[PATCH] Append PWD to path when using -fprofile-generate=/some/path.

["Martin Liška" <mliska@suse.cz>]

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Hello.

It's improvement that I consider still useful even though we're not going to use
it for profiled bootstrap.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.

Ready for trunk?
Thanks,
Martin

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From 1a32e0b41b291bef3d58126754834f6c41148ace Mon Sep 17 00:00:00 2001
From: marxin <mliska@suse.cz>
Date: Wed, 16 Aug 2017 10:22:57 +0200
Subject: [PATCH] Append PWD to path when using -fprofile-generate=/some/path.

gcc/ChangeLog:

2017-10-27  Martin Liska  <mliska@suse.cz>

	* coverage.c (coverage_init): Append absolute path of object
	file.
	* doc/invoke.texi: Document the behavior.
---
 gcc/coverage.c      | 20 ++++++++++++++++++--
 gcc/doc/invoke.texi |  3 +++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/gcc/coverage.c b/gcc/coverage.c
index 8a56a677f15..c66651f1045 100644
--- a/gcc/coverage.c
+++ b/gcc/coverage.c
@@ -1220,8 +1220,24 @@ coverage_init (const char *filename)
     g->get_passes ()->get_pass_profile ()->static_pass_number;
   g->get_dumps ()->dump_start (profile_pass_num, NULL);
 
-  if (!profile_data_prefix && !IS_ABSOLUTE_PATH (filename))
-    profile_data_prefix = getpwd ();
+  if (!IS_ABSOLUTE_PATH (filename))
+    {
+      if (profile_data_prefix)
+	{
+	  const char *pwd = getpwd ();
+	  unsigned l1 = strlen (profile_data_prefix);
+	  unsigned l2 = strlen (pwd);
+
+	  char *b = XNEWVEC (char, l1 + l2 + 2);
+	  memcpy (b, profile_data_prefix, l1);
+	  b[l1] = '/';
+	  memcpy (b + l1 + 1, pwd, l2);
+	  b[l1 + l2 + 1] = '\0';
+	  profile_data_prefix = b;
+	}
+      else
+	profile_data_prefix = getpwd ();
+    }
 
   if (profile_data_prefix)
     prefix_len = strlen (profile_data_prefix);
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 71b2445f70f..682ab570584 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -10915,6 +10915,9 @@ and used by @option{-fprofile-use} and @option{-fbranch-probabilities}
 and its related options.  Both absolute and relative paths can be used.
 By default, GCC uses the current directory as @var{path}, thus the
 profile data file appears in the same directory as the object file.
+In order to prevent filename clashing, if object file name is not an absolute
+path, current working directory path is appended to @var{path}
+and used as a destination for @file{@var{sourcename}.gcda} file.
 
 @item -fprofile-generate
 @itemx -fprofile-generate=@var{path}
-- 
2.14.2