Clear hardware capabilities on libitm.so with Sun ld

	* clearcap.map: New file.
	* acinclude.m4 (LIBITM_CHECK_LINKER_HWCAP): New test.
	* configure.ac: Call it.
	Clear HWCAP_LDFLAGS if defaulting to -mavx.
	* Makefile.am (AM_LDFLAGS): Add $(HWCAP_LDFLAGS)
	* configure: Regenerate.
	* Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@183430 138bc75d-0d04-0410-961f-82ee72b054a4

8 files changed, 177 insertions, 9 deletions

diff --git a/libitm/ChangeLog b/libitm/ChangeLog
index c6874485823..2b5e1f404be 100644
--- a/libitm/ChangeLog
+++ b/libitm/ChangeLog
@@ -1,3 +1,14 @@
+2012-01-23  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* clearcap.map: New file.
+	* acinclude.m4 (LIBITM_CHECK_LINKER_HWCAP): New test.
+	* configure.ac: Call it.
+	Clear HWCAP_LDFLAGS if defaulting to -mavx.
+	* Makefile.am (AM_LDFLAGS): Add $(HWCAP_LDFLAGS)
+	* configure: Regenerate.
+	* Makefile.in: Regenerate.
+	* testsuite/Makefile.in: Regenerate.
+
 2012-01-17  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	PR libitm/51173
diff --git a/libitm/Makefile.am b/libitm/Makefile.am
index b4ee5a84a19..f1c351c21d5 100644
--- a/libitm/Makefile.am
+++ b/libitm/Makefile.am
@@ -21,7 +21,7 @@ AM_CFLAGS = $(XCFLAGS)
 AM_CXXFLAGS = $(XCFLAGS) -std=gnu++0x -funwind-tables -fno-exceptions \
 	-fno-rtti $(abi_version)
 AM_CCASFLAGS = $(XCFLAGS)
-AM_LDFLAGS = $(XLDFLAGS) $(SECTION_LDFLAGS) $(OPT_LDFLAGS)
+AM_LDFLAGS = $(XLDFLAGS) $(SECTION_LDFLAGS) $(OPT_LDFLAGS) $(HWCAP_LDFLAGS)
 
 toolexeclib_LTLIBRARIES = libitm.la
 nodist_toolexeclib_HEADERS = libitm.spec
diff --git a/libitm/Makefile.in b/libitm/Makefile.in
index 20961095e37..22baeb8de85 100644
--- a/libitm/Makefile.in
+++ b/libitm/Makefile.in
@@ -241,6 +241,7 @@ EGREP = @EGREP@
 EXEEXT = @EXEEXT@
 FGREP = @FGREP@
 GREP = @GREP@
+HWCAP_LDFLAGS = @HWCAP_LDFLAGS@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
@@ -359,7 +360,7 @@ AM_CXXFLAGS = $(XCFLAGS) -std=gnu++0x -funwind-tables -fno-exceptions \
 	-fno-rtti $(abi_version)
 
 AM_CCASFLAGS = $(XCFLAGS)
-AM_LDFLAGS = $(XLDFLAGS) $(SECTION_LDFLAGS) $(OPT_LDFLAGS)
+AM_LDFLAGS = $(XLDFLAGS) $(SECTION_LDFLAGS) $(OPT_LDFLAGS) $(HWCAP_LDFLAGS)
 toolexeclib_LTLIBRARIES = libitm.la
 nodist_toolexeclib_HEADERS = libitm.spec
 @LIBITM_BUILD_VERSIONED_SHLIB_FALSE@libitm_version_script = 
diff --git a/libitm/acinclude.m4 b/libitm/acinclude.m4
index 069738d8e80..1031f1f12c8 100644
--- a/libitm/acinclude.m4
+++ b/libitm/acinclude.m4
@@ -261,6 +261,36 @@ AC_DEFUN([LIBITM_CHECK_LINKER_FEATURES], [
 
