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

1 files changed, 2 insertions, 1 deletions

diff --git a/configure b/configure
index 09173d257f..bfd61dd5e3 100755
--- a/configure
+++ b/configure
@@ -17151,7 +17151,8 @@ done
 
 
 
-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