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Re: PATCH RFA: Build stages 2 and 3 with C++

From: Ian Lance Taylor <iant at google dot com>
To: David Edelsohn <dje dot gcc at gmail dot com>
Cc: gcc-patches at gcc dot gnu dot org, gcc at gcc dot gnu dot org
Date: Wed, 20 Jul 2011 13:25:14 -0700
Subject: Re: PATCH RFA: Build stages 2 and 3 with C++
References: <mcroc0u3ef5.fsf@coign.corp.google.com> <mcrei1munm0.fsf@coign.corp.google.com> <4E26E775.7070802@moene.org> <mcrd3h556y7.fsf@coign.corp.google.com> <CAGWvnyk1wmftNSi8Fp_-zAOR6+ibGmvkEr0qbrcu+TY3rQMGNw@mail.gmail.com> <mcrsjq13q5u.fsf@coign.corp.google.com> <CAGWvny=99j6jpnzrL6WzqPtt=1f_50Rn873Wtiu6DTNVszDFhQ@mail.gmail.com>

David Edelsohn <dje.gcc@gmail.com> writes:

> I now can get through the build of the compiler, but stage2 and stage3
> libstdc++ and libsupc++ files have many comparison failures due to
> tree.c:get_file_function_name() introducing explicit randomness to
> produce different symbols for anonymous namespaces:

Interesting.  I don't know why this doesn't happen on GNU/Linux.
Perhaps AIX has symbols which are dropped on GNU/Linux for some reason.

Presumably the fix will be to use -frandom-seed.  Does this patch fix
the problem?  (The only real change is to fragment.am, the other changes
are all generated by automake).

Ian

Index: fragment.am
===================================================================
--- fragment.am	(revision 176515)
+++ fragment.am	(working copy)
@@ -16,7 +16,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
 
Index: python/Makefile.in
===================================================================
--- python/Makefile.in	(revision 176515)
+++ python/Makefile.in	(working copy)
@@ -291,7 +291,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
Index: Makefile.in
===================================================================
--- Makefile.in	(revision 176515)
+++ Makefile.in	(working copy)
@@ -293,7 +293,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
Index: src/Makefile.in
===================================================================
--- src/Makefile.in	(revision 176515)
+++ src/Makefile.in	(working copy)
@@ -331,7 +331,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
Index: doc/Makefile.in
===================================================================
--- doc/Makefile.in	(revision 176515)
+++ doc/Makefile.in	(working copy)
@@ -277,7 +277,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
Index: po/Makefile.in
===================================================================
--- po/Makefile.in	(revision 176515)
+++ po/Makefile.in	(working copy)
@@ -267,7 +267,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
Index: include/Makefile.in
===================================================================
--- include/Makefile.in	(revision 176515)
+++ include/Makefile.in	(working copy)
@@ -267,7 +267,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
Index: libsupc++/Makefile.in
===================================================================
--- libsupc++/Makefile.in	(revision 176515)
+++ libsupc++/Makefile.in	(working copy)
@@ -326,7 +326,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once
Index: testsuite/Makefile.in
===================================================================
--- testsuite/Makefile.in	(revision 176515)
+++ testsuite/Makefile.in	(working copy)
@@ -270,7 +270,7 @@ toolexeclibdir = $(glibcxx_toolexeclibdi
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
-	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS)
+	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
 	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once

Follow-Ups:
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: Mike Stump
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: David Edelsohn

References:
- PATCH RFA: Build stages 2 and 3 with C++
  - From: Ian Lance Taylor
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: Ian Lance Taylor
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: Toon Moene
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: Ian Lance Taylor
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: David Edelsohn
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: Ian Lance Taylor
- Re: PATCH RFA: Build stages 2 and 3 with C++
  - From: David Edelsohn

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