Index: gcc/common.opt
===================================================================
--- gcc/common.opt	(revision 246571)
+++ gcc/common.opt	(working copy)
@@ -1965,6 +1965,10 @@ fprofile
 Common Report Var(profile_flag)
 Enable basic program profiling code.
 
+fprofile-abs-path
+Common Report Var(profile_abs_path_flag)
+Generate absolute source path names for gcov.
+
 fprofile-arcs
 Common Report Var(profile_arc_flag)
 Insert arc-based program profiling code.
Index: gcc/coverage.c
===================================================================
--- gcc/coverage.c	(revision 246571)
+++ gcc/coverage.c	(working copy)
@@ -663,7 +663,7 @@ coverage_begin_function (unsigned lineno_checksum,
   gcov_write_unsigned (cfg_checksum);
   gcov_write_string (IDENTIFIER_POINTER
 		     (DECL_ASSEMBLER_NAME (current_function_decl)));
-  gcov_write_string (xloc.file);
+  gcov_write_filename (xloc.file);
   gcov_write_unsigned (xloc.line);
   gcov_write_length (offset);
 
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi	(revision 246571)
+++ gcc/doc/invoke.texi	(working copy)
@@ -441,6 +441,7 @@ Objective-C and Objective-C++ Dialects}.
 @item Program Instrumentation Options
 @xref{Instrumentation Options,,Program Instrumentation Options}.
 @gccoptlist{-p  -pg  -fprofile-arcs  --coverage  -ftest-coverage @gol
+-fprofile-abs-path @gol
 -fprofile-dir=@var{path}  -fprofile-generate  -fprofile-generate=@var{path} @gol
 -fsanitize=@var{style}  -fsanitize-recover  -fsanitize-recover=@var{style} @gol
 -fasan-shadow-offset=@var{number}  -fsanitize-sections=@var{s1},@var{s2},... @gol
@@ -10639,6 +10640,12 @@ additional @option{-ftest-coverage} option.  You d
 every source file in a program.
 
 @item
+Compile the source files additionally with @option{-fprofile-abs-path}
+to create absolute path names in the @file{.gcno} files.  This allows
+@command{gcov} to find the correct sources in projects with multiple
+directories.
+
+@item
 Link your object files with @option{-lgcov} or @option{-fprofile-arcs}
 (the latter implies the former).
 
@@ -10696,6 +10713,12 @@
 generate test coverage data.  Coverage data matches the source files
 more closely if you do not optimize.
 
+@item -fprofile-abs-path
+@opindex fprofile-abs-path
+Automatically convert relative source file names to absolute path names
+in the @file{.gcno} files.  This allows @command{gcov} to find the correct
+sources in projects with multiple directories.
+
 @item -fprofile-dir=@var{path}
 @opindex fprofile-dir
 
Index: gcc/gcov-io.c
===================================================================
--- gcc/gcov-io.c	(revision 246571)
+++ gcc/gcov-io.c	(working copy)
@@ -353,6 +353,37 @@ gcov_write_string (const char *string)
 #endif
 
 #if !IN_LIBGCOV
+/* Write FILENAME to coverage file.  Sets error flag on file
+   error, overflow flag on overflow */
+
+GCOV_LINKAGE void
+gcov_write_filename (const char *filename)
+{
+  char buf[1024];
+  size_t len;
+
+  if (profile_abs_path_flag && filename && filename[0]
+      && !(IS_DIR_SEPARATOR (filename[0])
+#if HAVE_DOS_BASED_FILE_SYSTEM
+	   || filename[1] == ':'
+#endif
+	  )
+      && (len = strlen (filename)) < sizeof (buf) - 1)
+    {
+      if (getcwd (buf, sizeof (buf) - len - 1) != NULL)
+	{
+	  if (buf[0] && !IS_DIR_SEPARATOR (buf[strlen (buf) - 1]))
+	    strcat (buf, "/");
+	  strcat (buf, filename);
+	  filename = buf;
+	}
+    }
+
+  return gcov_write_string (filename);
+}
+#endif
+
+#if !IN_LIBGCOV
 /* Write a tag TAG and reserve space for the record length. Return a
    value to be used for gcov_write_length.  */
 
Index: gcc/gcov-io.h
===================================================================
--- gcc/gcov-io.h	(revision 246571)
+++ gcc/gcov-io.h	(working copy)
@@ -388,6 +388,7 @@ GCOV_LINKAGE void gcov_write_unsigned (gcov_unsign
 /* Available only in compiler */
 GCOV_LINKAGE unsigned gcov_histo_index (gcov_type value);
 GCOV_LINKAGE void gcov_write_string (const char *);
+GCOV_LINKAGE void gcov_write_filename (const char *);
 GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t);
 GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/);
 #endif
Index: gcc/profile.c
===================================================================
--- gcc/profile.c	(revision 246571)
+++ gcc/profile.c	(working copy)
@@ -956,7 +956,7 @@ output_location (char const *file_name, int line,
 	{
 	  prev_file_name = file_name;
 	  gcov_write_unsigned (0);
-	  gcov_write_string (prev_file_name);
+	  gcov_write_filename (prev_file_name);
 	}
       if (line_differs)
 	{
Index: gcc/testsuite/gcc.misc-tests/gcov-1a.c
===================================================================
--- gcc/testsuite/gcc.misc-tests/gcov-1a.c	(revision 0)
+++ gcc/testsuite/gcc.misc-tests/gcov-1a.c	(working copy)
@@ -0,0 +1,20 @@
+/* Test Gcov basics.  */
+
+/* { dg-options "-fprofile-arcs -ftest-coverage -fprofile-abs-path" } */
+/* { dg-do run { target native } } */
+
+void noop ()
+{
+}
+
+int main ()
+{
+  int i;
+
+  for (i = 0; i < 10; i++)	/* count(11) */
+    noop ();			/* count(10) */
+
+  return 0;			/* count(1) */
+}
+
+/* { dg-final { run-gcov gcov-1a.c } } */
