Add configure checking for pread(2) and use it to save a syscall when reading files.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145061 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index 09173d2..bfd61dd 100755
--- a/configure
+++ b/configure
@@ -17151,7 +17151,8 @@
-for ac_func in mktemp posix_spawn realpath sbrk setrlimit strdup
+
+for ac_func in mktemp posix_spawn pread realpath sbrk setrlimit strdup
do
as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
{ echo "$as_me:$LINENO: checking for $ac_func" >&5