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

2 files changed, 2 insertions, 0 deletions

diff --git a/compiler-rt/SDKs/linux/usr/include/stdio.h b/compiler-rt/SDKs/linux/usr/include/stdio.h
index 7c258d2aca1..0ca10fabea8 100644
--- a/compiler-rt/SDKs/linux/usr/include/stdio.h
+++ b/compiler-rt/SDKs/linux/usr/include/stdio.h
@@ -38,5 +38,6 @@ extern size_t fwrite(const void * restrict, size_t, size_t, FILE * restrict);
 extern size_t fread(void * restrict, size_t, size_t, FILE * restrict);
 extern long ftell(FILE *);
 extern int fseek(FILE *, long, int);
+extern void setbuf(FILE * restrict, char * restrict);
 
 #endif /* __STDIO_H__ */
diff --git a/compiler-rt/SDKs/linux/usr/include/string.h b/compiler-rt/SDKs/linux/usr/include/string.h
index bee9d46cddc..c7da1f57ba5 100644
--- a/compiler-rt/SDKs/linux/usr/include/string.h
+++ b/compiler-rt/SDKs/linux/usr/include/string.h
@@ -21,6 +21,7 @@ typedef __SIZE_TYPE__ size_t;
 
 int memcmp(const void *, const void *, size_t);
 void *memcpy(void *, const void *, size_t);
+void *memset(void *, int, size_t);
 char *strcat(char *, const char *);
 char *strcpy(char *, const char *);
 char *strdup(const char *);