[Emacs-diffs] emacs-24 r117264: Port to GCC 4.9.0 with link time optimization.

[Paul Eggert]

------------------------------------------------------------
revno: 117264
revision-id: address@hidden
parent: address@hidden
fixes bug: http://debbugs.gnu.org/17806
committer: Paul Eggert <address@hidden>
branch nick: emacs-24
timestamp: Thu 2014-06-19 23:07:47 -0700
message:
  Port to GCC 4.9.0 with link time optimization.
  
  * configure.ac (CFLAGS): With link time optimization,
  use -ffat-lto-objects if supported; otherwise Emacs won't
  build with GCC 4.9.0.
modified:
  ChangeLog                      changelog-20091113204419-o5vbwnq5f7feedwu-1538
  configure.ac                   
configure.in-20091113204419-o5vbwnq5f7feedwu-783

=== modified file 'ChangeLog'
--- a/ChangeLog 2014-06-14 20:24:08 +0000
+++ b/ChangeLog 2014-06-20 06:07:47 +0000
@@ -1,3 +1,10 @@
+2014-06-20  Paul Eggert  <address@hidden>
+
+       Port to GCC 4.9.0 with link time optimization (Bug#17806).
+       * configure.ac (CFLAGS): With link time optimization,
+       use -ffat-lto-objects if supported; otherwise Emacs won't
+       build with GCC 4.9.0.
+
 2014-06-14  Paul Eggert  <address@hidden>
 
        Port part of the AIX fix to Solaris (Bug#17598).

=== modified file 'configure.ac'
--- a/configure.ac      2014-06-14 20:24:08 +0000
+++ b/configure.ac      2014-06-20 06:07:47 +0000
@@ -777,6 +777,12 @@
    AC_MSG_RESULT([$ac_lto_supported])
    if test "$ac_lto_supported" = "yes"; then
       CFLAGS="$CFLAGS $LTO"
+      dnl The following is needed for GCC 4.9.0.  The GCC 4.9.0 release notes
+      dnl suggest that instead of -ffat-lto-objects we should use gcc-ar and
+      dnl gcc-ranlib in place of ar and ranlib, but gcc-ar makes /usr/bin/ar
+      dnl dump core on Fedora 20, so play it safe for now.
+      gl_COMPILER_OPTION_IF([-ffat-lto-objects],
+       [CFLAGS="$CFLAGS -ffat-lto-objects"])
    fi
 fi)