libstdc++-v3/ChangeLog:

	* python/Makefile.am (install-data-local): Use mkdirs_p for debug
	libdir.
	* python/Makefile.in: Regenerate.

The additional libraries installed by --enable-libstdcxx-debug are built
without optimization to aid debugging, but the Python pretty printers
are not installed alongside them. This means that you can step through
the unoptimized library code, but at the expense of pretty printing the
library types.

This remedies the situation by installing another copy of the GDB hooks
alongside the debug version of libstdc++.so.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* python/Makefile.am [GLIBCXX_BUILD_DEBUG] (install-data-local):
	Install another copy of the GDB hook.
	* python/Makefile.in: Regenerate.

When no shared library is installed, the new code to determine the name
of the -gdb.py file yields an empty string. Use the name of the static
library in that case.

libstdc++-v3/ChangeLog:

	PR libstdc++/99453
	* python/Makefile.am: Use archive name for printer hook if no
	dynamic library name is available.
	* python/Makefile.in: Regenerate.

In order for GDB to auto-load the pretty printers, they must be installed
as "libstdc++.$ext-gdb.py", where 'libstdc++.$ext' is the name of the
object file that is loaded by GDB [1], i.e. the libstdc++ shared library.

The approach taken in libstdc++-v3/python/Makefile.am is to loop over
files matching 'libstdc++*' in $(DESTDIR)$(toolexeclibdir) and choose
the last file matching that glob that is not a symlink, the Libtool
'*.la' file or a Python file.

That works fine for ELF targets where the matching names are:

  libstdc++.a
  libstdc++.so
  libstdc++.so.6
  libstdc++.so.6.0.29

But not for macOS with:

  libstdc++.6.dylib
  libstdc++.a

Or MinGW with:

  libstdc++-6.dll
  libstdc++.dll.a

Try to make a better job at installing the pretty printers with the
correct name by copying the approach taken by isl [2], that is, using
a sed invocation on the Libtool-generated 'libstdc++.la' to read the
correct name for the current platform.

[1] https://sourceware.org/gdb/onlinedocs/gdb/objfile_002dgdbdotext-file.html
[2] https://repo.or.cz/isl.git/blob/HEAD:/Makefile.am#l611

libstdc++-v3/ChangeLog:

	PR libstdc++/99453
	* python/Makefile.am: Install libstdc++*-gdb.py more robustly.
	* python/Makefile.in: Regenerate.

Co-authored-by: Jonathan Wakely <jwakely@redhat.com>

From-SVN: r279813