[PATCH kvmtool 0/1] Don't empty CFLAGS in Makefile for static building

[Yao Yuan <yaoyuan@linux.alibaba.com>]

Don't set the CFLAGS to empty in Makefile for passing more
CFLAGS options from environment variable, e.g -static for
native static building.

One use case of static buidling is using kvmtool for
pre-silicon validation on emulation system, such system has
limited or even no IO part and run w/ small solo ramdisk as
linux userspace instead of full Linux distribution, and run
in slow speed. Thus the self-contained kvmtool static
building is good choice in performance and size for testing
on such system.

The static building is verified on arm64 host:

CFLAGS=-static make -j32
...
LINK     lkvm
LN       vm

$ldd ./lkvm
        not a dynamic executable

The funciton is verified w/ below command, boot arm64 guest
to serial successfully:

cmdline=(
	ignore_loglevel
	earlycon=uart8250,mmio,0x1000000,115200n8
	console=uart8250,mmio,0x1000000,115200n8
	nokaslr
	selinux=0
	audit=0
	root=/dev/vda3
)

./lkvm run \
	   --name test_kvmtool \
	   -c 4 -m 1G \
	   --nodefaults \
	   --irqchip gicv3-its \
	   --console serial \
	   --virtio-transport pci \
	   --disk /path/to/the/disk/image
	   --kernel /path/to/the/arm64/boot/image
	   --param "${cmdline[*]}"


Yao Yuan (1):
  Makefile: Don't set -CFLAGS := in Makefile

 Makefile | 1 -
 1 file changed, 1 deletion(-)

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2.43.5