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diff -ur a/gdb/main.c b/gdb/main.c
--- a/gdb/main.c 2020-02-08 13:50:14.000000000 +0100
+++ b/gdb/main.c 2020-02-24 10:02:07.731806739 +0100
@@ -567,9 +567,17 @@
gdb_sysroot = xstrdup (TARGET_SYSROOT_PREFIX);
}
- debug_file_directory
- = xstrdup (relocate_gdb_directory (DEBUGDIR,
- DEBUGDIR_RELOCATABLE).c_str ());
+ debug_file_directory = getenv ("NIX_DEBUG_INFO_DIRS");
+ if (debug_file_directory != NULL)
+ // This might be updated later using
+ // $ set debug-file-directory /to/some/path
+ // which will use xfree. We must then have a xmallocated
+ // copy of the string that can be xfeed later.
+ debug_file_directory = xstrdup (debug_file_directory);
+ else
+ debug_file_directory
+ = xstrdup (relocate_gdb_directory (DEBUGDIR,
+ DEBUGDIR_RELOCATABLE).c_str ());
gdb_datadir = relocate_gdb_directory (GDB_DATADIR,
GDB_DATADIR_RELOCATABLE);
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