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Subject[PATCH] kbuild: Fix compilation error
Date
From: Rong Tao <rongtao@cestc.cn>

In the absence of a CONFIG_FUNCTION_ALIGNMENT defined, -falign-functions=
will be given a null value, which results in a compilation error, as
follows:

$ make -C samples/bpf/
...
CC /home/sdb/Git/linux/samples/bpf/syscall_nrs.s
gcc: error: missing argument to ‘-falign-functions=’
make[2]: *** [scripts/Makefile.build:118: /home/sdb/Git/linux/samples
/bpf/syscall_nrs.s] Error 1
make[1]: *** [Makefile:1996: /home/sdb/Git/linux/samples/bpf] Error 2
make[1]: Leaving directory '/home/sdb/Git/linux'
make: *** [Makefile:269: all] Error 2

Signed-off-by: Rong Tao <rongtao@cestc.cn>
---
Makefile | 2 ++
1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 6aa709df6bde..57cce4c8f8a2 100644
--- a/Makefile
+++ b/Makefile
@@ -1006,9 +1006,11 @@ KBUILD_CFLAGS += $(CC_FLAGS_CFI)
export CC_FLAGS_CFI
endif

+ifdef CONFIG_FUNCTION_ALIGNMENT
ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
endif
+endif

# arch Makefile may override CC so keep this after arch Makefile is included
NOSTDINC_FLAGS += -nostdinc
--
2.38.1
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