfile = gdb.current_objfile ().filename
+    if str (os.path.dirname (objfile)).endswith (libdir + os.sep + "debug"):
+        dotdots = dotdots + ('..' + os.sep)
     dir_ = os.path.join (os.path.dirname (objfile), dotdots, pythondir)
 
     if not dir_ in sys.path:

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