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We don't list dtrace in DEPENDS so we shouldn't be depending on this header. 
It may or may not exist from preivous builds though. To be determinstic, disable
sdt.h usage always. This avoids build failures if the header is removed after configure
but before libgcc is compiled for example.

RP 2012/8/7

Upstream-Status: Inappropriate [hack]
---
 gcc/configure    | 12 ++++++------
 gcc/configure.ac | 18 +++++++++---------
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/gcc/configure b/gcc/configure
--- a/gcc/configure
+++ b/gcc/configure
@@ -26817,12 +26817,12 @@ fi
 { $as_echo "$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
+#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; }
 
diff --git a/gcc/configure.ac b/gcc/configure.ac
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -4688,15 +4688,15 @@ if test x$gcc_cv_libc_provides_ssp = xyes; then
 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)
+#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
-- 
1.8.3.1