[binutils-gdb] Use exec_file_find to prepend gdb_sysroot in follow_exec

[Gary Benson <gary at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ff862be47e7acf51e4abaf0f121d5961adb1845a

commit ff862be47e7acf51e4abaf0f121d5961adb1845a
Author: Gary Benson <gbenson@redhat.com>
Date:   Tue Apr 28 12:21:32 2015 +0100

    Use exec_file_find to prepend gdb_sysroot in follow_exec
    
    This commit updates follow_exec to use exec_file_find to prefix
    the new executable's filename with gdb_sysroot rather than doing
    it longhand.
    
    gdb/ChangeLog:
    
    	* infrun.c (solist.h): New include.
    	(follow_exec): Use exec_file_find to prefix execd_pathname
    	with gdb_sysroot.

Diff:
---
 gdb/ChangeLog |  6 ++++++
 gdb/infrun.c  | 18 +++++++++++-------
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index d833876..a22b7f8 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2015-04-28  Gary Benson <gbenson@redhat.com>
+
+	* infrun.c (solist.h): New include.
+	(follow_exec): Use exec_file_find to prefix execd_pathname
+	with gdb_sysroot.
+
 2015-04-28  Patrick Palka  <patrick@parcs.ath.cx>
 
 	* tui/tui-source.c (tui_set_source_content): Avoid calling
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 7870f70..f09e2da 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -60,6 +60,7 @@
 #include "target-descriptions.h"
 #include "target-dcache.h"
 #include "terminal.h"
+#include "solist.h"
 
 /* Prototypes for local functions */
 
@@ -1133,15 +1134,18 @@ follow_exec (ptid_t ptid, char *execd_pathname)
 
   breakpoint_init_inferior (inf_execd);
 
-  if (gdb_sysroot && *gdb_sysroot)
+  if (gdb_sysroot != NULL && *gdb_sysroot != '\0')
     {
-      char *name = alloca (strlen (gdb_sysroot)
-			    + strlen (execd_pathname)
-			    + 1);
+      int fd = -1;
+      char *name;
 
-      strcpy (name, gdb_sysroot);
-      strcat (name, execd_pathname);
-      execd_pathname = name;
+      name = exec_file_find (execd_pathname, &fd);
+      if (fd >= 0)
+	close (fd);
+
+      execd_pathname = alloca (strlen (name) + 1);
+      strcpy (execd_pathname, name);
+      xfree (name);
     }
 
   /* Reset the shared library package.  This ensures that we get a