Sync config/warnings.m4 with GCC

config/

	Sync with GCC
	2015-05-27  Jason Merrill  <jason@redhat.com>

	PR bootstrap/66304
	* warnings.m4 (ACX_PROG_CXX_WARNING_OPTS)
	(ACX_PROG_CXX_WARNINGS_ARE_ERRORS)
	(ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC): New.
	(ACX_PROG_CC_WARNING_OPTS, ACX_PROG_CC_WARNING_ALMOST_PEDANTIC)
	(ACX_PROG_CC_WARNINGS_ARE_ERRORS): Push into C language context.

libdecnumber/

	* configure: Regenerated.

libiberty/

	* configure: Regenerated.

opcodes/

	* configure: Regenerated.

8 files changed, 207 insertions, 1 deletions

diff --git a/config/ChangeLog b/config/ChangeLog
index 17b45cd232..7c6e3e0121 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,6 +1,18 @@
 2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
 
 	Sync with GCC
+	2015-05-27  Jason Merrill  <jason@redhat.com>
+
+	PR bootstrap/66304
+	* warnings.m4 (ACX_PROG_CXX_WARNING_OPTS)
+	(ACX_PROG_CXX_WARNINGS_ARE_ERRORS)
+	(ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC): New.
+	(ACX_PROG_CC_WARNING_OPTS, ACX_PROG_CC_WARNING_ALMOST_PEDANTIC)
+	(ACX_PROG_CC_WARNINGS_ARE_ERRORS): Push into C language context.
+
+2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	Sync with GCC
 	* mh-alpha-linux: Restored.
 
 2015-06-30  H.J. Lu  <hongjiu.lu@intel.com>
diff --git a/config/warnings.m4 b/config/warnings.m4
index b64b594e62..ce007f9b73 100644
--- a/config/warnings.m4
+++ b/config/warnings.m4
@@ -18,11 +18,12 @@
 #along with GCC; see the file COPYING3.  If not see
 #<http://www.gnu.org/licenses/>.
 
-# ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS)
+# ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS])
 #   Sets @VARIABLE@ to the subset of the given options which the
 #   compiler accepts.
 AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],
 [AC_REQUIRE([AC_PROG_CC])dnl
+AC_LANG_PUSH(C)
 m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl
 AC_SUBST(acx_Var)dnl
 m4_expand_once([acx_Var=
@@ -48,6 +49,7 @@ for real_option in $1; do
 done
 CFLAGS="$save_CFLAGS"
 m4_popdef([acx_Var])dnl
+AC_LANG_POP(C)
 ])# ACX_PROG_CC_WARNING_OPTS
 
 # ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC])
@@ -55,6 +57,7 @@ m4_popdef([acx_Var])dnl
 #   and accepts all of those options simultaneously, otherwise to nothing.
 AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC],
 [AC_REQUIRE([AC_PROG_CC])dnl
+AC_LANG_PUSH(C)
 m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl
 AC_SUBST(acx_Var)dnl
 m4_expand_once([acx_Var=
@@ -77,6 +80,7 @@ AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
 AS_VAR_POPDEF([acx_Pedantic])dnl
 m4_popdef([acx_Woptions])dnl
 m4_popdef([acx_Var])dnl
+AC_LANG_POP(C)
 ])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC
 
 # ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR])
@@ -88,6 +92,7 @@ m4_popdef([acx_Var])dnl
 #   appeared on the configure command line.
 AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS],
 [AC_REQUIRE([AC_PROG_CC])dnl
+AC_LANG_PUSH(C)
 m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl
 AC_SUBST(acx_Var)dnl
 m4_expand_once([acx_Var=
@@ -114,4 +119,109 @@ AS_IF([test $enable_werror_always = yes],
        [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
   AS_VAR_POPDEF([acx_GCCvers])])
 m4_popdef([acx_Var])dnl
+AC_LANG_POP(C)
 ])# ACX_PROG_CC_WARNINGS_ARE_ERRORS
+
+# ACX_PROG_CXX_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CXXFLAGS])
+#   Sets @VARIABLE@ to the subset of the given options which the
+#   compiler accepts.
+AC_DEFUN([ACX_PROG_CXX_WARNING_OPTS],
+[AC_REQUIRE([AC_PROG_CXX])dnl
+AC_LANG_PUSH(C++)
+m4_pushdef([acx_Var], [m4_default([$2], [WARN_CXXFLAGS])])dnl
+AC_SUBST(acx_Var)dnl
+m4_expand_once([acx_Var=
+],m4_quote(acx_Var=))dnl
+save_CXXFLAGS="$CXXFLAGS"
+for real_option in $1; do
+  # Do the check with the no- prefix removed since gcc silently
+  # accepts any -Wno-* option on purpose
+  case $real_option in
+    -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
+    *) option=$real_option ;;
+  esac
+  AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
+  AC_CACHE_CHECK([whether $CXX supports $option], acx_Woption,
+    [CXXFLAGS="$option"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
+      [AS_VAR_SET(acx_Woption, yes)],
+      [AS_VAR_SET(acx_Woption, no)])
+  ])
+  AS_IF([test AS_VAR_GET(acx_Woption) = yes],
+        [acx_Var="$acx_Var${acx_Var:+ }$real_option"])
+  AS_VAR_POPDEF([acx_Woption])dnl
+done
+CXXFLAGS="$save_CXXFLAGS"
+m4_popdef([acx_Var])dnl
+AC_LANG_POP(C++)
+])# ACX_PROG_CXX_WARNING_OPTS
+
+# ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC])
+#   Append to VARIABLE "-pedantic" + the argument, if the compiler is G++
+#   and accepts all of those options simultaneously, otherwise to nothing.
+AC_DEFUN([ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC],
+[AC_REQUIRE([AC_PROG_CXX])dnl
+AC_LANG_PUSH(C++)
+m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl
+AC_SUBST(acx_Var)dnl
+m4_expand_once([acx_Var=
+],m4_quote(acx_Var=))dnl
+# Do the check with the no- prefix removed from the warning options
+# since gcc silently accepts any -Wno-* option on purpose
+m4_pushdef([acx_Woptions], [m4_bpatsubst([$1], [-Wno-], [-W])])dnl
+AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_]acx_Woptions)dnl
+AS_IF([test "$GXX" = yes],
+[AC_CACHE_CHECK([whether $CXX supports -pedantic ]acx_Woptions, acx_Pedantic,
+[save_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="-pedantic acx_Woptions"
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
+   [AS_VAR_SET(acx_Pedantic, yes)],
+   [AS_VAR_SET(acx_Pedantic, no)])
+CXXFLAGS="$save_CXXFLAGS"])
+AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
+      [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"])
+])
+AS_VAR_POPDEF([acx_Pedantic])dnl
+m4_popdef([acx_Woptions])dnl
+m4_popdef([acx_Var])dnl
+AC_LANG_POP(C++)
+])# ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC
+
+# ACX_PROG_CXX_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR])
+#   sets @VARIABLE@ to "-Werror" if the compiler is G++ >=x.y.z, or if
+#   --enable-werror-always was given on the command line, otherwise
+#   to nothing.
+#   If the argument is the word "manual" instead of a version number,
+#   then @VARIABLE@ will be set to -Werror only if --enable-werror-always
+#   appeared on the configure command line.
+AC_DEFUN([ACX_PROG_CXX_WARNINGS_ARE_ERRORS],
+[AC_REQUIRE([AC_PROG_CXX])dnl
+AC_LANG_PUSH(C++)
+m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl
+AC_SUBST(acx_Var)dnl
+m4_expand_once([acx_Var=
+],m4_quote(acx_Var=))dnl
+AC_ARG_ENABLE(werror-always,
+    AS_HELP_STRING([--enable-werror-always],
+		   [enable -Werror despite compiler version]),
+[], [enable_werror_always=no])
+AS_IF([test $enable_werror_always = yes],
+      [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
+ m4_if($1, [manual],,
+ [AS_VAR_PUSHDEF([acx_GXXvers], [acx_cv_prog_cxx_gxx_$1_or_newer])dnl
+  AC_CACHE_CHECK([whether $CXX is G++ >=$1], acx_GXXvers,
+    [set fnord `echo $1 | tr '.' ' '`
+     shift
+     AC_PREPROC_IFELSE(
+[#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \
+  < [$]1 * 10000 + [$]2 * 100 + [$]3
+#error insufficient
+#endif],
+   [AS_VAR_SET(acx_GXXvers, yes)],
+   [AS_VAR_SET(acx_GXXvers, no)])])
+ AS_IF([test AS_VAR_GET(acx_GXXvers) = yes],
+       [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
+  AS_VAR_POPDEF([acx_GXXvers])])
+m4_popdef([acx_Var])dnl
+AC_LANG_POP(C++)
+])# ACX_PROG_CXX_WARNINGS_ARE_ERRORS
diff --git a/libdecnumber/ChangeLog b/libdecnumber/ChangeLog
index 4e03eb084d..e0f230033a 100644
--- a/libdecnumber/ChangeLog
+++ b/libdecnumber/ChangeLog
@@ -1,3 +1,7 @@
+2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* configure: Regenerated.
+
 2015-06-30  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* configure: Regenerated.
diff --git a/libdecnumber/configure b/libdecnumber/configure
index 964837d28a..35baf0798b 100755
--- a/libdecnumber/configure
+++ b/libdecnumber/configure
@@ -3272,6 +3272,12 @@ test -n "$AUTOHEADER" || AUTOHEADER="$MISSING autoheader"
 # See config/warnings.m4 for details.
 
