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

[Alexandru Elisei <alexandru.elisei@arm.com>]

Hi,

On Mon, Aug 17, 2026 at 04:45:33PM +0800, Yao Yuan wrote:
> Don't set the CFLAGS to empty in Makefile for passing more
> CFLAGS options from environment variable, e.g -static for
> native static building.

I think the lkvm-static makefile target might be your friend in this case :)

$ make -j$(getconf _NPROCESSORS_ONLN) ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- lkvm-static

(have a look at the $(PROGRAM)-static target if you want to double check that it
fits your needs)

Thanks,
Alex

> 
> 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(-)
> 
> --
> 2.43.5
>