[PATCH v2 1/3] recipes-bsp/u-boot: fixup build for gcc7

[ayaka <ayaka@soulik.info>]

From: Randy 'ayaka' Li <ayaka@soulik.info>

Signed-off-by: Randy Li <randy.li@rock-chips.com>
Signed-off-by: Randy 'ayaka' Li <ayaka@soulik.info>
---
 .../u-boot/u-boot-rockchip/gcc7_fixup.patch   | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 recipes-bsp/u-boot/u-boot-rockchip/gcc7_fixup.patch

diff --git a/recipes-bsp/u-boot/u-boot-rockchip/gcc7_fixup.patch b/recipes-bsp/u-boot/u-boot-rockchip/gcc7_fixup.patch
new file mode 100644
index 0000000..ccb709a
--- /dev/null
+++ b/recipes-bsp/u-boot/u-boot-rockchip/gcc7_fixup.patch
@@ -0,0 +1,38 @@
+diff --git a/include/linux/log2.h b/include/linux/log2.h
+index aa1de63090..5526af036d 100644
+--- a/include/linux/log2.h
++++ b/include/linux/log2.h
+@@ -12,12 +12,6 @@
+ #include <linux/types.h>
+ #include <linux/bitops.h>
+ 
+-/*
+- * deal with unrepresentable constant logarithms
+- */
+-extern __attribute__((const, noreturn))
+-int ____ilog2_NaN(void);
+-
+ /*
+  * non-constant log of base 2 calculators
+  * - the arch may override these in asm/bitops.h if they can be implemented
+@@ -82,7 +76,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
+ #define ilog2(n)				\
+ (						\
+ 	__builtin_constant_p(n) ? (		\
+-		(n) < 1 ? ____ilog2_NaN() :	\
++		(n) < 2 ? 0 :			\
+ 		(n) & (1ULL << 63) ? 63 :	\
+ 		(n) & (1ULL << 62) ? 62 :	\
+ 		(n) & (1ULL << 61) ? 61 :	\
+@@ -145,10 +139,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
+ 		(n) & (1ULL <<  4) ?  4 :	\
+ 		(n) & (1ULL <<  3) ?  3 :	\
+ 		(n) & (1ULL <<  2) ?  2 :	\
+-		(n) & (1ULL <<  1) ?  1 :	\
+-		(n) & (1ULL <<  0) ?  0 :	\
+-		____ilog2_NaN()			\
+-				   ) :		\
++		1 ) :				\
+ 	(sizeof(n) <= 4) ?			\
+ 	__ilog2_u32(n) :			\
+ 	__ilog2_u64(n)				\
-- 
2.21.0