 
 dnl
+dnl Check if the linker used supports linker maps to clear hardware
+dnl capabilities.  This is only supported by Sun ld at the moment.
+dnl
+dnl Defines:
+dnl  HWCAP_LDFLAGS='-Wl,-M,clearcap.map' if possible
+dnl  LD (as a side effect of testing)
+dnl
+AC_DEFUN([LIBITM_CHECK_LINKER_HWCAP], [
+  test -z "$HWCAP_LDFLAGS" && HWCAP_LDFLAGS=''
+  AC_REQUIRE([AC_PROG_LD])
+
+  ac_save_LDFLAGS="$LDFLAGS"
+  LDFLAGS="$LFLAGS -Wl,-M,$srcdir/clearcap.map"
+
+  AC_MSG_CHECKING([for ld that supports -Wl,-M,mapfile])
+  AC_TRY_LINK([], [return 0;], [ac_hwcap_ldflags=yes],[ac_hwcap_ldflags=no])
+  if test "$ac_hwcap_ldflags" = "yes"; then
+    HWCAP_LDFLAGS="-Wl,-M,$srcdir/clearcap.map $HWCAP_LDFLAGS"
+  fi
+  AC_MSG_RESULT($ac_hwcap_ldflags)
+
+  LDFLAGS="$ac_save_LDFLAGS"
+
+  AC_SUBST(HWCAP_LDFLAGS)
+
+  AM_CONDITIONAL(HAVE_HWCAP, test $ac_hwcap_ldflags != no)
+])
+
+
+dnl
 dnl Add version tags to symbols in shared library (or not), additionally
 dnl marking other symbols as private/local (or not).
 dnl
diff --git a/libitm/clearcap.map b/libitm/clearcap.map
new file mode 100644
index 00000000000..bd8189b43ff
--- /dev/null
+++ b/libitm/clearcap.map
@@ -0,0 +1,14 @@
+# Clear hardware capabilities emitted by Sun as: calls to the x86_avx.c
+# functions are only emitted with -mavx.
+#
+# The v1 mapfile syntax has no support for clearing specific capabilities,
+# so clear everything.
+#
+hwcap_1 = V0x0 OVERRIDE;
+#
+# If we can assume mapfile v2 syntax, we can specificially clear AVX.
+#
+#$mapfile_version 2
+#CAPABILITY {
+#	HW -= AVX;
+#};
diff --git a/libitm/configure b/libitm/configure
index 3abc7930e20..5fc8703cd9c 100644
--- a/libitm/configure
+++ b/libitm/configure
@@ -621,6 +621,9 @@ LIBITM_BUILD_VERSIONED_SHLIB_FALSE
 LIBITM_BUILD_VERSIONED_SHLIB_TRUE
 OPT_LDFLAGS
 SECTION_LDFLAGS
+HAVE_HWCAP_FALSE
+HAVE_HWCAP_TRUE
+HWCAP_LDFLAGS
 libtool_VERSION
 MAINT
 MAINTAINER_MODE_FALSE
@@ -2225,6 +2228,51 @@ rm -f conftest.val
   return $ac_retval
 
 } # ac_fn_c_compute_int
+
+# ac_fn_c_check_decl LINENO SYMBOL VAR
+# ------------------------------------
+# Tests whether SYMBOL is declared, setting cache variable VAR accordingly.
+ac_fn_c_check_decl ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  as_decl_name=`echo $2|sed 's/ *(.*//'`
+  as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
+$as_echo_n "checking whether $as_decl_name is declared... " >&6; }
+if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+int
+main ()
+{
+#ifndef $as_decl_name
+#ifdef __cplusplus
+  (void) $as_decl_use;
+#else
+  (void) $as_decl_name;
+#endif
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+
+} # ac_fn_c_check_decl
 cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
@@ -11722,7 +11770,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11725 "configure"
+#line 11773 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11828,7 +11876,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11831 "configure"
+#line 11879 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -16452,7 +16500,7 @@ $as_echo "#define HAVE_TLS 1" >>confdefs.h
 
   fi
 
-# See what sort of export controls are availible.
+# See what sort of export controls are available.
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the target supports hidden visibility" >&5
 $as_echo_n "checking whether the target supports hidden visibility... " >&6; }
@@ -16559,6 +16607,8 @@ $as_echo "#define HAVE_ATTRIBUTE_ALIAS 1" >>confdefs.h
 
   fi
 
+# Check linker hardware capability support.
+
 
 # Check whether --with-gnu-ld was given.
 if test "${with_gnu_ld+set}" = set; then :
@@ -16669,6 +16719,59 @@ with_gnu_ld=$lt_cv_prog_gnu_ld
 
 
 
