changeset:   100447:61f8f7610a88
branch:      3.5
parent:      100444:a6b07ad3d14d
user:        Ned Deily <nad@python.org>
date:        Tue Mar 08 00:28:37 2016 -0500
files:       Misc/NEWS aclocal.m4 configure configure.ac
description:
Issue #24324: Do not enable unreachable code warnings when using
gcc as the option does not work correctly in older versions of gcc
and has been silently removed as of gcc-4.5.


diff -r a6b07ad3d14d -r 61f8f7610a88 Misc/NEWS
--- a/Misc/NEWS	Mon Mar 07 14:51:59 2016 -0500
+++ b/Misc/NEWS	Tue Mar 08 00:28:37 2016 -0500
@@ -310,6 +310,10 @@
 
 - Issue #25136: Support Apple Xcode 7's new textual SDK stub libraries.
 
+- Issue #24324: Do not enable unreachable code warnings when using
+  gcc as the option does not work correctly in older versions of gcc
+  and has been silently removed as of gcc-4.5.
+
 Windows
 -------
 
diff -r a6b07ad3d14d -r 61f8f7610a88 aclocal.m4
--- a/aclocal.m4	Mon Mar 07 14:51:59 2016 -0500
+++ b/aclocal.m4	Tue Mar 08 00:28:37 2016 -0500
@@ -1,6 +1,6 @@
-# generated automatically by aclocal 1.14.1 -*- Autoconf -*-
+# generated automatically by aclocal 1.15 -*- Autoconf -*-
 
-# Copyright (C) 1996-2013 Free Software Foundation, Inc.
+# Copyright (C) 1996-2014 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff -r a6b07ad3d14d -r 61f8f7610a88 configure
--- a/configure	Mon Mar 07 14:51:59 2016 -0500
+++ b/configure	Tue Mar 08 00:28:37 2016 -0500
@@ -6963,15 +6963,24 @@
 
      CFLAGS="$save_CFLAGS"
      CC="$ac_save_cc"
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_enable_unreachable_code_warning" >&5
-$as_echo "$ac_cv_enable_unreachable_code_warning" >&6; }
 
     # Don't enable unreachable code warning in debug mode, since it usually
     # results in non-standard code paths.
-    if test $ac_cv_enable_unreachable_code_warning = yes && test "$Py_DEBUG" != "true"
+    # Issue #24324: Unfortunately, the unreachable code warning does not work
+    # correctly on gcc and has been silently removed from the compiler.
+    # It is supported on clang but on OS X systems gcc may be an alias
+    # for clang.  Try to determine if the compiler is not really gcc and,
+    # if so, only then enable the warning.
+    if test $ac_cv_enable_unreachable_code_warning = yes && \
+        test "$Py_DEBUG" != "true" && \
+        test -z "`$CC --version 2>/dev/null | grep 'Free Software Foundation'`"
     then
       BASECFLAGS="$BASECFLAGS -Wunreachable-code"
+    else
+      ac_cv_enable_unreachable_code_warning=no
     fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_enable_unreachable_code_warning" >&5
+$as_echo "$ac_cv_enable_unreachable_code_warning" >&6; }
 
     # if using gcc on alpha, use -mieee to get (near) full IEEE 754
     # support.  Without this, treatment of subnormals doesn't follow
diff -r a6b07ad3d14d -r 61f8f7610a88 configure.ac
--- a/configure.ac	Mon Mar 07 14:51:59 2016 -0500
+++ b/configure.ac	Tue Mar 08 00:28:37 2016 -0500
@@ -1483,14 +1483,23 @@
 	 ]))
      CFLAGS="$save_CFLAGS"
      CC="$ac_save_cc"
-    AC_MSG_RESULT($ac_cv_enable_unreachable_code_warning)
 
     # Don't enable unreachable code warning in debug mode, since it usually
     # results in non-standard code paths.
-    if test $ac_cv_enable_unreachable_code_warning = yes && test "$Py_DEBUG" != "true"
+    # Issue #24324: Unfortunately, the unreachable code warning does not work
+    # correctly on gcc and has been silently removed from the compiler.
+    # It is supported on clang but on OS X systems gcc may be an alias
+    # for clang.  Try to determine if the compiler is not really gcc and,
+    # if so, only then enable the warning.
+    if test $ac_cv_enable_unreachable_code_warning = yes && \
+        test "$Py_DEBUG" != "true" && \
+        test -z "`$CC --version 2>/dev/null | grep 'Free Software Foundation'`"
     then
       BASECFLAGS="$BASECFLAGS -Wunreachable-code"
+    else
+      ac_cv_enable_unreachable_code_warning=no
     fi
+    AC_MSG_RESULT($ac_cv_enable_unreachable_code_warning)
 
     # if using gcc on alpha, use -mieee to get (near) full IEEE 754
     # support.  Without this, treatment of subnormals doesn't follow