re PR bootstrap/41529 (LTO configuration should detect if the target is ELF)

2010-01-02  Richard Guenther  <rguenther@suse.de>

	PR lto/41529
	* configure.ac: Include config/elf.m4.  Disable LTO if not
	builting for an elf target.
	* configure: Regenerate.

	config/
	* elf.m4: New file.

From-SVN: r155565

5 files changed, 79 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index aa1bbab..b346eeb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2010-01-02  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/41529
+	* configure.ac: Include config/elf.m4.  Disable LTO if not
+	builting for an elf target.
+	* configure: Regenerate.
+
 2009-12-27  Christopher Faylor  <me+cygwin@cgf.cx>
 
 	* MAINTAINERS: Change my email address.
diff --git a/config/ChangeLog b/config/ChangeLog
index 9e524fc..a881349 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,3 +1,8 @@
+2010-01-02  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/41529
+	* elf.m4: New file.
+
 2009-11-30  Joseph Myers  <joseph@codesourcery.com>
 
 	* largefile.m4 (ACX_LARGEFILE): Require AC_CANONICAL_HOST and
diff --git a/config/elf.m4 b/config/elf.m4
new file mode 100644
index 0000000..44d0249
--- /dev/null
+++ b/config/elf.m4
@@ -0,0 +1,27 @@
+dnl Copyright (C) 2010 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+dnl From Paolo Bonzini.
+
+dnl usage: ACX_ELF_TARGET_IFELSE([if-elf], [if-not-elf])
+AC_DEFUN([ACX_ELF_TARGET_IFELSE], [
+AC_REQUIRE([AC_CANONICAL_TARGET])
+
+target_elf=no
+case $target in
+  *-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
+  *-msdosdjgpp* | *-netware* | *-vms* | *-wince* | *-*-pe* | \
+  alpha*-dec-osf* | *-interix*)
+    target_elf=no
+    ;;
+  *)
+    target_elf=yes
+    ;;
+esac
+
+AS_IF([test $target_elf = yes], [$1], [$2])
+])
diff --git a/configure b/configure
index 0223683..f1df3a5 100755
--- a/configure
+++ b/configure
@@ -5889,6 +5889,35 @@ else
 fi
 
 
+
+
+
+target_elf=no
+case $target in
+  *-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
+  *-msdosdjgpp* | *-netware* | *-vms* | *-wince* | *-*-pe* | \
+  alpha*-dec-osf* | *-interix*)
+    target_elf=no
+    ;;
+  *)
+    target_elf=yes
+    ;;
+esac
+
+if test $target_elf = yes; then :
+
+else
+  if test x"$default_enable_lto" = x"yes" ; then
+  enable_lto=no
+else
+  if test x"$enable_lto" = x"yes"; then
+    as_fn_error "LTO support requires an ELF target." "$LINENO" 5
+  fi
+fi
+default_enable_lto=no
+fi
+
+
 if test x"$enable_lto" = x"yes" ; then
   # Make sure that libelf.h and gelf.h are available.
 
diff --git a/configure.ac b/configure.ac
index dbc1565..9a71232 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,6 +22,7 @@
 m4_include(config/acx.m4)
 m4_include(config/override.m4)
 m4_include(config/proginstall.m4)
+m4_include(config/elf.m4)
 
 AC_INIT(move-if-change)
 AC_PREREQ(2.64)
@@ -1601,6 +1602,16 @@ 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
   # 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