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.
