Check sys/sdt.h with AC_CHECK_HEADERS

The original patch was backported to gcc 4.7.2!

see: http://patchwork.ozlabs.org/patch/207141/ for the original patch
------------------------------------------------------------------------------
2012-12-18  Christian Bruel  <christian.bruel@st.com>

	* configure.ac: Check sys/sdt.h with AC_CHECK_HEADERS.
	* configure: Regenerate.
	* config.in: Regenerat.e
------------------------------------------------------------------------------

--- a/gcc/configure
+++ b/gcc/configure
@@ -8286,7 +8286,7 @@ fi
 
 for ac_header in limits.h stddef.h string.h strings.h stdlib.h time.h iconv.h \
 		 fcntl.h unistd.h sys/file.h sys/time.h sys/mman.h \
-		 sys/resource.h sys/param.h sys/times.h sys/stat.h \
+		 sys/resource.h sys/param.h sys/times.h sys/sdt.h sys/stat.h \
 		 direct.h malloc.h langinfo.h ldfcn.h locale.h wchar.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
@@ -26716,20 +26716,6 @@ $as_echo "#define TARGET_LIBC_PROVIDES_SSP 1" >>co
 
 fi
 
-# Test for <sys/sdt.h> on the target.
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking sys/sdt.h in the target C library" >&5
-$as_echo_n "checking sys/sdt.h in the target C library... " >&6; }
-have_sys_sdt_h=no
-if test -f $target_header_dir/sys/sdt.h; then
-  have_sys_sdt_h=yes
-
-$as_echo "#define HAVE_SYS_SDT_H 1" >>confdefs.h
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_sys_sdt_h" >&5
-$as_echo "$have_sys_sdt_h" >&6; }
-
 # Check if TFmode long double should be used by default or not.
 # Some glibc targets used DFmode long double, but with glibc 2.4
 # and later they can use TFmode.
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -940,7 +940,7 @@ ACX_HEADER_STRING
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS(limits.h stddef.h string.h strings.h stdlib.h time.h iconv.h \
 		 fcntl.h unistd.h sys/file.h sys/time.h sys/mman.h \
-		 sys/resource.h sys/param.h sys/times.h sys/stat.h \
+		 sys/resource.h sys/param.h sys/times.h sys/sdt.h sys/stat.h \
 		 direct.h malloc.h langinfo.h ldfcn.h locale.h wchar.h)
 
 # Check for thread headers.
@@ -4718,17 +4718,6 @@ if test x$gcc_cv_libc_provides_ssp = xyes; then
 	    [Define if your target C library provides stack protector support])
 fi
 
-# Test for <sys/sdt.h> on the target.
-GCC_TARGET_TEMPLATE([HAVE_SYS_SDT_H])
-AC_MSG_CHECKING(sys/sdt.h in the target C library)
-have_sys_sdt_h=no
-if test -f $target_header_dir/sys/sdt.h; then
-  have_sys_sdt_h=yes
-  AC_DEFINE(HAVE_SYS_SDT_H, 1,
-            [Define if your target C library provides sys/sdt.h])
-fi
-AC_MSG_RESULT($have_sys_sdt_h)
-
 # Check if TFmode long double should be used by default or not.
 # Some glibc targets used DFmode long double, but with glibc 2.4
 # and later they can use TFmode.
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -465,6 +465,12 @@
 #endif
 
 
+/* Define if your assembler supports SPARC4 instructions. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_SPARC4
+#endif
+
+
 /* Define if your assembler and linker support GOTDATA_OP relocs. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_SPARC_GOTDATA_OP
@@ -1210,7 +1216,7 @@
 #endif
 
 
-/* Define if your PowerPC64 linker supports a large TOC. */
+/* Define if your AIX linker supports a large TOC. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_LD_LARGE_TOC
 #endif
@@ -1447,7 +1453,10 @@
 
 
 /* Define if your target C library provides sys/sdt.h */
+#ifndef USED_FOR_TARGET
 #undef HAVE_SYS_SDT_H
+#endif
+
 
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #ifndef USED_FOR_TARGET