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[PATCH, committed] Re: toplevel out of sync


On 26/05/2010 06:09, Dave Korn wrote:
> On 26/05/2010 05:58, Dave Korn wrote:
>> On 25/05/2010 18:33, Ralf Wildenhues wrote:
>>
>>> bcd70fb06d56d9316d49019f5c0a3109def08d39   158763
>>> a9ed67d000f285282e61aa9b87cc8d992a8731df   158762
>>   I'm responsible for those two, and I'm copying them across right now; sorry
>> for forgetting.
> 
>   And while I'm at it, I'll take care of these two as well:
> 
>> 17281d1ee17f204064cfcbcc82089aefa19e3779   159527
>> 401f30d69e280e18a9581b819376d18786595d3b   159173
> 
> ... since they're one-liner additions to the section I'm synching.

  I've synched across the above-mentioned GCC revisions to the top-level
configure.ac script in /src, with the following ChangeLog:

2010-05-26  Dave Korn  <dave.korn.cygwin AT gmail.com>

	Merge from gcc:

	2010-05-18  Steven Bosscher  <steven AT gcc.gnu.org>
	* configure.ac (--enable-lto): All *-apple-darwin* now support LTO.
	* configure: Regenerate.

	2010-05-07  Steven Bosscher  <steven AT gcc.gnu.org>
	* configure.ac (--enable-lto): Add x86_64-apple-darwin* as
	a platform that supports LTO.
	* configure: Regenerate.

	2010-04-27  Dave Korn  <dave.korn.cygwin AT gmail.com>
	PR lto/42776
	* configure.ac (--enable-lto): Refactor handling so libelf tests
	are only performed inside then-clause of ACX_ELF_TARGET_IFELSE,
	and allow LTO to be explicitly enabled on non-ELF platforms that
	are known to support it inside else-clause.
	* configure: Regenerate.

  Committed after building and testing binutils on i686-pc-cygwin just to make
sure nothing went wrong in the merge.

    cheers,
      DaveK

Index: configure.ac
===================================================================
RCS file: /cvs/src/src/configure.ac,v
retrieving revision 1.102
diff -p -u -r1.102 configure.ac
--- configure.ac	27 Apr 2010 14:24:37 -0000	1.102
+++ configure.ac	26 May 2010 04:54:16 -0000
@@ -1651,17 +1651,8 @@ AC_ARG_ENABLE(lto,
 enable_lto=$enableval,
 enable_lto=yes; default_enable_lto=yes)
 
-ACX_ELF_TARGET_IFELSE([],
-if test x"$default_enable_lto" = x"yes" ; then
-  enable_lto=no
-else
-  if test x"$enable_lto" = x"yes"; then
-    AC_MSG_ERROR([LTO support requires an ELF target.])
-  fi
-fi
-default_enable_lto=no)
 
-if test x"$enable_lto" = x"yes" ; then
+ACX_ELF_TARGET_IFELSE([if test x"$enable_lto" = x"yes" ; then
   # Make sure that libelf.h and gelf.h are available.
   AC_ARG_WITH(libelf, [  --with-libelf=PATH       Specify prefix directory for the installed libelf package
                           Equivalent to --with-libelf-include=PATH/include
@@ -1777,7 +1768,25 @@ to specify its location.])
   # Flags needed for libelf.
   AC_SUBST(libelflibs)
   AC_SUBST(libelfinc)
-fi
+fi],[if test x"$default_enable_lto" = x"yes" ; then
+    # On non-ELF platforms, LTO must be explicitly enabled.
+    enable_lto=no
+  else
+  # Apart from ELF platforms, only Windows supports LTO so far.  It
+  # would also be nice to check the binutils support, but we don't
+  # have gcc_GAS_CHECK_FEATURE available here.  For now, we'll just
+  # warn during gcc/ subconfigure; unless you're bootstrapping with
+  # -flto it won't be needed until after installation anyway.
+    case $target in
+      *-cygwin*|*-mingw*) ;;
+      *-apple-darwin*) ;;
+      *) if test x"$enable_lto" = x"yes"; then
+	AC_MSG_ERROR([LTO support is not enabled for this target.])
+        fi
+      ;;
+    esac
+  fi
+  default_enable_lto=no])
 
 
 # By default, C is the only stage 1 language.

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