[GOLD] gcc-11 stringop-overflow warning

[Alan Modra]

I'm unsure why this is deserving of a warning.  Not writing the most
efficient code surely can't be a real problem, but that is what
https://gcc.gnu.org/bugzilla//show_bug.cgi?id=88059#c1 seems to say.

plugin.cc:528:10: error: ‘char* strncpy(char*, const char*, size_t)’ specified bound depends on the length of the source argument [-Werror=stringop-overflow=]
  528 |   strncpy(tempdir, dir_template, len);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
plugin.cc:526:22: note: length computed here
  526 |   size_t len = strlen(dir_template) + 1;
      |                ~~~~~~^~~~~~~~~~~~~~

Applied as obvious, or at least, not wrong.

	* plugin.cc (Plugin_recorder::init): Replace strncpy with memcpy.

diff --git a/gold/plugin.cc b/gold/plugin.cc
index 729ddca9f3..fd37957e73 100644
--- a/gold/plugin.cc
+++ b/gold/plugin.cc
@@ -525,7 +525,7 @@ Plugin_recorder::init()
 
   size_t len = strlen(dir_template) + 1;
   char* tempdir = new char[len];
-  strncpy(tempdir, dir_template, len);
+  memcpy(tempdir, dir_template, len);
 
   // Create the log file.
   std::string logname(tempdir);

-- 
Alan Modra
Australia Development Lab, IBM