Merge branch '2021-05-24-add-lto-support'

- Add LTO (link time optimization) support to the build system and
  enable it on a few boards.  This is an alternative to using
  -ffunction-sections/-fdata-sections and --gc-sections at link time to
  remove unused code.  This can result in notable savings, but needs
  testing on each platform before use as it can expose problems by
  optimizing away various functionally necessary calls.

1 files changed, 5 insertions, 4 deletions

diff --git a/lib/string.c b/lib/string.c
index a0cff8fe88e..ba176fb08f7 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -16,6 +16,7 @@
  */
 
 #include <config.h>
+#include <linux/compiler.h>
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
@@ -513,7 +514,7 @@ char *strswab(const char *s)
  *
  * Do not use memset() to access IO space, use memset_io() instead.
  */
-void * memset(void * s,int c,size_t count)
+__used void * memset(void * s,int c,size_t count)
 {
 	unsigned long *sl = (unsigned long *) s;
 	char *s8;
@@ -552,7 +553,7 @@ void * memset(void * s,int c,size_t count)
  * You should not use this function to access IO space, use memcpy_toio()
  * or memcpy_fromio() instead.
  */
-void * memcpy(void *dest, const void *src, size_t count)
+__used void * memcpy(void *dest, const void *src, size_t count)
 {
 	unsigned long *dl = (unsigned long *)dest, *sl = (unsigned long *)src;
 	char *d8, *s8;
@@ -586,7 +587,7 @@ void * memcpy(void *dest, const void *src, size_t count)
  *
  * Unlike memcpy(), memmove() copes with overlapping areas.
  */
-void * memmove(void * dest,const void *src,size_t count)
+__used void * memmove(void * dest,const void *src,size_t count)
 {
 	char *tmp, *s;
 
@@ -622,7 +623,7 @@ void * memmove(void * dest,const void *src,size_t count)
  * @ct: Another area of memory
  * @count: The size of the area.
  */
-int memcmp(const void * cs,const void * ct,size_t count)
+__used int memcmp(const void * cs,const void * ct,size_t count)
 {
 	const unsigned char *su1, *su2;
 	int res = 0;