Try to improve performance by using a read/write buffer instead of I/O.

The calls to fwrite/fread can be very expensive. GCC avoids this by using a
buffer to read and write from the file, thus limiting the number of fwrite/fread
calls.

<rdar://problem/13466086>

llvm-svn: 181924

1 files changed, 1 insertions, 0 deletions

diff --git a/compiler-rt/SDKs/darwin/usr/include/stdio.h b/compiler-rt/SDKs/darwin/usr/include/stdio.h
index 63b10a86b63..5bbd8a55bf3 100644
--- a/compiler-rt/SDKs/darwin/usr/include/stdio.h
+++ b/compiler-rt/SDKs/darwin/usr/include/stdio.h
@@ -74,6 +74,7 @@ size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict)
 size_t fread(void * __restrict, size_t, size_t, FILE * __restrict);
 long ftell(FILE *);
 int fseek(FILE *, long, int);
+void setbuf(FILE * __restrict, char * __restrict);
 
 int snprintf(char * __restrict, size_t, const char * __restrict, ...);