[gcc r14-1901] gcc-ar: Remove code duplication.

[gcc r14-1901] gcc-ar: Remove code duplication.

[Jeff Law]

https://gcc.gnu.org/g:c2b1cbb5f177c5f2f39592dd30c21f0fd03899ad

commit r14-1901-gc2b1cbb5f177c5f2f39592dd30c21f0fd03899ad
Author: Costas Argyris <costas.argyris@gmail.com>
Date:   Sat Jun 17 14:37:01 2023 -0600

    gcc-ar: Remove code duplication.
    
    From c3f3b2fd53291805b5d0be19df6d1a348c5889ec Mon Sep 17 00:00:00 2001
    From: Costas Argyris <costas.argyris@gmail.com>
    Date: Thu, 15 Jun 2023 12:37:35 +0100
    Subject: [PATCH] gcc-ar: Remove code duplication.
    
    Preparatory refactoring that simplifies by eliminating
    some duplicated code, before trying to fix 77576.
    I believe this stands on its own regardless of the PR.
    It also saves a nargv element when we have a plugin and
    three when not.
    
    gcc/
            * gcc-ar.cc (main): Refactor to slightly reduce code
            duplication.  Avoid unnecessary elements in nargv.

Diff:
---
 gcc/gcc-ar.cc | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/gcc/gcc-ar.cc b/gcc/gcc-ar.cc
index 5e5b63e1988..4e4c525927d 100644
--- a/gcc/gcc-ar.cc
+++ b/gcc/gcc-ar.cc
@@ -128,6 +128,9 @@ main (int ac, char **av)
   const char *exe_name;
 #if HAVE_LTO_PLUGIN > 0
   char *plugin;
+  const int j = 2; /* Two extra args, --plugin <plugin>  */
+#else
+  const int j = 0; /* No extra args.  */
 #endif
   int k, status, err;
   const char *err_msg;
@@ -206,25 +209,21 @@ main (int ac, char **av)
 	}
     }
 
+  /* Prepend - if necessary.  */
+  if (is_ar && av[1] && av[1][0] != '-')
+    av[1] = concat ("-", av[1], NULL);
+  
   /* Create new command line with plugin - if we have one, otherwise just
      copy the command through.  */
-  nargv = XCNEWVEC (const char *, ac + 4);
+  nargv = XCNEWVEC (const char *, ac + j + 1); /* +j plugin args +1 for NULL.  */
   nargv[0] = exe_name;
 #if HAVE_LTO_PLUGIN > 0
   nargv[1] = "--plugin";
   nargv[2] = plugin;
-  if (is_ar && av[1] && av[1][0] != '-')
-    av[1] = concat ("-", av[1], NULL);
-  for (k = 1; k < ac; k++)
-    nargv[2 + k] = av[k];
-  nargv[2 + k] = NULL;
-#else
-  if (is_ar && av[1] && av[1][0] != '-')
-    av[1] = concat ("-", av[1], NULL);
-  for (k = 1; k < ac; k++)
-    nargv[k] = av[k];
-  nargv[k] = NULL;
 #endif
+  for (k = 1; k < ac; k++)
+    nargv[j + k] = av[k];
+  nargv[j + k] = NULL;
 
   /* Run utility */
   /* ??? the const is misplaced in pex_one's argv? */