gdb/configure.ac: Add option --with-additional-debug-dirs

If you want to install GDB in a custom prefix, have it look for debug info
in that prefix but also in the distro's default location (typically,
/usr/lib/debug) and run the GDB testsuite before doing "make install", you
have a bit of a problem:

Configuring GDB with '--prefix=$PREFIX' sets the GDB 'debug-file-directory'
parameter to $PREFIX/lib/debug.  Unfortunately this precludes GDB from
looking for distro-installed debug info in /usr/lib/debug.  For regular GDB
use you could set debug-file-directory to $PREFIX:/usr/lib/debug in
$PREFIX/etc/gdbinit so that GDB will look in both places, but if you want
to run the testsuite then that doesn't help because in that case GDB runs
with the '-nx' option.

There's the configure option '--with-separate-debug-dir' to set the default
value for 'debug-file-directory', but it accepts only one directory and not
a list.  I considered modifying it to accept a list, but it's not obvious
how to do that because its value is also used by BFD, as well as processed
for "relocatability".

I thought it was simpler to add a new option to specify a list of
additional directories that will be appended to the debug-file-directory
setting.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/gdb/main.c b/gdb/main.c
index 8a1c269..2da39f8 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -718,6 +718,11 @@ captured_main_1 (struct captured_main_args *context)
   debug_file_directory
     = relocate_gdb_directory (DEBUGDIR, DEBUGDIR_RELOCATABLE);
 
+#ifdef ADDITIONAL_DEBUG_DIRS
+  debug_file_directory = (debug_file_directory + DIRNAME_SEPARATOR
+			  + ADDITIONAL_DEBUG_DIRS);
+#endif
+
   gdb_datadir = relocate_gdb_directory (GDB_DATADIR,
 					GDB_DATADIR_RELOCATABLE);