+  test -z "$HWCAP_LDFLAGS" && HWCAP_LDFLAGS=''
+
+
+  ac_save_LDFLAGS="$LDFLAGS"
+  LDFLAGS="$LFLAGS -Wl,-M,$srcdir/clearcap.map"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ld that supports -Wl,-M,mapfile" >&5
+$as_echo_n "checking for ld that supports -Wl,-M,mapfile... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_hwcap_ldflags=yes
+else
+  ac_hwcap_ldflags=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+  if test "$ac_hwcap_ldflags" = "yes"; then
+    HWCAP_LDFLAGS="-Wl,-M,$srcdir/clearcap.map $HWCAP_LDFLAGS"
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_hwcap_ldflags" >&5
+$as_echo "$ac_hwcap_ldflags" >&6; }
+
+  LDFLAGS="$ac_save_LDFLAGS"
+
+
+
+   if test $ac_hwcap_ldflags != no; then
+  HAVE_HWCAP_TRUE=
+  HAVE_HWCAP_FALSE='#'
+else
+  HAVE_HWCAP_TRUE='#'
+  HAVE_HWCAP_FALSE=
+fi
+
+
+# If defaulting to -mavx, don't clear hwcaps.
+ac_fn_c_check_decl "$LINENO" "__AVX__" "ac_cv_have_decl___AVX__" "$ac_includes_default"
+if test "x$ac_cv_have_decl___AVX__" = x""yes; then :
+  HWCAP_LDFLAGS=''
+fi
+
+
+
   # If we're not using GNU ld, then there's no point in even trying these
   # tests.  Check for that first.  We should have already tested for gld
   # by now (in libtool), but require it now just to be safe...
@@ -16964,7 +17067,6 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: versioning on shared library symbols is $enable_symvers" >&5
 $as_echo "$as_me: versioning on shared library symbols is $enable_symvers" >&6;}
 
-
 if test $enable_symvers = gnu; then
 
 $as_echo "#define LIBITM_GNU_SYMBOL_VERSIONING 1" >>confdefs.h
@@ -17540,6 +17642,10 @@ if test -z "${MAINTAINER_MODE_TRUE}" && test -z "${MAINTAINER_MODE_FALSE}"; then
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
 
+if test -z "${HAVE_HWCAP_TRUE}" && test -z "${HAVE_HWCAP_FALSE}"; then
+  as_fn_error "conditional \"HAVE_HWCAP\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${LIBITM_BUILD_VERSIONED_SHLIB_TRUE}" && test -z "${LIBITM_BUILD_VERSIONED_SHLIB_FALSE}"; then
   as_fn_error "conditional \"LIBITM_BUILD_VERSIONED_SHLIB\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
diff --git a/libitm/configure.ac b/libitm/configure.ac
index ab2a90b7cf9..7b54371fa88 100644
--- a/libitm/configure.ac
+++ b/libitm/configure.ac
@@ -1,5 +1,5 @@
 # Process this file with autoreconf to produce a configure script.
-#   Copyright (C) 2011 Free Software Foundation, Inc.
+#   Copyright (C) 2011, 2012 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -208,12 +208,17 @@ GCC_LINUX_FUTEX(:)
 # See if we support thread-local storage.
 GCC_CHECK_TLS
 
-# See what sort of export controls are availible.
+# See what sort of export controls are available.
 LIBITM_CHECK_ATTRIBUTE_VISIBILITY
 LIBITM_CHECK_ATTRIBUTE_DLLEXPORT
 LIBITM_CHECK_ATTRIBUTE_ALIAS
-LIBITM_ENABLE_SYMVERS
 
+# Check linker hardware capability support.
+LIBITM_CHECK_LINKER_HWCAP
+# If defaulting to -mavx, don't clear hwcaps.
+AC_CHECK_DECL([__AVX__], [HWCAP_LDFLAGS=''])
+
+LIBITM_ENABLE_SYMVERS
 if test $enable_symvers = gnu; then
   AC_DEFINE(LIBITM_GNU_SYMBOL_VERSIONING, 1,
 	    [Define to 1 if GNU symbol versioning is used for libitm.])
diff --git a/libitm/testsuite/Makefile.in b/libitm/testsuite/Makefile.in
index 8066a2a0388..094e44de51a 100644
--- a/libitm/testsuite/Makefile.in
+++ b/libitm/testsuite/Makefile.in
@@ -95,6 +95,7 @@ EGREP = @EGREP@
 EXEEXT = @EXEEXT@
 FGREP = @FGREP@
 GREP = @GREP@
+HWCAP_LDFLAGS = @HWCAP_LDFLAGS@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@