 
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 WARN_CFLAGS=
 save_CFLAGS="$CFLAGS"
 for real_option in -W -Wall -Wwrite-strings -Wstrict-prototypes \
@@ -3318,6 +3324,18 @@ $as_echo "$ac_res" >&6; }
 fi
   done
 CFLAGS="$save_CFLAGS"
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 WARN_PEDANTIC=
 # Do the check with the no- prefix removed from the warning options
@@ -3356,10 +3374,22 @@ if test $acx_cv_prog_cc_pedantic__Wlong_long = yes; then :
 fi
 
 fi
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 
 
 # Only enable with --enable-werror-always until existing warnings are
 # corrected.
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 WERROR=
 # Check whether --enable-werror-always was given.
 if test "${enable_werror_always+set}" = set; then :
@@ -3372,6 +3402,12 @@ if test $enable_werror_always = yes; then :
   WERROR="$WERROR${WERROR:+ }-Werror"
 fi
 
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 
 
 # Checks for header files.
diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index f2b014841a..9bddd2e640 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,7 @@
+2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* configure: Regenerated.
+
 2015-06-01  Jason Merrill  <jason@redhat.com>
 
 	* cp-demangle.c (cplus_demangle_type): Handle arguments to vendor
diff --git a/libiberty/configure b/libiberty/configure
index da2df4ec74..d8890a11de 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -4389,6 +4389,12 @@ fi
 
 ac_c_preproc_warn_flag=yes
 
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 ac_libiberty_warn_cflags=
 save_CFLAGS="$CFLAGS"
 for real_option in -W -Wall -Wwrite-strings -Wc++-compat \
@@ -4434,6 +4440,18 @@ $as_echo "$ac_res" >&6; }
 fi
   done
 CFLAGS="$save_CFLAGS"
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 # Do the check with the no- prefix removed from the warning options
 # since gcc silently accepts any -Wno-* option on purpose
@@ -4471,6 +4489,12 @@ if test $acx_cv_prog_cc_pedantic_ = yes; then :
 fi
 
 fi
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 
 
 if test "x$CC" != xcc; then
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 869033d5c4..7441bfda42 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,7 @@
+2015-07-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* configure: Regenerated.
+
 2015-07-03  Alan Modra  <amodra@gmail.com>
 
 	* ppc-opc.c (PPC750, PPC7450, PPC860): Define using PPC_OPCODE_*.
diff --git a/opcodes/configure b/opcodes/configure
index e5048e2fdc..28708792c8 100755
--- a/opcodes/configure
+++ b/opcodes/configure
@@ -11576,6 +11576,12 @@ fi
 
 
 
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 NO_WMISSING_FIELD_INITIALIZERS=
 save_CFLAGS="$CFLAGS"
 for real_option in -Wno-missing-field-initializers; do
@@ -11620,6 +11626,12 @@ $as_echo "$ac_res" >&6; }
 fi
   done
 CFLAGS="$save_CFLAGS"
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 
 
 ac_config_headers="$ac_config_headers config.h:config.in"